SOC205 Lecture Notes - Lecture 19: Osmosis, Atmospheric Circulation, Cryptochrome
12 May 2013
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Controls the growth of stems towards the light(phototropism) and the opening of stomata phototropin: a flavin containing protein, phototropin, absorb blue light, after absorption of blue light, phosphate is added to. Red light absorption vs. far red light absorption. Determines : a)seed germination b)stem and root growth c) flowering time. Play role in photodormancy (plants that require activation by light) Photo morphogenesis: effects of light on plant growth and development phototropin which initiates a signal transduction pathway leading to movement of auxin to the dark side of the stem. Phytochrome: the photoreceptor that absorbs light and causes developmental effects: this movement stimulates growth on the dark side of coleoptiles, causing movement of stem toward light. Phototropin is similar to other proteins that help detect light, oxygen and voltage (lov domain) Roots have a greater sensitivity to auxin (negative phototropism vs positive phototropism), concentrations of auxin that promote shoot growth, inhibit root growth.
