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KMID : 1024519960050050635
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Journal of the Environmental Sciences
1996 Volume.5 No. 5 p.635 ~ p.642
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Effects of UV-B radiation on carotenoids, polyamines and lipid peroxidation in rice (Oryza sativa L.) leaves
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Kim Hak-Yoon
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Abstract
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Rice plants, cv. Koshihikari, were subjected to the biologically effective ultraviolet-B(UV-BBE) radiation {daily dose : 0.0 (control) and 11.5 (enhanced UV-B) KJ m-2} to investigate the effect of enhanced UV-B radiation on lipid peroxidation and to determine whether carotenoids and polyamines are involved in protection mechanism against enhanced UV-B radiation. Enhanced UV-B radiation significantly depressed plant dW weight. Malondialdehyde (MDA) content in rice leaves was increased by about 30% after 6 days of UV-B irradiation. Total carotenoid contents tended to slightly decrease with the UV-B irradiation, even though there was no significance. In rice leaves, 3 major polyamines, putrescine, spermidine and spermine are observed. All of the polyamine contents were increased with UV-B irradiation. The results suggest that enhanced UV- B radiation caused oxidative stress on lipids and that polyamines may serve as a biochemiral protectant against increased UV-B radiation in rice plants.
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KEYWORD
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carotenoid, malondialdehyde (MDA), polyamine, rice (Oryza stativa L.), ultraviolet-B radiation
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