PHYLLOTAXIS OF KNIPHOFIA AND LILIUM CANDID UM
|
|
- Gavin Lyons
- 5 years ago
- Views:
Transcription
1 PHYLLOTAXIS OF KNIPHOFIA AND LILIUM CANDID UM BY R. SNOW Felloiv of Magdalen College, Oxford [Received 12 March 1957) (With Plate i and 8 figures in the text) KNIPHOFIA According to Berger (1908) the leaves in most species of Kniphofia are arranged in four ranks. In a few species they are arranged in three or five ranks and in one, K. northiae, spirally. But he figures only a section taken far above the stem apex through four ranks of leaves in iv, iivaria (syn. aloides). Troll (1937) figures a section of a bud of K. iivaria, taken only a little way above the stem apex, and from this section also it appears that the leaves in this species are in four ranks, and further that they form pairs of opposite members, the pairs being successively at right angles. It also appears that the leaves in each pair differ in size. But for certainty and for a more exact description one needs transections through the stem apex and the insertions of the youngest leaves. Since four-ranked phyllotaxis is uncommon in monocotyledons, it seemed of interest to study further the phyllotaxis of Kniphofia in sections of buds of various species. Most of the buds examined have been the terminal buds of seedlings from seed of K. uvaria and K. piimila, and the others were lateral buds growing out from the base of older plants of various species in early May. The genetic nature of the seedlings is uncertain, since Kniphofias hybridize readily, but no differences were noticed between the buds of those attributed to the two different species. Some sections were cut free-hand after embedding in collodion, including those shown in Figs. 1,5,6 and some, for which I am indebted to my wife, with a microtome after embedding in paraffin, I am also much indebted to Dr. F. A. L. Clowes for the micro-photographs. The seedlings are all at first distichous. Sections of a young distichous seedling of K. uvaria, about 2 months old, are shown in Fig. i, a and b. Each leaf forms a complete sheath round the apex, as is usual in the Aloinae, and in Fig. 1,6, it can be seen that the youngest leaf has already done so before the end of the plastochron. The sheaf of this leaf was not indeed yet free for the apex, but it could be clearly recognized from the cell pattern, its cells being clearly distinct from those of the stem apex. The parts of the sheaths on the far side of the apex or axis are at first very thin, only 2 or 3 cells thick, and they remain for some time very low, so that the sheaths of the youngest leaves are often seen complete in a few sections only. Fig, 2, a and b, shows a seedling of K. pitmila about three months old. The original distichy, still shown by leaves 5 to 8, has changed abruptly to the mature four-ranked arrangement, or tetrastichy, at leaf 4. A photograph of this apex is shown in Plate 2, a. A lateral bud from the base of an old plant, probably of K. itvaria, with leaves in four ranks is shown in Fig. 3, At this stage of the plastochron, leaf i has nearly, but not quite, formed a sheath round the apex. Leaves 2 to 4 are cut above their sheaths, and outside leaf 4 the section has passed into the axis, which in buds of old plants is bowl-shaped, 160
2 Phyllotaxis of Kniphofia and Lilium candidum 3a Fig. I, a, b. A young seedling of Kniphofia iwaria, ax4 Fig. 2, a, b. An older seedling of K. pumila, a X 19, b X4 Fig. 3, a, c. Lateral bud of an old plant of K. uvaria, X 45. B N.P.
3 i62 R. SNOW A photograph is shown in Plate 2, b. In these buds, as in all the tetrastichous buds sanctioned, the leaves of each pair differ clearly in size and in level of insertion, and so presumably in age. In the bud shown in Fig. 3 the pairs are not quite at right angles. The seedlings do not all change directly from distichy to tetrastichy. In two seedlings of K. pitmila the early distichy was followed by an irregular spiral. Sections of the spiral part of one of these are shown in Fig. 4, a, b. The divergence angles in degrees from leaf 9 to leaf I (the youngest) were 170, 148, 134, 135, 137, 170, ioi. In the other seedling the angles from leaf 7 to leaf i were 163, 122, 129, 136, 152, 106. These two seedhngs were perhaps just turning to the normal tetrastichy with the youngest two leaves. An interesting point is that in tetrastichy the orientations of successive pairs of leaves may change in either of two ways. With one arrangement a line drawn through the centres of all the older leaves of each pair, or of all the younger ones, would form a spiral round the axis, as in Fig. 6, a, b, K. titbergeniana. With the other arrangement such a line would reverse its direction at each step, since all the older leaves of each pair are in two ranks on one side of the axis, and all the younger ones on the other side, as in Fig. 5, a, b, K. tysoni. This last arrangement was found in all the buds of K. uvaria and K. pttmila also, including the seedlings. The same two arrangements are well known it! the formation of other members, for instance lateral buds in some species with decussate phyllotaxis. The leaves of each pair in Kniphofia differ less in size, and presumably in age, than do the second leaf of a pair and the first leaf of the next. This is brought out clearly if one measures the radii from the centre of the apex or axis to a convenient point on each successive leaf, such as the centre of its outer or abaxial surface, and then calculates the ratios of every successive two radii. For example, in the bud of A', tvsoni shown in Fig. 5, these ratios, starting with that ofthe radii to the two youngest leaves, are the following: 0.47, 0.89, 0.57, 0.88, 0.72, 0.96, The second, fourth and sixth of these ratios are those of the radii to the leaves of a pair, and they are much closer to unity than the others. In the spiral part of the seedling of K. pumila shown in Fig. 4, from leaf 3 to leaf 7, the successive ratios are more nearly equal, being 0.71, 0.83, 0.77, The use of such ratios has been advocated by Richards (1948), who calls them 'plastochrone ratios'. He measures the radii to the morphological centres of leaves, but these in Kniphofia are not very sharply defitied. The outstanding peculiarity in the phyllotaxis of these species of Kniphofia is that the plane in which the leaves arise changes by a right angle after every second leaf, so that distichy is converted into tetrastichy. Troll (1937, p. 430) supposes that the apex twists through 90" after the formation of alternate leaves owing to an internal inherited cause. But this would surely be revealed by distortions of the apical cell pattern, and actually no such distortions are to be seen. Also in order to account for the two arrangements of successive leaf pairs described above, it would be necessary to suppose that in some species or some buds of Kniphofia the apex twists repeatedly in the same direction, and in other species in a direction that reverses every time. It seems to the writer improbable that there is any such difference between species or buds within one genus due directly to an inherited cause, and more probable that the difference between the two arrangements is brought about in some more itidirect way. As an alternative to Troll's theory, the following explanation may be suggested. In most species with apices that are elliptic in cross section when the new leaves are about
4 Phyllolaxis of Kniphofia and Lilium candidum 163 6a Fig. 4, a, b. A spiral bud of A', pumiln, a : ig, b x 55. Fig. 5, a, b. K. tysoni, a 22, b <55. Fig. 6, a, b. K. tubergeniana, a ^ 21, b >:5i.
