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Interaction of UV-A, UV-B, and Visible Radiation on Growth, Composition, and Photosynthetic Activity in Radish Seedlings

  • W. Iwanzik
Conference paper
Part of the NATO ASI Series book series (volume 8)

Abstract

Radish (Raphanus sativus L., cv. Saxa Treib) seedlings were continuously irradiated in a factorial design with UV-A, UV-B, and visible radiation. Plant growth, measured in terms of changes in fresh weight, was markedly reduced in all treatments where UV-B radiation was present, and especially when unfiltered radiation was employed, allowing small amounts of UV-C radiation to reach the plants. Simultaneously applied UV-A radiation did not improve growth: whereas the addition of white light to UV-A and UV-B radiation increased fresh weight. Anthocyanin and flavonoid production were affected in an opposite manner to fresh weight. UV-A radiation was not effective in inducing anthocyanin and flavonoid biosynthesis; whereas UV-B radiation produced increasing amounts of these pigments with increasing UV-B irradiance. The induction of flavonoid synthesis seemed to be more sensitive to UV-B radiation than that of anthocyanins. Soluble proteins were similarly affected.

Photosynthetic activity, measured in terms of variable fluorescence, was decreased by UV-B radiation; whereas UV-A radiation had no effect. The concentration of photosynthetic pigments (chlorophylls and carotenoids), however, was not affected by any of the treatments with UV-B radiation, suggesting that the primary photochemistry of chloroplasts was influenced by UV-B radiation.

It is concluded from the results in this study that UV-A radiation neither attenuates nor amplifies the UV-B-induced effects.

Keywords

Photosynthetically Active Radiation Spectral Energy Distribution Variable Fluorescence Radish Seedling Radish Cotyledon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • W. Iwanzik
    • 1
  1. 1.Universität KarlsruheFederal Republic of Germany

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