Genetics of resistance of Oryza sativa to increased UV-B radiation and its physiobiochemical characteristics

Abstract

Abstract: The results show that UV-B (280～330nm) radiation strongly affected the growth and development of rice (Oryza sativa) seedlings, and thus, induced dwarf plants, wilted leaves, decreased chlorophyll content and dry matter of individual plants, and even death. The response of different rice genotypes to UV-B radiation was quite different. Among the three tested rice cultivars (HR, M63 and Hr), HR had the best resistance to UV-B radiation. The genetic analysis indicates that the resistance of rice UV-B radiation was the quantitative genetic trait mainly controlled by recessive polygenes. The biochemical analysis demonstrates that the activity of protective enzymes in rice seedlings treated with UV-B radiation significantly increased within 0～3days, then decreased gradually, and the content of malondialhyde (MAD) consequently enhanced. The resistant cultivar HR had a higher activity of protective enzymes than sensitive Hr, but a lower extent of lipid peroxidation, implying that the protective enzymes played an important role in resistance to UV-B radiation.

Key words: Oryza sativa, UV-B radiation, Genetic analysis, Biochemical characteristics

Lin Wenxiong, Liang Yiyuan, Kilung Kim . Genetics of resistance of Oryza sativa to increased UV-B radiation and its physiobiochemical characteristics[J]. Chinese Journal of Applied Ecology, 1999, 10(1): 31-34.

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