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State I-State II transitions in the thermophilic blue-green alga (cyanobacterium) Synechococcus lividus



State I-State II transitions in the thermophilic blue-green alga (cyanobacterium) Synechococcus lividus



Photochemistry and photobiology 37(4): 421-427



Time courses of state I-state II transitions were measured in the thermophilic blue-green alga (Cyanobacterium), S. lividus, that was grown at 55.degree. C. The rate of the state I-II transition using light II illumination was the same as that in the dark and the dark state was identified to be state II. Therefore, light regulation attained by state transitions is produced by the state II-I transition induced by system I light. The redox level of plastoquinone did not affect this dark state II. Arrhenius plots of the state transitions showed a break point around 43.degree. C that corresponded to the phase transition temperature of this alga. Since both the state I-II and II-I transitions were very much temperature-independent, the alga could be kept in either state for a long time at a low temperature, such as room temperature. Activities of both photosystems I and II in states I and II were also measured. After a state II-I transition, the system II activity increased about 16% and at the same time, system I activity decreased about 30%.

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