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Plant Physiology 74:161-166 (1984)
© 1984 American Society of Plant Biologists

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Articles

Acclimation of Photosynthesis to Low Leaf Water Potentials 1

Mark A. Matthews2 and John S. Boyer

Department of Agronomy, University of Illinois, Urbana, Illinois 61801, Department of Botany, University of Illinois, Urbana, Illinois 61801, United States Department of Agriculture/Agricultural Research Service, Urbana, Illinois 61801

Photosynthesis is reduced at low leaf water potentials ({Psi}l) but repeated water deficits can decrease this reduction, resulting in photosynthetic acclimation. The contribution of the stomata and the chloroplasts to this acclimation is unknown. We evaluated stomatal and chloroplast contributions when soil-grown sunflower (Helianthus annuus L.) plants were subjected to water deficit pretreatments for 2 weeks. The relationship between photosynthesis and {Psi}l, determined from gas-exchange and isopiestic thermocouple psychometry, was shifted 3 to 4 bars towards lower {Psi}l, in pretreated plants. Leaf diffusive resistance was similarly affected. Chloroplast activity, demonstrated in situ with measurements of quantum yield and the capacity to fix CO2 at all partial pressures of CO2, and in vitro by photosystem II activity of isolated organelles, was inhibited at low {Psi}l but less in pretreated plants than in control plants. The magnitude of this inhibition indicated that decreases in chloroplast activity contributed more than closure of stomata both to losses in photosynthesis and to the acclimation of photosynthesis to low {Psi}l.

2 Present address: Department of Viticulture and Enology, University of California-Davis, Davis, CA 95616.

1 Supported in part by National Science Foundation Grant PCM 79-09790 to J. S. B.




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Copyright © 1984 by the American Society of Plant Biologists