pollination7560_2010_cut

pollination7560_2010_cut - Pollination Pollination Defn:...

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Pollination
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Pollination Def’n: transfer pollen from stamen to stigma Carpel also called pistil
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Life Cycle Sporic meiosis: Gametophytes make gametes BY MITOSIS Zygote grows into diploid sporophyte Sporophyte makes meiospores BY MEIOSIS Two bodies/one cycle: alternation of generations
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Life Cycle Overview:
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Life Cycle Overview: Fertilization: union sperm with egg to form zygote
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Floral variation Parts may be fused Like parts: connation (ex., petals to petals) Unlike parts: adnation (ex., stamens to petals) Snapdragon flower Anisacanthus (Acanthaceae) flower
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Floral variation Flowers with stamens and pistils: perfect flowers Another kind of perfection….
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Floral variation Some flowers imperfect. Pistillate (pistil) or staminate (stamens). Staminate flowers Sagittaria Pistillate flowers Sagittaria
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Floral variation Pistillate & carpellate flowers on separate individuals: Dioecy (MUST outcross) Monoecy: both sexes on same individual. Flowers missing one or more sets parts: incomplete flowers All imperfect flowers incomplete! Who am I?
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Floral symmetry Radial: divided into similar halves several ways Bilateral: divided into mirror images 1 way
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Ovary position Superior ovary (hypogynous) Perigynous flower Inferior ovary (epigynous)
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Floral variation Some flowers in groups: inflorescence Special type: head. Ex, sunflower Often: ray flowers, disk flowers disk flowers ray flowers
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Pollination as Mutualism Most flowering plants pollinated by animals Exceptions: wind pollinated (anemophily) water pollinated (hydrophily) Usually mutualism (+,+) Plant gets pollen transferred Animal gets “reward” Animal Reward…
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Rewards Pollen: high protein Also lipids, minerals, starch Renewed by: sequential anther dehiscence (multiple stamens) poricidal anthers (buzz pollination)
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pollination7560_2010_cut - Pollination Pollination Defn:...

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