Responses to excess light Photoinhibition and photo-oxidative damage

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Presentation transcript:

Responses to excess light Photoinhibition and photo-oxidative damage REWM 3500 Rangeland Plant Ecophysiology Wednesday, September 9, 2009 Responses to excess light Photoinhibition and photo-oxidative damage The Xanthophyll cycle Chloroplast movements

7.19 Funnelling of excitation from antenna system toward reaction center pp4e-fig-07-19-1.jpg

9.12 Excess light energy in relation to a light-response curve of photosynthetic O2 evolution pp4e-fig-09-12-0.jpg

9.15 Changes in the light-response curves of photosynthesis caused by photoinhibition pp4e-fig-09-15-0.jpg

7.34 Regulation of photon capture and the protection and repair of photodamage pp4e-fig-07-34-0.jpg

7.35 Chemical structure of violaxanthin, antheraxanthin, and zeaxanthin pp4e-fig-07-35-0.jpg

9.13 Diurnal changes in xanthophyll content as a function of irradiance pp4e-fig-09-13-0.jpg

9.14 Chloroplast distribution in photosynthesizing cells of the duckweed Lemna pp4e-fig-09-14-0.jpg

Terms and concepts to understand: Photoinhibition (dynamic and chronic) Photo-oxidative damage Carotenoids Xanthophyll cycle Zeaxanthin Violaxanthin Chloroplast movements