Abstract
Effects of near-UV, especially UV-A, irradiation from UV lamps on the growth and physiological activity of radish plants were investigated by growing plants in plastic frames covered with a poly(vinyl chloride) film that was opaque to solar UV radiation on the Earth's surface. The growth of radish plants was promoted by the UV-A radiation, and the promotion by UV-A radiation was associated with an increase in chlorophyll content and photosynthetic activities. Furthermore, nitrate reductase activities, levels of soluble protein, levels of vitamin C (ascorbic acid + dehydroascorbic acid) and levels of nicotinamide coenzymes (NAD(H) and NADP(H)) in leaves and in the so-called globe “root”, which includes stem tissue in radish plants, were also elevated by UV-A radiation. Taken together, these data suggest that promotion of plant growth by UV-A radiation involves the promotion of carbon and nitrogen metabolism in radish plants.
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