5 164 R. SNOW to arise, these leaves arise at the narrow ends of the ellipse, as for instance in most decussate apices. In tetrastichous apices of Kniphofia when the last leaf formed has been the second leaf of a pair, the apex is very narrow in the plane in which the last two leaves have been formed, and much broader in the plane at right angles, as can be seen in Figs. 2 and 3, K. uvaria and K. pitmila. But when such an apex is forming the first leaf of a pair, it seems that it is broadest in the plane through the centre of this leaf (Figs. 5 and 6, K. tysoni and K. tubergeniana). In the early distichous phase, it seems that the apex is more nearly circular (Fig. 1). So it may be that in the tetrastichous apices the new leaves encroach on the apex so much that after the formation of each pair the apex is left very narrow in the plane through their centres, and consequently the next pair is formed from the narrow ends of the roughly elliptic apex in the plane at right angles. Weisse (1894, p. 285) considered that a similar periodic change of shape helps to regularize the phyllotaxis of decussate apices. But the present problem does not arise with regard to decussates, since they are at no time distichous, their leaf insertions being too small. It is of interest that the phyllotaxis can be spiral in Kniphofia, as also it is in palms (Henri, 1955) in/?/iofo (Snow, M., i95i)andin various other plants in which the youngest leaves form complete sheaths. This seems at first a difficulty for a space-filling theory of phyllotaxis, such as the writer has taken part in supporting (1931, 1955). For on such a theory the spirals and other regular systems are due to a process in which the new leaves are fitted into the depressions between the central parts of the existing leaves round the stem apex. But there is some evidence that the bases of encircling leaf sheaths to some degree conform to the contour line formed by the oldest leaves below them, rising closer to the tip of the stem apex above the higher central parts of the leaves below, and sinking further away from it elsewhere. Such evidence has been found in Dipsacus (Snow, R., 1951, p. 306) and in Rhoeo (Snow, M., 1957, p. 57). When the leaf sheaths develop in this way they will not prevent the central parts of the new leaves from fitting into depressions of the contour line round the stem apex. Concerning the three-ranked and four-ranked phyllotaxis systems reported by Berger in Kniphofia, it will be wise to wait until their existence has been confirmed in bud sections LiLIUM CANDIDUM Lilium candidum is the first of the species upon which a new theory of phyllotaxis has been founded (Plantefol, ). The theory, which the writer has discussed elsewhere (1955) is in brief the following. It is supposed that a number of leaf-generating centres travel in parallel ascending helices round the stem apex, leaving behind them continuous paths consisting of the bases of the leaves which they have formed at regular intervals of time. These paths, or the infiuences forming them, are called foliar helices, and are often the same as what were previously called parastichies, being one of the two sets of parastichies that wind round the apex in opposite directions. The foliar helices are supposed to be usually three in monocotyledons, and their rhythmic leaf-forming activities are supposed to be co-ordinated by a cetitre at the tip of the stem apex. The phyllotaxis of Lilium candidum is considered to support this theory for the following reason. If on the mature stem one tries to trace a regular genetic spiral that is, a spiral through the leaf bases in their order of age - it is claimed that one cannot do so: for if one chooses leaves at about equal angular divergences round the stem, one finds that one is sometimes taking a higher leaf before a lower one. On the other hand, it is
