Effects of ultraviolet–B irradiances on soybean

Publisher Website
Google Scholar
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.