Effects of ultraviolet–B irradiances on soybean |
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Authors: | ALAN H TERAMURA |
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Institution: | Department of Botany, Duke University, Durham, N.C. 27706 |
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Abstract: | Soybean Glycine max (L.) Merr. cv. Hardee] and wheat (Triticum aestivum L. cv. Jori) were grown from seed under four ultraviolet-B irradiances and four levels of photosynthetically active radiation in a factorial design. The effects of ultraviolet-B radiation on leaf number and area, total dry matter production, dry weight of component organs, and plant height were compared between soybean and wheat. Ultraviolet-B radiation effects were dependent upon the level of photosynthetically active radiation incident during growth. Wheat and soybeans were both affected by low ultraviolet-B radiation flux densities; however, they differed markedly in their growth responses and biomass allocation patterns. Substantial interactions between ultraviolet-B and photosynthetically active radiation indicate a need for the measurement of longer wavelength radiation when evaluating the effects of ultraviolet-B radiation on plant growth in natural conditions. |
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Keywords: | Ultraviolet radiation soybean wheat ozone reduction photoreactivation photorepair |
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