BIO312H5 Lecture Notes - Lecture 9: Shade-Grown Coffee, Superoxide Dismutase, Photoinhibition

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27 Nov 2016
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Bio312: lecture 9 - responses and adaptation to abiotic stress (cid:1) light stress. Leaf movement in sun-tracking plants (lupinus succulentus: sun-tracking plants(cid:2) plants that follow the direction of the sunlight, plants optimize their ability to adjust ot different light conditions through the pigment composition. Most of chlorophyll is responsible for absorbing light in light harvesting antenna is chlorophyll b. In shade plants, there is an increase in the antennae size and there"s larger antenna complexes relative of reaction center to maximize light absorption. The opposite is true in the sun plants: reaction centers for sun plants is required more to protect the plants from excessive light. Scanning electron micrographs reveals differences in anatomy of sun vs shade grown leaves of a legume (leaf grown in sun displays high amount of spongy mesophyll cells compard to the leaf grown in shade) Features of plant acclimated ot sun or shade environments: shade leaves. + ratio of chlorophyll b to chlorophyll a.