Effects of Temperature Treatments for Rice Plants before/after Heading Stages on Water Status of Ripening Seeds

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  • MIYAZAKI Masayuki
    Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University:Fukuoka Agricultural Research Center
  • ITO Yumena
    Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • NONG Thi Hue
    Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • ISHIBASHI Yushi
    Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • YUASA Takashi
    Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • IWAYA-INOUE Mari
    Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University

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  • 出穂前/後の温度処理が登熟過程のイネ種子の水分動態に及ぼす影響

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Abstract

We examined effects of different temperature treatments for rice plants before/after heading stages on water status of ripening seeds by nuclear magnetic resonance (NMR) relaxation times (T_1 and T_2). At 0 day after heading (DAH), the T_1 values of seeds grown at 30/30℃ (before/after heading stages, treated temperatures) and 30/25℃ were higher than those of 25/25℃ and 25/30℃. However, at 14 DAH, those values were less than that treated at 25/25℃ and the changes in T_1 of rice seed during an early ripening stage showed similar changes in water content suggesting T_1 values closely related to the quantity of water. The T_2 values showing less than 1 ms were observed at 30/30℃ and 30/25℃ treatments at 21 DAH, while those at 25/25℃ and 25/30℃ treatments were still over 20 ms and it sharply dropped to less than 1 ms at 28 DAH. These results indicated that the NMR relaxation times, T_1 and T_2, were useful diagnostic indicators for water status during seed ripening. Especially, free water in rice seeds at high temperature treatment after the heading stage remained for seven days longer than the treatment before the heading stage.

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