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Plant Physiology 92:141-146 (1990)
© 1990 American Society of Plant Biologists

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Environmental and Stress Physiology

Field Study of the Interaction between Solar Ultraviolet-B Radiation and Drought on Photosynthesis and Growth in Soybean 1

Joe H. Sullivan and Alan H. Teramura

Department of Botany, University of Maryland, College Park, Maryland 20742

Soybean, Glycine max (L.) Merr. cv Essex, plants were grown in the field in a 2 x 2 factorial design, under ambient and supplemental levels of ultraviolet-B (UV-B) radiation (supplemental daily dose of 5.1 effective kilojoules per square meter) and were either well-watered or subjected to drought. Soil water potentials were reduced to –2.0 megapascals by the exclusion of natural precipitation in the drought plots and were maintained at approximately –0.5 megapascal by supplemental irrigation in well-watered plots. Plant growth and gas exchange characteristics were affected under both drought and supplemental UV-B radiation. Whole-leaf gas exchange analysis indicated that stomatal limitations on photosynthesis were only significantly affected by the combination of UV-B radiation and drought but substrate (ribulose bisphosphate) regeneration limitations were observed under either stress. The combined effect of both drought and UV-B radiation on photosynthetic gas exchange was a reduction in apparent quantum efficiency and the rapid appearance of biochemical limitations to photosynthesis concomitant with reduced diffusional limitations. However, the combination of stresses did not result in additive effects on total plant growth or seed yield compared to reductions under either stress independently.

1 This work was supported in part by the U.S. Environmental Protection Agency's Environmental Research Laboratory in Corvallis, OR (CR 812 150-02-0), Scientific Article No. 8044, Contribution No. A-4997 of the Maryland Agricultural Experiment Station. Although the work described in this article was funded in part by the U.S. Environmental Protection Agency, it has not been subjected to the agency's peer and policy review. It therefore does not necessarily reflect the views of the agency and no official endorsement should be inferred.




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Copyright © 1990 by the American Society of Plant Biologists