6 Phyllotaxis of Kniphofia and Lilium candidum Figs. 7 and 8. Main buds of two bulbs of Lilium candidum, a, 64, b 'C 56.
7 i66 R. SNOW claimed that one can trace three fairly regular foliar helices, which in this species must be supposed not to be so co-ordinated exactly. But though this is a theory of the origin of leaves, their early positions in this species have not been observed, but only inferred from their later positions on the mature stem, a method which often leads to error. So in order to see the early positions, the writer has now cut sections of the buds. Bulbs of Lilium candidtun were started into growth in autumn, and when the shoots were about 1.5 cm. long to the tip of the stem, the terminal buds of four of them were flxed, embedded in collodion and sectioned freehand. Transections of two of them at the level of the youngest leaf, drawn under a projecting microscope, are illustrated in Figs, i and 2. The leaves are numbered along the genetic spiral. The bud shown in Fig. i has a very regular Fibonacci spiral phyllotaxis with contacts 3, 5 and 8, the contact 3 being only just reached. The leaves follow steadily along the genetic spiral, and the first ten divergence angles, from leaf o to leaf io, are 135, 136, 132, 136, 137, 137, 138, 134, 134, 136. The regularity of the pattern can also be appreciated by following the two conspicuous sets of intersecting curved parastichies, the five with leaf numbers differing by five, and the eight with numbers differing by eight. The bud shown in Fig. 2 has developed a little further, having a stem 1.71; cm. long, though it has not begun to form axillary flower-buds; and it has a higher phyllotaxis, the contacts being 8 and 13. It also is regular, except that it appears to be slightly eccentric, the leaves older than leaf six having grown a little more strongly on the right-hand half of the bud than on the left. The two sets of parastichies, the set of eight and the set of 13, run quite regularly, and the mean of the divergence angles from leaf i to leaf 35 is 137.2, or from 2 to 36, The other two buds sectioned had also regular Fibonacci spirals with contacts five and eight. It may be noted that in three of the four buds sectioned the young leaves did not make contact along the three curves with leaf-numbers differing by three, although according to Plantefol (1948, pp. 154, 194) it is an essential point that leaves are formed in contact along the foliar helices. An appearance of such contact on the mature stem may be due to later lateral extension of the leaf bases. Several other bulbs of the same batch were left to grow on and flower, and it was confirmed that they were indeed L. candidum. Naturally it remains possible that in some other race of this species the phyllotaxis of the young leaves of the bud may be irregular, but this is now very improbable, and unless it can be directly demonstrated, there are no grounds for supposing it. As to the nature of the irregularities described on the mature stem, these seem to be similar, though slighter, to those described by Schoute (1922) in various species, and called by him 'growth whorls'. He concluded that they were secondary irregularities in the levels of the leaves caused by unequal elongations of diflerent sectors of the stem. REFERENCES BERCER, otrcer, A. (iqos). (IC)OS). Aloinae. fpanzeiireich, Pflanzeiireich, 4, 38. HENRI, M. P. (1955). Organisation foliaur chez le piilmier palmier hiule. Rev, Gen, Bot,, 62, 127. PLANTEFOL, L. ( ). La Theorie dos Helices Foliariss Multiples. Ann. Sci. Nat. Bot. 7 and 8. (Also separately, Paris, Masson, 1948.') ' RICHARDS, F. J. (1948). The geometry of phyllotaxis. Symp. Soc, EX/T. Biol 2, 217 SCHOUTE, J. C. (1922). Growth Whorls. Rec, trav. bot. Neerl., 19, 184. SNOW, M. (1951). Experiments on spirodistichous shoot apices. Phil. Tram. Roy. Soc. Lond., B, 235, SNOW, M. (1955). Spirodistichy re-interpreted. Ibid., 239, 43.
8 PLATE I THE NEW PHYTOLOGIST, 57, 2 &^^^s^s SNOW W/17./,O7'.-JA7.S' Of' KNIPHOFIA LI MUM CANDIDUM cinri p. 167)
9 Phyllotaxis of Kniphofia and Lilium candidum 167 SNOW, M. B., SNOW, R. (1931). Experiments on phyllotaxis, part i. Ibid., 221, i. SNOW, R. (1951). Experiments on bijugate apices. Ibid., 235, 291. SNOW, R. (1955). Problems of phyllotaxis and leaf determination. Endeavour, 14, 190. TROLL, W. (1937). Vergleichende Morphologie der Hoheren Pflanzen, i. WEISSE, A. (1894). Neus Beitrage zur mechanischen Blattstellungslehre. Jahrb. wiss. Bot., 26, 236. LEGEND TO PLATE i Plate I, a. Same bud of Kniphofia pumila as text-fig. 2, x 102. b. Same bud of Kniphofia uvaria as text-fig. 3, X102.
10
THE method of operating upon stem apices and leaf primordia which we have
THE DETERMINATION OF AXILLARY BUDS BY MARY SNOW AND R. SNOW (With 10 figures in the text) THE method of operating upon stem apices and leaf primordia which we have practised for other purposes (1931, 1935)
More informationPHYLLOTAXIS AND APICAL GROWTH
PHYLLOTAXIS AND APICAL GROWTH BY ELIZABETH G. CUTTER Department of Botany, University of Manchester {Received 12 May 1963) SUMMARY Apical size, phyllotaxis index and the rate of leaf inception v^^ere compared
More informationFURTHER EXPERIMENTS ON PLAGIOTROPISM AND CORRELATIVE INHIBITION
[254] FURTHER EXPERIMENTS ON PLAGIOTROPISM AND CORRELATIVE INHIBITION BY R. SNOW Fellozv of Magdalen College, Oxford From his excellent study of correlative inhibition in Araucaria excelsa Massart (1924)
More informationPhyllotaxis as a Dynamical Self Organizing Process Part III: The Simulation of the Transient Regimes of Ontogeny
J. theor. Biol. (1996) 178, 295 312 Phyllotaxis as a Dynamical Self Organizing Process Part III: The Simulation of the Transient Regimes of Ontogeny Laboratoire de Physique Statistique, 24 rue Lhomond,
