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Plant Physiology 61:411-415 (1978)
© 1978 American Society of Plant Biologists

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Articles

Photosynthetic Acclimation to Temperature in the Desert Shrub, Larrea divaricata

II. Light-harvesting Efficiency and Electron Transport 1

Paul A. Armond, Ulrich Schreiber2 and Olle Björkman

Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305

The response of photosynthetic electron transport and light-harvesting efficiency to high temperatures was studied in the desert shrub Larrea divaricata Cav. Plants were grown at day/night temperatures of 20/15, 32/25, or 45/33 C in rough approximation of natural seasonal temperature variations. The process of acclimation to high temperatures involves an enhancement of the stability of the interactions between the light-harvesting pigments and the photosystem reaction centers. As temperature is increased, the heat-induced dissociation of these complexes results in a decrease in the quantum yield of electron transport at limiting light intensity, followed by a loss of electron transport activity at rate-saturating light intensity. The decreased quantum yield can be attributed to a block of excitation energy transfer from chlorophyll b to chlorophyll a, and changes in the distribution of the excitation energy between photosystems II and I. The block of excitation energy transfer is characterized by a loss of the effectiveness of 480 nm light (absorbed primarily by chlorophyll b) to drive protochemical processes, as well as fluorescence emission by chlorophyll b.

2 Present address: Biophysical Laboratory of the State University, Wassenaarseweg 78, Leiden, The Netherlands.

1 This work was supported by National Science Foundation Energy-related Postdoctoral Fellowship SMI76-17963 to P. A. A. and National Science Foundation Grant DEB 75-020640 to O. B. C.I.W.-D.P.B. Publication No. 608.




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