期刊
PLANT CELL
卷 23, 期 4, 页码 1468-1479出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.110.081646
关键词
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资金
- Biotechnology and Biological Sciences Research Council (BBSRC)
- Engineering and Physical Sciences Research Council
- Wellcome Trust
- Engineering and Physical Sciences Research Council [EP/H024697/1] Funding Source: researchfish
- EPSRC [EP/H024697/1] Funding Source: UKRI
Plants must regulate their use of absorbed light energy on a minute-by-minute basis to maximize the efficiency of photosynthesis and to protect photosystem II (PSII) reaction centers from photooxidative damage. The regulation of light harvesting involves the photoprotective dissipation of excess absorbed light energy in the light-harvesting antenna complexes (LHCs) as heat. Here, we report an investigation into the structural basis of light-harvesting regulation in intact spinach (Spinacia oleracea) chloroplasts using freeze-fracture electron microscopy, combined with laser confocal microscopy employing the fluorescence recovery after photobleaching technique. The results demonstrate that formation of the photoprotective state requires a structural reorganization of the photosynthetic membrane involving dissociation of LHCII from PSII and its aggregation. The structural changes are manifested by a reduced mobility of LHC antenna chlorophyll proteins. It is demonstrated that these changes occur rapidly and reversibly within 5 min of illumination and dark relaxation, are dependent on Delta pH, and are enhanced by the deepoxidation of violaxanthin to zeaxanthin.
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