More informationEFFECTS OF GIBBERELLIC ACID ON INTERNODE GROWTH AND STARCH CONTENTS OF EUCALYPTUS CAMALDULENSIS SEEDLINGS
New Phytol. {ig()) S, ioiyio22. EFFECTS OF GIBBERELLIC ACID ON INTERNODE GROWTH AND STARCH CONTENTS OF EUCALYPTUS CAMALDULENSIS SEEDLINGS BY E. P. BACHELARD Department of Forestry, Australian National
More informationOF THE LEMNA FROND MORPHOLOGY
MORPHOLOGY OF THE LEMNA FROND FREDERICK H. BLODGETT (WITH PLATE XIV AND ONE FIGURE) In the case of structure simplified by reduction, it is sometimes necessary to trace the development of the parts through
More informationTORSIONS INDUCED BY AUXIN
JUNE 1947 VOL. 46, No. i TORSIONS INDUCED BY AUXIN BY R. SNOW Fellow of Magdalen College, Oxford (With I figure in the text) It was reported in a previous paper of this series (1945, p. 77) that petioles
More informationIntroduction to Botany. Lecture 25
Introduction to Botany. Lecture 25 Alexey Shipunov Minot State University November 2, 2015 Shipunov (MSU) Introduction to Botany. Lecture 25 November 2, 2015 1 / 33 Outline 1 Questions and answers 2 Stem
More informationFURTHER EXPERIMENTS ON THE INHIBITION OF THE DE-
480 PHYSIOLOG Y: SKOOG A ND THIMA NN PROC. N. A. S. FURTHER EXPERIMENTS ON THE INHIBITION OF THE DE- VELOPMENT OF LATERAL BUDS BY GROWTH HORMONE By FOLKE SKOOG AND KENNETH V. THIMANN WILLIAM G. KERCKHOFF
More informationarxiv: v1 [physics.bio-ph] 13 Dec 2012
Geometric interpretation of phyllotaxis transition Takuya Okabe Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan arxiv:1212.3112v1 [physics.bio-ph] 13 Dec 2012 Abstract
More informationA TEST OF SACHS'S THEORY OF THE PLAGIOTROPISM OF LAMINAE
[25] A TEST OF SACHS'S THEORY OF THE PLAGOTROPSM OF LAMNAE BY R. SNOW Fellozv of Magdalen College, Oxford (With 5 figures in the text) According to a suggestion of Sachs (179, pp. 246 and 254) the movements
More informationIX. PRIMARY STEM STRUCTURE AND DEVELOPMENT Bot 404 Fall 2004
IX. PRIMARY STEM STRUCTURE AND DEVELOPMENT Bot 404 Fall 2004 A. Shoot apex -plants have an open system of growth, therefore the ability (at least potentially) to continue growth because there is a meristem
More informationVEGETATIVE MORPHOLOGY OF FLOWERING PLANTS
VEGETATIVE MORPHOLOGY OF FLOWERING PLANTS Stems, roots, and leaves are the vegetative parts of vascular plants. Stems are the basic organs, as they give rise to other plant organs, such as roots, leaves,
More informationThe Geometric and Dynamic Essence of Phyllotaxis
Math. Model. Nat. Phenom. Vol. 6, No. 2, 20, pp. 1 16 DOI:./mmnp/20620 The Geometric and Dynamic Essence of Phyllotaxis P. Atela Department of Mathematics, Smith College, Northampton, MA 06, USA Abstract.
More information[ A WOUND SUBSTANCE RETARDING GROWTH IN ROOTS BY SIR FREDERICK KEEBLE, C.B.E., Sc.D., F.R.S., M. G. NELSON, M.A., AND R. SNOW, M.A.
[ 289 1 A WOUND SUBSTANCE RETARDING GROWTH IN ROOTS BY SIR FREDERICK KEEBLE, C.B.E., Sc.D., F.R.S., M. G. NELSON, M.A., AND R. SNOW, M.A. (From the Department of Botany, Oxford) I T has become well known
More informationPrimary Plant Body: Embryogenesis and the Seedling
BIOL 221 Concepts of Botany Primary Plant Body: Embryogenesis and the Seedling (Photo Atlas: Figures 1.29, 9.147, 9.148, 9.149, 9.150, 9.1, 9.2) A. Introduction Plants are composed of fewer cell types,
More informationLab Exercise 4: Primary Growth and Tissues in Stems
Lab Exercise 4: Primary Growth and Tissues in Stems Tissues of the plant body can be classified in a variety of ways: functionally (based on the tissue function, e.g. vascular tissue ), morphologically
More informationIntroduction to Botany. Lecture 9
Introduction to Botany. Lecture 9 Alexey Shipunov Minot State University September 17th, 2010 Outline Morphology of shoot 1 Morphology of shoot 2 morphology Outline Morphology of shoot 1 Morphology of
More informationDendrology FOR 219. Instructor: Dr. Jeremy Stovall. Lecture 3: Anatomy I: Vegetative Morphology
Dendrology FOR 219 Instructor: Dr. Jeremy Stovall Lecture 3: 01.24.2018 Anatomy I: Vegetative Morphology Tree Life Cycle Seed Seed Production Germination THIS CLASS Reproductive Tree Seedling Flowering
More informationTHE origin and early growth of seedling pineapple plants have
[305] DEVELOPMENTAL STUDIES OF THE PINE- APPLE ANANAS COMOSUS (L) MERR. I. ORIGIN AND GROWTH OF LFAVES AND INFLORESCENCE1 BY KENNETH R. KERNS, J. L. COLLINS AND HAROLD KIM Pineapple Experiment Station,
More informationThe Journal of General Physiology
RATE OF RESPIRATION AS RELATED TO AGE.* BY J. MILTON HOVER A~m FELIX G. GUSTAFSON. (From the Department of Botany of the University of Michigan, Ann Arbor.) (Accepted for publication, June 21, 1926.) It
More informationBald cypress Taxodium distichum in a swamp in North Carolina
Bald cypress Taxodium distichum in a swamp in North Carolina Bald cypress is another deciduous gymnosperm. It is native to the SE United States. It can tolerate a wide range of soil conditions. It is not
More informationTHE OHIO JOURNAL OF SCIENCE
THE OHIO JOURNAL OF SCIENCE VOL. XXIV JULY, 1924 No.. 4 THE VASCULAR ANATOMY OF CALAMOVILFA LONGIFOLIA.* ERNEST LINCOLN STOVER Eastern Illinois State Teachers' College The present study of the anatomy
More informationTHE PHYLLOTAXY OF COSTUS (COSTACEAE)
BOT. GAZ. 151(1):88-105. 1990. 1990 by The University of Chicago. All rights reserved. 0006-8071 /90/5101-0010$02.00 THE PHYLLOTAXY OF COSTUS (COSTACEAE) BRUCE K. KIRCHOFF AND ROLF RUTISHAUSER Department
More informationUseful Propagation Terms. Propagation The application of specific biological principles and concepts in the multiplication of plants.
Useful Propagation Terms Propagation The application of specific biological principles and concepts in the multiplication of plants. Adventitious Typically describes new organs such as roots that develop
More informationAMERICAN NATURALIST..
