Abstract
Several movement reactions of different plant species ( Triticum aestivum, Phaseolus vulgaris, Ph. coccineus and Bellis perennis) were studied with regard to their UVB sensitivity. The current investigations were based on the working hypothesis that low UVB levels, which do not induce direct damage, may affect these reactions in higher plants. UVB was found to impair phototropic and gravitropic reactions of shoots, photonastic reactions of leaf joints and the opening movements of inflorescences. UV radiation impaired growth responses as well as turgor reactions. In a subsequent white light period these UVB-induced inhibitions remained effective for hours.
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