Review PLS 360 - Ethylene and abscission Endosperm...

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Ethylene and abscission Endosperm, Cotyledon = seed storage Anthers, stamen= male part Programmed cell death example is leaves falling off the tree in autumn Potato= asexual reproduction via a tuber Post-embryonic development Mammals contain nearly all of their “parts” at birth: limbs, organs, bones Plants grow organs through this Hormones mediate post-embryonic growth: Nutrient-rich soil causes less root growth and more lateral shoot growth by inducing cytokinin Cutting off the top of a plant induces more lateral shoot by cutting off the auxin supply Flooding causes taller plants by inducing active gibberellin production Embryogenesis Embryonic development is very ordered Root apical meristem: cells for root growth Radicle: the embryonic root Hypocotyl: embryonic stem Cotyledons: embryonic leaves, food storage Shoot apical meristem: cells for aerial growth
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Unformatted text preview: Auxin is a major contributor of plant form by influencing phyllotaxis, organogenesis, and apical dominance Phyllotaxis Alternate, decussate (opposite), spiral, whorled Organogenesis Auxin has polar movement, auxin maximum on a certain spot where next leaf primordia forms Axillary buds/meristems come from SAM Undifferentiated cells left behind De-differentiation is associated with auxin In a root, promotes becoming meristems Adventitious growth Can get shoots or roots from any cell *CQ: which hormone commonly counteracts Auxin? Cytokinin Cytokinin also contributes to plant form by counteracting auxin and redistributing nutrients from roots to shoots Cytokinin responses Promote nutrient redistribution and communicate nutrient status Promotes shoot growth...
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  • Spring '14
  • KennethFeldmann
  • Plant morphology, root apical meristem

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