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Society for Conservation BiologySociety for Conservation BiologyAuburn University ChapterAuburn University Chapter
Check us out on Facebook
WHEN?
TUESDAYTUESDAY Mar. 3
6:00-7:00 PM
Guest Speaker: Dr. David SteenGuest Speaker: Dr. David Steen““Road mortality and freshwater turtle Road mortality and freshwater turtle
conservation in North Americaconservation in North America””
Also: Info on Tigers 4 Tigers plans for spring semester!
WHERE? 112 Rouse
Life Sciences
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Ch. 7: Plant Growth and Reproduction
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Plant Growth• Includes:
– phenology– location of overwintering buds (criterion for
major subdivisions)
Fig. 7.2
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Plant Growth• Main Raunkiaer categories (7):
– 7) Epiphyte: germinates & grows on plants
Lab #3: Who am I??
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Epiphyte Focus• Effect on host:– Negligible (commensalism: one benefits & other
unaffected) – (+,0) (epiphyte, host)
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Epiphyte Focus• Effect on host:
– Positive. Canopy roots (host): roots
– Mutualism: (+,+)
Trees knownto form canopyroots
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Parasitic Epiphytes• Negative: Parasites. Tap • Parasitism. (+,-) (epiphyte, host)
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Parasitic Epiphytes• Holoparasites: No chlorophyll. Haustoria (modified
roots) penetrate • Ex, dodder (Cuscuta)
“Witches hair”“Love vine”
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Parasitic Epiphytes• Hemiparasites: Chlorophyll-- water & nutrients from
• Ex, Who am I? (Lab #3)
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Plant Reproduction
• 2 main types
Two main types…..
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Plant Reproduction• Sexual reproduction: genetically varying
offspring (via meiosis & fertilization)
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Plant Reproduction• Asexual reproduction: genetically identical
offspring (involves mitosis)– Ex, clonal growth (discussed)
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Plant Reproduction• Agamospermy: seeds asexual (CLONES)
– Exs: Taraxacum (dandelion), some Rubus
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Plant Reproduction• Asexual reproduction: genetically identical
offspring• Sexual reproduction: genetically varying
offspring (via meiosis and fertilization)
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Plant Reproduction• Meiosis: reduction
division• 2N to 1N
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Plant Reproduction• Fertilization: gametes (egg+sperm) form
• 1N to 2N
Human example….
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Plant Life Cycle• Life cycle: Involves 1) meiosis, 2) fertilization, 3)
haploid cells, 4) diploid cells
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Plant Life Cycle• Sporic meiosis:• 2 bodies, 1 cycle: alternation of generations• Sporophyte 2N, gametophyte 1N
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Plant Life Cycle• Gametophyte (1N): gametes BY MITOSIS• Fertilization: zygote (2N)
Start
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Plant Life Cycle• Zygote to sporophyte (2N): mitosis• Sporophyte: spores BY MEIOSIS• Spore to gametophyte:
End
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Plant Life Cycle• Mosses: gametophyte leafy
– Sporophyte on
Granite outcrop lab
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Plant Life CycleSeed plants + ferns: major body = _______
Who am I? (Lab 3)Epiphyte fernSite for sori….
Lab #1?
Where other “body”?
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Plant Life Cycle• Where
gametophytes?– Seed plants:
male = pollen grain
Ferns
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Plant Life Cycle• Female
gametophyte (embryo sac): inside ovule
Ovules in ovary
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Life Cycle• Mature male gametophyte =
• Fertilization: sperm & egg form zygote (2N)
DOUBLE fertilization!
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Life Cycle• Zygote: embryo in ovule• Endosperm: nutritive
• Ovule into seedWhat’s a seed??
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Life Cycle• Seed: baby plant ( : new sporophyte) in
box ( coat) with lunch ( : flowering plants)
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Terms• Flower parts (BIOL 1030)• 4: sepals, petals, stamens, pistil(s)
Carpel=Pistil here
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Floral variation• Fusing petals
– Long-tongued/long-billed pollinators
Who am I? (Lab #3)seeds
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Floral variation• Stamens & pistils: perfect flowers
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Floral variation• Some imperfect. • Pistillate (pistil) or staminate (stamens)
Staminate flowers of SagittariaPistillate flowers of Sagittaria
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Floral variation• Pistillate & carpellate .: dioecious (MUST
outcross)• Monoecious: both sexes
Cones!
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Floral variation• Ex. dioecious species: Persimmon
(Diospyros virginiana)
Persimmon fruits
Staminateflower
Pistillateflower
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Floral variation• Complete flowers: all 4 parts (sepals, petals, stamens,
pistil)• Lack : incomplete flowers
Diospyros?
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Floral variation• Group flowers: inflorescence
– One type: head– Ex, sunflower (Asteraceae)– Ray flowers: lg. – Disk flowers sm.
diskflowers
ray flowers
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Floral variation• Who am I? (Lab #1)
– Inflorescence: white structures = bracts
Inflorescence Closeup showing individualgreenish flowers
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Pollination• Why flowers vary? Many form mutualism w/ animals
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Terms• Pollination (flowering plants): transfer
Carpel=pistil
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Terms• Fertilization: sperm fuses w/ egg (in ovule),
makes
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Pollination• Abiotic: pollen carried
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Wind Pollination• Grasses, temperate trees
(Quercus, Carya, Pinus)• Not
CaryaA grass
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Terms• Biotic pollination: pollen carried by animal--
90% flowering plants– Floral visitor: visits – Pollinator: deposits
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Pollination as MutualismMutualism (+,+) interaction
– Plant gets– Animal gets
Reward?
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Animal Rewards• Pollen: hi • Also lipids,
Renewable…