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Photosynthetic Adaptation to High Temperature Associated with Thylakoid Membranes of Synechococcus PCC7002 |
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| Authors: | Nishiyama, Yoshitaka Kovcs, Eszter Lee, Chin Bum Hayashi, Hidenori Watanabe, Tadashi Murata, Norio |
| Affiliation: | 1Department of Regulation Biology, National Institute for Basic Biology Myodaiji, Okazaki, 444 Japan 2Institute of Industrial Science, University of Tokyo Roppongi, Tokyo, 106 Japan 3Institute of Biochemistry, Biological Research Center of Hungarian Academy of Sciences Present address: H-6701 Szeged, P.O. Box 521, Hungary 4Department of Biology, College of Natural Science, Dongeui University Present address: Pusan, 614-714 Korea |
| Abstract: | Photosynthetic adaptation to high temperature was investigatedin intact cells and isolated thylakoid membranes of the cyanobacterium,Synechococcus PCC7002. In intact cells, the thermal stabilityof photosynthesis and photosystem 2-mediated electron transportfrom H2O to 1,4-benzoquinone changed in concert with growthtemperature. The photosystem 2-mediated electron transport fromH2O to phenyl-1,4-benzoquinone showed greater thermal stabilityin thylakoid membranes isolated from cells which had adaptedto high temperature than in those from non-adapted cells. Enhancedthermal stability was also observed in the thylakoid membranesin the transport of electrons from H2O to 2,6-dichlorophenolindophenolbut not in the transport of electrons from diphenylcarbazideto 2,6-dichlorophenolindophenol. These observations suggestthat oxygen-evolving sites acquire enhanced thermal stability,and that factors which are responsible for thermal stabilityremain in isolated thylakoid membranes. (Received October 30, 1992; Accepted December 18, 1992) |
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