BIOL 205 Lecture Notes - Lecture 16: Ostiole, Phytic Acid, Double Fertilization
7 Sep 2016
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Document Summary
In inductive conditions repressor gene is inactivated: hd3a free to express itself. Tapetum payer: cells lyse to provide nutrition to microspore, microspores mature into pollen grains. 1: large anthers and stigma, animals, large, showy, fragrant. If compatible absorb water and swells: germinates and produces pollen tube. If germinates grow short distance and dies: sphorophytic incompatibility. 13: different parts of ovule and embryo sac give rise to different parts of seed. Pollination and seed development: aba prevents germination inside the mother plant, 2 mutations can lead to precocious germination. Inability to synthesize aba: germinates right in fruit. Insensitivity to aba: mutation in receptor that senses aba, viviparous mutants. Sequence of events in seed development: embryogenesis, seed development, growth, germination genes not repressed, germination is inhibited by aba, seed starts drying out, dna synthesis stops, seed dries out dormant cell. Storage food reserves: starch, proteins, fats, phytic acid or phytate. Storage of minerals: phytate, hexaphosphoric acid ester of myo-inositol phytin.