AMERICAN NATURALIST.. Vol. VII. AUGUST, 1873.- No. 8. PHYLLOTAXIS OF CONES.. BY PROFESSOR W. J. BEAL. IN the summer of 1870 I examined a large number of cones of several species of Coniferae to see if
More information* School of Biological Sciences, Carslaw Building, University of Sydney, Sydney, N.S.W By VERONICA H. K. Low*
Aust. J. biol. Sci., 1971, 24, 187-95 * School of Biological Sciences, Carslaw Building, University of Sydney, Sydney, N.S.W. 2006.. NTRODUCTON A detailed survey of the morphological and anatomical effects
More informationVisit For All NCERT solutions, CBSE sample papers, Question papers, Notes for Class 6 to 12. Chapter-6 ANATOMY OF FLOWERING PLANTS
Chapter-6 ANATOMY OF FLOWERING PLANTS POINTS TO REMEMBER Anatomy : Anatomy is the study of internal structure of organisms. Plant anatomy includes organisation and structure of tissues. Tissue : A group
More informationDEVELOPMENTAL GENETICS OF ARABIDOPSIS THALIANA
DEVELOPMENTAL GENETICS OF ARABIDOPSIS THALIANA CHASE BALLARD LINDA EAN HECTOR LOPEZ DR. JOANNA WERNER-FRACZEK IN COLLABORATION WITH DR. PATRICIA SPRINGER S LAB AT UCR AND ROBERT KOBLE PURPOSE OF RESEARCH
More information[279] A NOTE ON THE ORIGIN OF LATERAL ROOTS AND THE STRUCTURE OF THE ROOT-APEX OF LYGINOPTERIS OLDHAMIA
[279] A NOTE ON THE ORIGIN OF LATERAL ROOTS AND THE STRUCTURE OF THE ROOT-APEX OF LYGINOPTERIS OLDHAMIA BY A. C. HALKET (With Plate XI and i figure in the text) E 'GlNOPTERis oi.dh.imi.i, a plant of the
More informationPlant Structure, Growth, and Development
Plant Structure, Growth, and Development Plant hierarchy: Cells Tissue: group of similar cells with similar function: Dermal, Ground, Vascular Organs: multiple kinds of tissue, very diverse function Organ
More informationDIFFERENTIATION OF AVOCADO BLOSSOM BUDS IN FLORIDA
Reprinted for private circulation from the Botanical Gazette, Vol. 104, No. 2, December, 1942. DIFFERENTIATION OF AVOCADO BLOSSOM BUDS IN FLORIDA PHILIP C. REECE 1 (WITH THIRTEEN FIGURES) Subtropical Fruit
More informationPROTOCOL FOR DISTINCTNESS, UNIFORMITY AND STABILITY TESTS
PROTOCOL FOR DISTINCTNESS, UNIFORMITY AND STABILITY TESTS Gaura L. GAURA UPOV Species Code: GAURA Adopted on 21/03/2012 Entry into force on 21/03/2012 1 I SUBJECT OF THE PROTOCOL The protocol describes
More information(not by naphthylacetic acid and
Acta Bot. Neerl. 22(3), June 1973, p. 221-227. The auxin production of the physiological tip of the Avena coleoptile and the repression of tip regeneration by indoleacetic acid (not by naphthylacetic acid
More informationNOTES ON GINKGO BILOBA'
NOTES ON GINKGO BILOBA' WALTER WV. TUPPER (WITH PLATE xx) Among the gymnosperms, one of the groups most interesting from a morphological standpoint is the Ginkgoales, the only living representative of
More information162. Protosequoia (n, g.) in Taxodiaceae from Pinus tri f olia Beds in Central Honshu, Japan
No. 8] Proc. Japan Acad., 45 (1969) 727 162. Protosequoia (n, g.) in Taxodiaceae from Pinus tri f olia Beds in Central Honshu, Japan By Shigeru MIKI Mukogawa Women's Univ., Nishinomiya City, Hyogo (Comm.
More informationTHE EFFECTS OF LEAF PRIMORDIA ON DIFFERENTIATION IN THE STEM
[ 445 ] THE EFFECTS OF LEAF PRIMORDIA ON DIFFERENTIATION IN THE STEM BY B. S. YOUNG {Received 23 October 1953) (With 24 figures in the text) (i) INTRODUCTION The problem to be studied here is, what are
More informationON DIFFERENT FORMS OF FLOWERS IN THE SAME SPIKE IN DIGITALIS PURPUREA L., f. HEPTANDRA
MEDEDELINGEN LANDBOUWHOGESCHOOL WAGENINGEN NEDERLAND 80-(80) 8..:8. ON DIFFERENT FORMS OF FLOWERS IN THE SAME SPIKE IN DIGITALIS PURPUREA L., f. HEPTANDRA DE CHAMISSO M. E. VAN DEN NOORT and E. C. WASSINK*
More informationA handful of primary features are useful for distinguishing water primrose (Ludwigia) from other plants. Understand what to look for, such as leaf
A handful of primary features are useful for distinguishing water primrose (Ludwigia) from other plants. Understand what to look for, such as leaf arrangement and number of petals. Pairing morphological
More informationPlant Growth and Development Part I. Levels of Organization
Plant Growth and Development Part I Levels of Organization Whole Plant Organs Tissues Cells Organelles Macromolecules Levels of Organization Whole Plant Organs Tissues Cells Organelles Macromolecules 1
More informationBotany Physiology. Due Date Code Period Earned Points
Botany Physiology Name C/By Due Date Code Period Earned Points Bot Phys 5N5 Stem Forms Bot Phys 5-05 Identify the major forms of stems in plants I. Identify the major forms of stems in plants A. internal
More informationwith others and thus regenerate a functioning conductive system. Regeneration
388 BOTANY: SINNOTT AND BLOCH PROC. N. A. S. VISIBLE EXPRESSION OF CYTOPLASMIC PA TTERN IN THE DIFFERENTIATION OF XYLEM STRANDS BY EDMUND W. SINOTT AND ROBERT BLOCH OsBORN BOTANCAL LABORATORY, YALE UNIVERSITY
More informationPhyllotactic variability of some Algerian date palm varieties
Phyllotactic variability of some Algerian date palm varieties R. Benmehaia 1, A. Simozrag 2,3, M.A. Benmehaia 1 and M.M. Bentchikou 3 1 Department of Natural Sciences and Life, M sila University, Algeria.
