Effects of Temperature on the Hill Reaction and Photophosphorylation in Isolated Cactus Chloroplasts | Zendy

Ben C. Gerwick | Zendy; George Williams | Zendy; Ernest G. Uribe | Zendy

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Effects of Temperature on the Hill Reaction and Photophosphorylation in Isolated Cactus Chloroplasts

Author(s) -

Ben C. Gerwick,

George Williams,

Ernest G. Uribe

Publication year - 1977

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.60.3.430

Subject(s) - photophosphorylation , ferricyanide , chloroplast , electron transport chain , photosynthesis , hill reaction , cactus , botany , crassulacean acid metabolism , kalanchoe , chemistry , biology , biophysics , biochemistry , gene

Chloroplasts isolated from Opuntia polyacantha Haw. (Cactaceae) are capable of noncyclic electron transport and ATP synthesis. Hill reaction rates, measured by O(2) evolution or by ferricyanide reduction, increase with increasing temperature to approximately 40 C. The temperature optimum of NADP reduction is 42 C while the optimum for noncyclic photophosphorylation is 35 C. NADP-linked phosphorylation exhibits a higher coupling ratio (P/e(2)) than ferricyanide-linked photophosphorylation. The temperature optima for photochemical energy production correlate with photosynthetic properties of Crassulacean acid metabolism (CAM) plants and are discussed in relation to the operation of CAM at high tissue temperature.

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