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Articles

Effects of Growth Temperature on the Thermal Stability of the Photosynthetic Apparatus of Atriplex lentiformis (Torr.) Wats. ^1,2

Joseph A. Berry^b and David C. Fork^b

^a Department of Biological Sciences, State University of New York at Albany, Albany, New York 12222^,3, Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305

High growth temperatures induced a substantial increase in the thermal stability of the photosynthetic apparatus of Atriplex lentiformis. This was manifested as a much reduced inhibition of light-saturated photosynthesis and the initial slope of the light-dependence curves by exposure to high temperatures in high as compared to moderate temperature-grown plants. Heat treatment at 46 C of leaves from moderate temperature-grown plants resulted in a marked reduction in photosystem II activities of chloroplasts isolated from them. In contrast, heat treatment of leaves from high temperature-grown plants resulted in no reduction of photosystem II activities. In vivo estimates of photosystem II functioning, the 515 nm light-induced absorbance change, and the ratio initial to maximum fluorescence (F₀/F_max) indicated a similar increase in the thermal stability of photosystem II in high temperature-grown plants.

² CIW-DPB Publication No. 589.

³ Current address: Dept. of Botany, University of California, Davis, Calif. 95616.

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