Introduction to Botany. Lecture 11
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1 Introduction to Botany. Lecture 11 Alexey Shipunov Minot State University September 21st, 2011
2 Outline Questions and answers 1 Questions and answers 2
3 Outline Questions and answers 1 Questions and answers 2
4 Previous final question: the answer What is ataktostele?
5 Previous final question: the answer What is ataktostele? Dispersed (scattered) vascular bundles of monocots
6 Primary structure of stem
7 Cork cambium and origin of bark Bark is everything outside vascular cambium, therefore, bark = secondary phloem + periderm Each year new layer of cork cambium appear from parenchyma cells of secondary phloem Consequently, bark consists of multiple and mostly uneven layers
8 Bark, cork, periderm and wood Bark = secondary phloem + periderm Periderm = phellem + cork cambium + felloderm Cork = phellem Wood = trunk bark, or simply secondary xylem
9 Bark and wood Questions and answers Bark = 1 + 2, wood is 5 (heartwood) and 6 (sapwood)
10 Renewal of bark in sea buckthorn (Hippophaë rhamnoides)
11 Secondary phloem Questions and answers Forms outside vascular cambium Rich of fibers Does not form annual rings Has rays of parenchyma cells, sometimes wedge-shaped (dilated)
12 Dilated rays of beech (Fagus sp.)
13 Periderm Questions and answers Periderm is the product of cork cambium 99% of periderm is a phellem (cork), thick outside layer Phelloderm is a tiny layer of living cells inside of cork cambium
14 Formation of bark zone in medlar (Mespilus germanica)
15 Lenticels Questions and answers Lenticels are specialized regions of periderm; they supply stem cells with oxygen In order to produce lenticel, some cells of cork cambium divide and grow much faster than others
16 Lenticel of elderberry (Sambucus sp.)
17 How cambium is working
18 Secondary structure of stem (scheme)
19 Secondary structure of stem (photo and explanations)
20 Secondary xylem and rays Secondary xylem, or wood, is the product of vascular cambium Some cambium cells are fusiform initials; they form axial vessel elements Other cambium cells are ray initials; they form rays (parenchyma + tracheids) Rays provide horizontal transport of water; axial system provide vertical transport
21 Fusiform and ray initials
22 Three planes of view Transverse* (cross-section) Radial (longitudinal section from center to periphery and perpendicular to stem surface) Tangential (longitudinal section parallel to stem surface)
23 Three plains of maple (Acer sp.) wood
24 Three plains again (the scheme)
25 Earlywood and latewood Earlywood (springwood) contains more parenchyma and often have larger vessel elements Latewood (summerwood) often have small vessel elements and looks darker
26 Diffuse and ring porous wood In ring porous wood (like in red oak) bigger vessel elements concentrate in earlywood In diffuse porous wood larger vessel elements spread across early- and latewood (American elm)
27 Diffuse and ring porous wood in two species of cinquefoil (Potentilla spp.)
28 Annual rings Questions and answers Interleaving early- and latewood from to sequential years form an impression of annual ring Ring is just a layer of darker (i.e., smaller) cells Tropical trees do not form annual rings
29 Annual rings in juniper (Juniperus sp.)
30 Sapwood and heartwood Sapwood is a peripheral layer of working xylem, it usually has relatively light color Heartwood is a central, non-functional, old, dark-colored xylem
31 Sapwood and heartwood of European pine (Pinus sylvestris)
32 Tyloses Questions and answers Tyloses control the winter functioning of vessels
33 Two taxonomic terms Gymnosperms All seed plants except angiosperms = Spermatophyta Magnoliopsida Dicots All angiosperms except monocots = Magnoliopsida Liliidae
34 Conifer wood Questions and answers Simpler structure, few cell types Simple rays Sometimes have resin ducts; resin secreted by epithelial cells
35 Ginkgo (Ginkgo biloba) wood (not a conifer, but gymnosperm)
36 Resin duct in pine wood ( c BSA)
37 Monocot wood Questions and answers Most of monocots do not have lateral meristems and therefore have no true wood Palms have only primary tissues; their trunk widens from bottom to top Some monocots (dragon trees) have anomalous secondary growth
38 Cross section of palm (Phoenix canariensis) trunk
39 Dragon tree (Dracaena draco)
40 Anomalous secondary growth in Bougainvillea (Bougainvillea spectabilis)
41 Summary Questions and answers Bark consists of secondary phloem and cork Wood is a secondary xylem
42 Final question (1 point)
43 Final question (1 point) Where is a cambium?
44 For Further Reading Appendix For Further Reading J. E. Bidlack, Sh. H. Jansky. Stern s introductory plant biology. 12th edition. McGraw-Hill, Chapter 6. Th. L. Rost, M. G. Barbour, C. R. Stocking, T. M. Murphy. Plant Biology. 2nd edition. Thomson Brooks/Cole, Chapter 5.
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