My_Ch39_lecture(2009030500032414)

My_Ch39_lecture(2009030500032414) - Chapter 38 Angiosperm...

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Chapter 38: Angiosperm Reproduction Purpose —to understand the reproductive cycle and structures of angiosperms What you MUST know in Ch 38: Angiosperm reproduction overview Seed structure Test tube cloning Read the relevant information in Cliff’s on angiosperm reproduction, seed structure, and plant propagation. I am not re-visiting the angiosperm life cycle .... and you should have a diagram of your own to review! Chapter 39: Plant Responses to Signals (Control Systems in Plants) Purpose —to understand plant signaling, including plant hormones and other substances that allow communication between plant cells What you MUST know in Ch 39: Signal transduction Discovery of plant hormones Role of auxins, cytokinins, gibberellins Abscisic acid Ethylene Phytochromes Photoperiodism Tropisms The take-home message of this chapter is that plants are complex organisms with signaling systems, hormones, and responses to environmental stimuli (such as sunlight).
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Phototropism is the growth of a plant shoot towards light Studies on what was responsible for phototropism led to the discovery of the plant hormone auxin: (Darwin & son, Peter Boyson-Jensen, F.W. Went (1926) extracted auxin , a chemical messenger = hormone produced in the tip of the coleoptile (p 752-753), Kenneth Thimann @ Caltech purified and determined the chemical structure of auxin) Plant hormones (table 39.1, p 754) Auxins o produced in seed embryo, meristems of apical buds, young leaves o works by elongating developing cells o increases H + concentration in cell walls, which loosens cellulose fibers so the cell can expand o Auxins are transported from the apex down the shoot (one-way = polar transport ) through chemiosmosis (fig 39.4, p 755) o stimulate: stem elongation root growth, differentiation, and branching (made in root tips) development of fruit
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