More informationTHE ROOT-HAIRS, CAP, AND SHEATH OF AZOLLA.
THE ROOT-HAIRS, CAP, AND SHEATH OF AZOLLA. R. G. LEAVITT. (WITH PLATE XVI) ROOTS spring from the prostrate floating shoots of Azolla in acropetal succession at the points of branching. They are from 2
More informationPlant Structure. Lab Exercise 24. Objectives. Introduction
Lab Exercise Plant Structure Objectives - Be able to identify plant organs and give their functions. - Learn distinguishing characteristics between monocot and dicot plants. - Understand the anatomy of
More informationSupplemental Data. Wang et al. (2014). Plant Cell /tpc
Supplemental Figure1: Mock and NPA-treated tomato plants. (A) NPA treated tomato (cv. Moneymaker) developed a pin-like inflorescence (arrowhead). (B) Comparison of first and second leaves from mock and
More informationLearning objectives: Gross morphology - terms you will be required to know and be able to use. shoot petiole compound leaf.
Topic 1. Plant Structure Introduction: Because of its history, several unrelated taxa have been grouped together with plants into the discipline of botany. Given this context, in this first lab we will
More informationLevels of Organization
Plant Growth and Development Part I Levels of Organization Whole Plant Organs Tissues Cells Organelles Macromolecules Levels of Organization Whole Plant Organs Tissues Cells Organelles Macromolecules Plant
More informationAPPLICATIONS UNDER EXAMINATION. MAGNOLIA (Magnolia) Proposed denomination: Cleopatra Application number: Application date: 2011/02/25
(Magnolia) Proposed denomination: Cleopatra Application number: 11-7201 Application date: 2011/02/25 Applicant: Agent in Canada: BioFlora Inc., St. Thomas, Ontario Breeder: Description: PLANT: weak vigour,
More informationSTEMS Anytime you use something made of wood, you re using something made from the stem of a plant. Stems are linear structures with attached leaves
STEMS OUTLINE External Form of a Woody Twig Stem Origin and Development Stem Tissue Patterns Herbaceous Dicotyledonous Stems Woody Dicotyledonous Stems Monocotyledonous Stems Specialized Stems Wood and
More informationPlant Structure. Objectives At the end of this sub section students should be able to:
Name: 3.2 Organisation and the Vascular Structures 3.2.1 Flowering plant structure and root structure Objectives At the end of this sub section students should be able to: 1. Label a diagram of the external
More informationFinding the Center of a Phyllotactic Pattern
Finding the Center of a Phyllotactic Pattern Scott Hotton Department of Mathematics and Statistics, Miami University, Oxford, OH 45056 Abstract: The calculation of divergence angles between primordia in
More informationLife Science Chapter 11 SEED PLANTS PART 2
Life Science Chapter 11 SEED PLANTS PART 2 Advanced Seed Producing Advanced Seed Producing Vascular Plants Class: Gymnospermae Class: Angiospermae» Subclass: Monocotyledoneae» Subclass: Dicotyledoneae
More informationPlants. Tissues, Organs, and Systems
Plants Tissues, Organs, and Systems Meristematic cells Specialized cells that are responsible for producing specialized cells, they produce three types of tissue in the body of a plant. Meristematic Cells
More informationThe Shoot System of the Primary Plant Body
BIOL 221 Concepts of Botany Topic 03: The Shoot System of the Primary Plant Body A. Introduction The shoot consists of stems and leaves. It is quite modular in its construction. A shoot is made up of repeated
More informationLearning objectives: Gross morphology - terms you will be required to know and be able to use. shoot petiole compound leaf.
Topic 1. Introduction to Plants Introduction: Because of its history, several unrelated taxa have been grouped together with plants into the discipline of botany. Given this context, in this first lab
More informationROOTS. Syllabus Theme A Plant Structure and Function. Root systems. Primary Growth of Roots. Taproot system. Fibrous root system.
Syllabus Theme A lant Structure and Function A2: Structure and function of the basic plant organs ampbell & Reece hap. 35 Selected page numbers ROOTS Functions Anchors the vascular plant Absorbs minerals
More informationTHE REGENERATION OF THE STEM APEX
[ 37] THE REGENERATION OF THE STEM APEX BY MARY PILKINGTON (With Plates I and II and 20 figures in the text) INTRODUCTION 'T ^HE growing point of the stem has been the subject of compara- X tively little
More informationApplication of Two Mathematical Models to the Araceae, a Family of Plants with Enigmatic Phyllotaxis
Annals of Botany 88: 173±186, 2001 doi:10.1006/anbo.2001.1411, available online at http://www.idealibrary.com on Application of Two Mathematical Models to the Araceae, a Family of Plants with Enigmatic
More information(endosperm and scutellum) of Avena seedlings greatly reduces the production EFFECT OF THE ROOTS ON THE PRODUCTION OF A UXIN BY
272 PHYSIOLOGY: J. V. OVERBEEK Laboratory, and especially Mr. Philip Abelson, who determined the activity of the various phosphorus samples. We appreciate the interest of Dr. John Lawrence and Mr. Paul
More informationLaboratory 8: Ginkgo, Cycads, and Gnetophytes
IB 168 Plant Systematics Laboratory 8: Ginkgo, Cycads, and Gnetophytes This is the third and final lab concerning the gymnosperms. Today we are looking at Ginkgo, the Cycads, and the Gnetophytes, the so-called
More informationPlant Anatomy and Tissue Structures
Plant Anatomy and Tissue Structures The Two Major Plant Systems Reproductive shoot (flower) Terminal bud Node Internode Angiosperm plants have threse major organs: Roots Stems Leaves & Flowers Terminal
More informationEelgrass biomass and production
Eelgrass biomass and production Objectives To introduce methods for assessing basic parameters fundamental to many seagrass studies such as shoot size and stand structure expressed as biomass and shoot
More informationREVERSIONARY CHARACTERS OF TRAUMATIC OAK
REVERSIONARY CHARACTERS OF TRAUMATIC OAK WOODSI IRVING W. BAILEY (WITH PLATES XI AND XII) In studying the phylogeny of plants there are certain principles or canons of comparative anatomy which have been
More informationKodo millet (Paspalum scorbiculatum L.)
