Changes in Grain Size and Grain Storage Protein of Rice (Oryza Sativa L.) in Response to Elevated UV-B Radiation under Outdoor Conditions

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  • HIDEMA Jun
    Department of Environmental Life Sciences, Graduate School of Life Sciences, Tohoku University
  • ZHANG WunHui
    Department of Crop Science, Graduate School of Agricultural Science, Tohoku University
  • YAMAMOTO Mitsuru
    Department of Environmental Life Sciences, Graduate School of Life Sciences, Tohoku University
  • SATO Tadashi
    Department of Environmental Life Sciences, Graduate School of Life Sciences, Tohoku University
  • KUMAGAI Tadashi
    Department of Environmental Life Sciences, Graduate School of Life Sciences, Tohoku University

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Abstract

Variation in growth, grain size and grain storage protein content of rice (Oryza sativa L.) in response to elevated UV-B radiation under sunlight was examined in a cool rice-growing region of Miyagi Prefecture, Japan, in 1999, 2001 and 2002. Tiller number, dry mass, panicle number, grain yield and grain size significantly decreased under elevated UV-B radiation in 2001 and 2002. The effects of elevated UV-B radiation on the reduction of each growth parameter were greatly enhanced by daily lower temperature during the ripening stage in those two years. On the contrary, total grain nitrogen content and grain storage protein content significantly increased under elevated UV-B radiation in 2001 and 2002. Among grain storage proteins, glutelin content significantly increased but albumin-globulin and prolamin contents did not. It was thus evident that not only grain size but also grain storage protein of rice was markedly influenced due to elevated UV-B radiation.<br>

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