BIOL 1105 Lecture Notes - Lecture 2: Axillary Bud, Oligosaccharide, Phloem
19 Aug 2016
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Document Summary
Pigments light absorbing molecules: allow plant to sense the quality and quality of light in the environment. Chlorophyll primary pigment involved in photosynthesis: chlorophyll uses light for energy and converts the light energy to chemical energy. Photomorphogensis refers to non directional light trigger development. Phytochrome pigment containing protein involved in photomorphogensis: uses light for information, exits in two forms that interconvert. Phytochorme red (pr) - absorbs red light at 660 nm. Biologically inactive and coverts to pfr when red photons of light are available. Phytochrome far red (pfr) absorbs red light at 730 n, Can promote a plant response by facilitating expression of light response genes. Direct sunlight has more red light than far red light therefore exposure to sunlight, promotes the conversion of pr to pfr. Pfr converts back to pr when far red photons are absorbed. Degraded by proteasome, thus a mass of pfr are regulated in the plant.