Kodo millet (Paspalum scorbiculatum L.) I Subject: These test guidelines apply to all the varieties, hybrids and parental lines of Kodo millet (Paspalum scorbiculatum L.) II Material required: 1. The Protection
More informationON 'THE STATIONARY SURFACE RING' IN HEART-SHAPED CLEAVAGE
400 ON 'THE STATIONARY SURFACE RING' IN HEART-SHAPED CLEAVAGE BY KATSUMA DAN Biology Department, Tokyo Metropolitan University and the Misaki Marine Biological Station, Miura-Shi, Japan {Received y October
More informationGEOMETRIC THEORY OF FRESNEL DIFFRACTION PATTERNS
GEOMETRIC THEORY OF FRESNEL DIFFRACTION PATTERNS Part V. Elliptic Obstacles and Apertures BY Y. V. KATHAVATE (From the Department of Physics, Indian Institute of Science, Bangalore) Received April 2, 1945
More informationCOMMON CONIFERS OF THE PNW
COMMON CONIFERS OF THE PNW The common conifers in the Pacific Northwest belong to the following genera: Abies, Calocedrus, Callitropsis, Juniperus, Larix, Picea, Pinus, Pseudotsuga, Taxus, Thuja, and Tsuga.
More informationNOTES: CH 35 - Plant Structure & Growth
NOTES: CH 35 - Plant Structure & Growth In their evolutionary journey, plants adapted to the problems of a terrestrial existence as they moved from water to land ANGIOSPERMS (flowering plants) -most diverse
More informationStems BI 103: Plant & Animal A & P. Learning Objectives
Stems BI 103: Plant & Animal A & P Outline: 1. Stems: monocots vs dicots--handout 2. Woody plant growth 3. Discussion problems 4. Monocots & soutside Learning Objectives What are the differences between
More informationThe plant body has a hierarchy of organs, tissues, and cells. Plants, like multicellular animals:
Chapter 28 The plant body has a hierarchy of organs, tissues, and cells Plants, like multicellular animals: o Have organs composed of different tissues, which are in turn composed of cells 3 basic organs:
More informationMeasurements of quantitative characters yield continuous data (value ranges) (Ex: plant height),
Taxonomic Evidence- Vegetative Characteristics Character and Character States An aspect of a plant, such as leaf shape or petal color is a character. Each character can have a character state, such as
More informationTurf Growth and Development
Turf Growth and Development Germination and Seedling Development Spikelet borne in Inflorescence Germination and Seedling Development Leaf and Stem Formation Inflorescence Roots Spikelet s Apex Caryopsis
More informationGibberellins (GA) are involved in cell elongation, particularly in the stem.
Plant Hormone Lab Plant hormones influence many aspects of plant growth, particularly cell proliferation and elongation. Different hormones are synthesized in different parts of the plant, and have complex
More informationImprovement of Quantitative Evaluation Method for Plant Type of Rice
Improvement of Quantitative Evaluation Method for Plant Type of Rice Katsuaki Suzuki 1, Zeyu Zheng 2 and Yutaka Hirata 1 1 Laboratory of Plant Genetics and Biotechnology, Tokyo University of Agriculture
More informationPlants. Plant Form and Function. Tissue Systems 6/4/2012. Chapter 17. Herbaceous (nonwoody) Woody. Flowering plants can be divided into two groups:
Monocots Dicots 6/4/2012 Plants Plant Form and Function Chapter 17 Herbaceous (nonwoody) In temperate climates, aerial parts die back Woody In temperate climates, aerial parts persist The Plant Body Functions
More informationYOM KAKIZAKI SAITAMAGRICULTURAL EXPERIMENT STATION, URAWA, SAITANA
A THE FLOWERING HABIT AND NATURAL CROSSING IN THE EGG-PLANT YOM KAKIZAKI SAITAMAGRICULTURAL EXPERIMENT STATION, URAWA, SAITANA In regard to the frequency of natural crossing in the egg-plant,. Solauum
More informationIII Conduct of tests:
Barnyard millet (Echinocloa frumentaceae (Roxb.) Link) I Subject: These test guidelines apply to all the varieties, hybrids and parental lines of Barnyard millet (Echinocloa frumentaceae (Roxb.) Link)
More informationQuestion 1: State the location and function of different types of meristem. Meristems are specialised regions of plant growth. The meristems mark the regions where active cell division and rapid division
More informationTARGET STUDY MATERIAL
TARGET STUDY MATERIAL Plus-1 Botany VOL I TARGET EDUCATIONAL INSTITUTION Target Educational institution is the one and only Entrance coaching and CBSE 10 th coaching centre at Mukkam with advanced technologies
More informationVARIATION IN THE SIZE OF RAY PITS OF CONIFERS.*
VARIATION IN THE SIZE OF RAY PITS OF CONIFERS.* FOREST B. H. BROWN. Since Haeckel proposed the word Ecology in 88, there has been an ever growing interest in the influence which environmental factors may
More informationPlant Anatomy. By Umanga Chapagain
Plant Anatomy By Umanga Chapagain PLANT ANATOMY The science of the structure of the organized plant body learned by dissection is called Plant Anatomy. In general, Plant Anatomy refers to study of internal
More information(Photo Atlas: Figures 9.147, 9.148, 9.150, 9.1, 9.2, )
BIOL 221 Concepts of Botany Fall 2007 Topic 07: Primary Plant Body: The Root System (Photo Atlas: Figures 9.147, 9.148, 9.150, 9.1, 9.2, 9.5 9.23) A. Introduction The root has the primary functions of
More informationBig Advantage!:Vegetative reproduction is a faster way to reproduce compared to sexual reproduction if the environment is favorable.
