Dependence on Wavelength and Temperature of Growth Inhibition Induced by UV-B Irradiation

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Cotyledons excised from dark-grown seedlings of cucumber (Cucumis sativus L.) were cultured in vitro at 20℃ under visible and UV light. Various UV spectra were obtained by using a series of cut-off filters that had different transmittance properties. Growth of cotyledons was inhibited by irradiation at wavelengths shorter than 320 nm and was not affected by irradiation at longer wavelengths. The synthesis of Ch1 in the cotyledons was strongly inhibited by irradiation at 280-300 nm and slightly inhibited by irradiation at 300-320 nm. Inhibition induced by irradiation at 280-300 nm was not affected by temperature, but the extent of inhibition by irradiation at 300-320 nm was reduced at 25℃. This dependence on temperature of the effect of UV light was also observed in the inhibition of photosynthesis. These results indicate that the mode of inhibition by UV light at 280-300 nm may be different from that induced by UV light at 300-320 nm and that two or more mechanisms may be involved in the harmful effects of UV-B radiation.
日本植物生理学会の論文