BIOL 2080 Lecture Notes - Lecture 9: Phospholipid, Phytosterol, Amine
25 Mar 2016
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Have to break seed coat so that new seedling can develop. Get different structures growing out of seed. Seed coat; endosperm (triploid), which is the nutrition. Rely on that nutrition during germination because at this point, seed is underground: no photosynthesis, relies on endosperm. In dicots, a lot of energy in cotyledons: no endosperm, the nutrition all went into cotyledons, when seed germinates, produces a radicle that forms root system and epicotyl forms shoot, those two are connected by hypocotyl. For dicots, seed is in ground, once it germinates the seed coat breaks open. Hypocotyl bends and eventually starts to straighten, which helps cotyledons come out of groun. Endosperm doesn"t tend to be absorbed by cotyledons. Radicle starts to form as seed germinates. Coleoptile comes out and inside that is the shoot forming. From the coleoptile, we have the first leaf forming.