DAY 5 OF CHAPTER 25 NOTES http://www.toto.com/misha/mavica/folliage2.jpg Asexual reproduction in plants is also known as vegetative reproduction. Methods of vegetative reproduction include plant structures
More informationIdentifying Wheat Growth Stages
AGR-224 Identifying Wheat Growth Stages Carrie A. Knott, Plant and Soil Sciences University of Kentucky College of Agriculture, Food and Environment Cooperative Extension Service Identifying growth stages
More informationTECHNICAL WORKING PARTY FOR AGRICULTURAL CROPS. Twenty-Ninth Session Uppsala, Sweden, June 27 to 30, 2000
E TWA/29/17 ORIGINAL: English DATE: June 6, 2000 INTERNATIONAL UNION FOR THE PROTECTION OF NEW VARIETIES OF PLANTS GENEVA TECHNICAL WORKING PARTY FOR AGRICULTURAL CROPS Twenty-Ninth Session Uppsala, Sweden,
More informationBring Your Text to Lab!!!
Bring Your Text to Lab!!! Vascular Plant Anatomy: Flowering Plants Objectives: 1. To observe what the basic structure of vascular plants is, and how and where this form originates. 2. To begin to understand
More informationI. Lycopodiales: The Vegetative Features of the Sporophyte Phase
Lab II. Lycopodiales: the Clubmosses I. Lycopodiales: The Vegetative Features of the Sporophyte Phase The clubmosses (traditionally classified as species of the genus Lycopodium) are low, evergreen plants
More informationPhyllotaxy. Introduction. Introductory article
Rolf Rutishauser, University of Zurich, Zurich, Switzerland Peter Peisl, University of Zurich, Zurich, Switzerland Phyllotaxy (phyllotaxis) is the mode of arrangement of leaves, scales, or bracts with
More informationTopic 14. The Root System. II. Anatomy of an Actively Growing Root Tip
Topic 14. The Root System Introduction. This is the first of two lab topics that focus on the three plant organs (root, stem, leaf). In these labs we want you to recognize how tissues are organized in
More informationLeaf and Internode. Introduction. Parts of the Monocot and Dicot Leaf. Introductory article
Andrew Hudson, University of Edinburgh, Edinburgh, UK Christopher Jeffree, University of Edinburgh, Edinburgh, UK Leaves of different species show wide variation in morphology and anatomy, usually associated
More informationPHOTOPERIODISM IN RICE
PHOTOPERIODISM IN RICE II. PHOTOPERIODIC RESPONSE OF FOUR EARLY VARIETIES OF RICE OF UTTAR PRADESH BY GADADHAR MISRA Department of Botany, Ravenshaw College, Cuttack 3, India {Received 20 September 1953)
More informationHeight Variability Obtained From a New Dwarf Avocado Tree Population
California Avocado Society 1982 Yearbook 66: 155-160 Height Variability Obtained From a New Dwarf Avocado Tree Population F. Barrientos-Perez and S. Sanchez-Colin Centro de Genetica, Programa de Fruticultura,
More informationIdentification of Balsam poplars - 1
Identification of Balsam poplars - 1 Poplars (Populus spp.) can be split into four groups: 1. Populus tremula (Aspen) 2. Populus alba (White Poplar) and its hybrid with P. tremula, P. x canescens (Grey
More informationSESSION 6: SUPPORT AND TRANSPORT SYSTEMS IN PLANTS PART 1
SESSION 6: SUPPORT AND TRANSPORT SYSTEMS IN PLANTS PART 1 KEY CONCEPTS In this session we will focus on summarising what you need to know about: - Anatomy of dicotyledonous plants Root and stem: distribution
More informationCutting Propagation. Is the clonal multiplication of plants with propagules of stems, leaves or roots.
Principles of Propagation by Cuttings Dr. Fred Davies Department of Horticultural Sciences Texas A&M University College Station, Texas Cutting Propagation Shoot Adventitious Buds & Shoots Bud Is the clonal
More informationExercise 12. Procedure. Aim: To study anatomy of stem and root of monocots and dicots.
Aim: To study anatomy of stem and root of monocots and dicots. Principle: The study of internal morphology, i.e., cells of various tissues in an organ of a living body is called Anatomy. Tissue, which
More informationClass XI Chapter 6 Anatomy of Flowering Plants Biology
Class XI Chapter 6 Anatomy of Flowering Plants Biology Question 1: State the location and function of different types of meristem. Meristems are specialised regions of plant growth. The meristems mark
More informationFROM various experiments the writer concluded previously (1937, 1938) that
[ 177 A HORMONE FOR CORRELATIVE INHIBITION BY R. SNOW Fellow of Magdalen College, Oxford (With I figure in the text) I. INTRODUCTION FROM various experiments the writer concluded previously (1937, 1938)
More information(A) Buds (B) Lateral meristem (C) Apical meristem (D) Stem (E) Trichomes
AP Biology - Problem Drill 17: Plant Structure Question No. 1 of 10 1. What are hair-like outgrowths that protect and absorb nutrients? Question #01 (A) Buds (B) Lateral meristem (C) Apical meristem (D)
More information