Abstract
When environmental conditions such as temperature or salt concentration etc. are changed, photosynthetic organisms attenuate their metabolic systems and acclimate to the new environment. The cyanobacterium, Synechocystis sp. PCC6803 maintains constant growth rates between 25ºC and 40ºC. This is supported by constant photosynthetic rates at each cultivation temperatures. The cyanobacterium changes photosynthetic activity depending on temperature change. It is reported that photosynthetic activity gradually changes when cultivation temperature is changed in light conditions and reaches to its optimal rates at the temperature. But it is unclear if acclimation takes place in darkness. In this study, we investigated time-dependent activity changes on the shift of cultivation temperature between 25ºC and 35ºC. It was found that acclimation was not observed by temperature shift in darkness but occurred by the following light period. We will also report on the acclimation site in the electron transport system.
