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Plant and Cell Physiology, 1973, Vol. 14, No. 1 119-126
© 1973

Article

Biophysical studies on subcellular particles VII. Combined effects of alcohol and heat on photosynthetic activities in isolated spinach chloroplasts

Yasuo Mukohata, Takao Yagi, Akemi Matsuno and Mitsuhiro Higashida

Department of Biology, Faculty of Science, Osaka University Toyonaka, Osaka 560, Japan

Isolated spinach chloroplasts were warmed for 5 min at temperatures ranging between 20° and 55°C in the presence of short-chain aliphatic alcohols, and their photosynthetic activities were assayed.

Tmax, the temperature at which ferricyanide reduction is stimulated to a maximum extent, was lowered with an increase in the concentration of alcohol or the chain-length of n-alcohols. Values also differed among the structural isomers of an alcohol. The Tmax shift was observed only when alcohol was present in a chloroplast suspension during warming treatment, indicating that heat and alcohol were acting together to lower the Tmax, at which the phosphorylation activity fell to zero.

The combined effects of alcohol and heat are discussed in connection with the lipophilic construction of thylakoids through the partition co-efficient of individual alcohols between water and n-octyl alcohol.

(Received August 5, 1972; )
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