MAGNOLIA botany. evergreen ; spicy odor of blooms; chambered pith; hairy leaves(lower epidermis) & petioles
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1 MAGNOLIA botany Angiosperm: primitive, ancestral (Not Eudicot, Not Monocot): order Ranales: family Magnoliaceae: Magnolia grandiflora (southern magnolia) evergreen ; spicy odor of blooms; chambered pith; hairy leaves(lower epidermis) & petioles
2 Flowers, Pollen & Pollination; Fertilization & Embryogenesis Young & Older Flower Bud: note hairy bud scale Axillary Bud & single scale Axillary bud
3
4 Note pollen sac on legs Bees continue to collect pollen from anthers after they ve fallen onto petal
5
6 Pistils (w/ Superior unfused ovaries) Will produce red seeds when each capsule splits laterally Stamens Attachment area of Stamens Petals
7 After 1 day, petals turn yellow-brown and all stamens (anthers & filaments) have fallen off
8 79-81 um Monosulcate Pollen with very fine surface ornamentation and thin Exine
9 Medial surface of 3 rd Leg of Honey Bee showinkg Pollen Packer Femur Tibia Comb / Rake Pollen Basket Auricle 1 st Tarsal with Brush Auricle Medial view Lateral view
10 WORKER Smooth, shiny area on lateral side of TIBIA is the Pollen Basket (Corbicula) ; just above the auricle. Seta around triangular area of Basket secure pollen. Opposite 1 st Tarsal inside (lateral) view showing Pollen Brush Sting
11 Comb / Rake Fine, parallel hairs (setae) of Pollen Brush on Tarsal Collect pollen to be combed up by rake on opposite leg Inside (medial) view of 1 st Tarsal segment and Tibia
12 Corbicula Auricle Outside (Lateral) view of 1 st Tarsal segment and Tibia: After Rake pulls pollen from opposite Pollen Brush, the Auricle (with pollen on its surface from the opposte rake) pushes the pollen up into the Pollen Basket of the lower tibia ( also called the Corbicula )
13 EYE Antenna Labrum, Clipeus & Mandible Sting Characteristic wing cells of!st pair (Rs & M) Hymenoptera;Apidae; Apinae; Apis mellifera Linn. the European Honey Bee
14
15 2 germinative & 1pollen tube (vegetative) nuclei in pollen tube Pollen grain micropyle 3 views of ovule 4-8 nuclei stage; note chromosomes in mitotic divisions of 1n nuclei in right-hand photo Will land on stigma & grow down style to ovule
16 Plant Embryo: Later Stage Suspensor Basal Cell Endosperm Funiculus to Placenta Cotyledons(2), Shoot apex, Seed Coat, Hypocotyl, Radicle = Epicotyl Very early embryo on its suspensor cells
17 Seeds mature ripen and burst out to be eaten by birds and dispersed JUNE SEPT.
18 embryo
19 STEMS 1 years growth Leaf Scar Younger, 1year Older, 2+ years Axillary Bud scale scar
20 Older Stem, towards trunk Cortex Cork or Phellem Cork Cambium Phelloderm Narrow PHLOEM RAY Zone of Sclereids Wide/Broad PHLOEM RAY Vascular Cambium Wood Rays in Xylem
21 Sclereids in zone above primary Phloem
22 late wood late wood late wood early wood early wood late wood early wood late wood early wood early wood Five Year-old Magnolia stem cut in July Primary Xylem PITH PITH
23 Hill et al., Botany, 1950
24 Transv erse or Cross Sectio n Radial Passes from surface through center of stem Tangential Pith
25 Phellem outer cork or bark Phellogen or cork cambium Phelloderm- a parenchyma Periderm Cortex Sclerenchyma or phloem fibers- continuous Slerenchyma fibers of vascular bundle Wide phloem RAY Annual Phloem Layers of narrow phloem RAYS - squashed late wood early wood Vascular Cambium Xylem RAYS late wood last year Cross section
26 Phellem outer cork or bark Phellogen or cork cambium Phelloderm- a parenchyma Cortex Sclerenchyma or phloem fibers- continuous Slerenchyma fibers of vascular bundle phloem RAY Annual Phloem Layers of narrow phloem RAYS Vascular Cambium Xylem RAYS Radial Section
27 bark Vascular Cambium pith Sclerenchyma phloem fibers Origin of secondary Xylem & Phloem in Dicots (after Bowes, 1996)
28 Ray Ray Vessel Elements Tracheids
29 Ray initials Vascular cambium
30 Radial section Pore in Ray Parenchyma Wall tracheids Vessel Vessel Vessel RAY
31 V e s s e l t r a c h e i d s V e s s e l Primary wall Secondary wall V e s s e l Radial section
32 Pores / Plasmodesmata in ray walls Bordered Pit in Tracheid Tracheids RAY Radial section
33 Tangential sections showing rays in end view
34 Phellem outer cork or bark with tannin Phellogen or cork cambium Phelloderm- a parenchyma cortex Periderm
35 Sclerenchyma Narrow PHLOEM RAY PHLOEM Wide PHLOEM RAY Epidermis & Cuticle Cork Cambium Phelloderm Cortex Vascular Cambium b a r k Sclerenchyma fibers Spring (when cut) Previous Summer Wood Ray in Xylem Previous Spring PITH Basswood, Tilia : for comparison 1.5 years
36 Stem Growth: from Cambium out as phloem;etc. and cambium in as xylem, so stem grows longer and thicker Cork Cortex&Phloem Cambium Wood Pith P X Younger Older
37 Terminal Bud & Scale Thick, leathery leaves: 6 inches long Petiole (hairy)
38 Darker, older leaves: note thick waxy cuticle on upper surface(adaxial)
39 Dorsal, Top, Adaxial view of leaf, note efficient coverage by secondary & tertiary Veins: netted
40 Ventral, Abaxial view of Leaf : note hairs and dull, thin cuticle Midvein
41 Leaf Blade hand section w/ thick upper cuticle (shiny) HAIRS on lower epidermis
42 Palisades Mesophyll 1 cell thick Leaf blade Midvein Hairy lower Leaf Epidermis
43 Secretory Cells HAIRS Lateral tracheid elements
44 Cuticle Upper Epidermis Single cell thick Palisades Mesophyll Secretory Cells Mesophyll Lower Epidermis Hairs (Trichomes) are Multicellular & Uniseriate
45 Pith X P Vascular cambium cortex epidermis epidermis Parts of 2 sections through petioles of leaf: note distinct but coalescing vascular bundles (blue oval) and trichomes or hairs
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