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Effects of Ultraviolet-B Irradiances on Soybean

II. INTERACTION BETWEEN ULTRAVIOLET-B AND PHOTOSYNTHETICALLY ACTIVE RADIATION ON NET PHOTOSYNTHESIS, DARK RESPIRATION, AND TRANSPIRATION ¹

R. Hilton Biggs and Susan Kossuth

Department of Botany, Duke University, Durham, North Carolina 27706, Fruit Crops Department, University of Florida, Gainesville, Florida 32605

Soybean plants (cv. Hardee) were grown from seed under four ultraviolet-B radiation flux densities and four photosynthetically active radiation levels in a factorial design. Net photosynthesis, dark respiration, and transpiration were measured after 2 and 6 weeks of exposure. Effects of ultraviolet-B radiation were dependent upon photosynthetically active radiation levels. Ultraviolet-B radiation adversely affected net photosynthesis at low photosynthetically active radiation levels, but had little consequence at levels normally saturating photosynthesis in the field. Ultraviolet-B radiation affected both stomatal and nonstomatal resistances to carbon dioxide under low levels of photosynthetically active radiation. The present study demonstrates interactions between ultraviolet-B and photosynthetically active radiation.

¹ This research was supported by the United States Department of Agriculture/Agricultural Research Service contract 12-14-1001-979 to R. H. B. and National Science Foundation Grant DEB76-04150 to Dr. H. Hellmers for the Duke University phytotron. Florida Agricultural Experiment Station Journal Series No. 1367.

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