Biology 4608G Lecture Notes - Lecture 4: Phytol, Light-Independent Reactions, De Novo Synthesis
29 Apr 2013
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Document Summary
Xanthophyll cycle, state transition - no de novo synthesis. Integration of long and short term acclimation processes over time. See effects of photoacclimation at the level of phenotype - reflects different time scales - stress vs acclimation. Change in phenotype can be accounted for at levels of transcription/translation. Plant must be sending change in light to induce change in phenotype. Sensor is etc - redox state of the pq pool. Lhc shrinks in response to light - decrease in sigma psii, decrease in efficiency with which the organism will use the light. In long-term - light saturated, light not limiting, can decrease efficiency. Dcmu binds to the qb binding site of psii - where plastoquinone dissociates when reduces by qa (photochemistry) and protonated using h+ from stroma. Dcmu binds - inhibits electron transport - electrons no longer coming out of psii.
