Influence of Low/High Temperature on Water Status in Developing and Maturing Rice Grains(Crop Physiology and Ecology)
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概要
- 論文の詳細を見る
Temperature limits productivity and kernel quality of rice grains. Water status of rice (Oryza saliva L. cv. Hinohikari) grains grown at 20, 25 and 30℃ was evaluated by NMR relaxation times (T_1 and T_2) in relation to kernel quality during the period of grain development and maturation. During milky and dough stages, 7 to 15 days after flowering (DAF), T_1 values of long and short fractions in rice grains grown at 20℃ slightly increased but those grown at 30℃ decreased markedly. In rice grains grown at 25 and 30℃, T_2 values of long and short fractions were about 100 and 10ms, respectively, until 22 DAF but rapidly decreased to about 1ms and 20μs, respectively, at 29 DAF (yellow-ripe stage). This means that these grains had free water until 22 DAF, but only loosely bound water and bound water thereafter. On the other hand, in the grains grown at 20℃, T_2 values of long and short fractions were about 100 and 10ms, respectively, until 29 DAF, indicating that free water was maintained for seven days longer than at higher temperatures. The grains grown at 30℃ had white-back kernels in 85% of them and no perfect kernels, while the grains grown at 25 and 20℃ had perfect kernels in 68 and 27% of them, respectively. In contrast, the grains grown at 20℃ had notched-belly kernels in 28% of them though the grains grown at 25 and 30℃ had only a few and no notched-belly kernels, respectively. The present study revealed that the changes in T_1 of rice grains closely related with the quantity of water until mid-mature stage, while T_2 was more sensitive diagnostic indicator for accumulation of dry matter and quality of kernels, which were influenced by low/high temperature stresses.
- 日本作物学会の論文
著者
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Iwaya-inoue Mari
Laboratory Of Crop Science Department Of Plant Resources Faculty Of Agriculture Kyushu University
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Ishibashi Yushi
Laboratory Of Crop Science Department Of Plant Resources Faculty Of Agriculture Kyushu University
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Molla Abul
Laboratory Of Crop Science Department Of Plant Resources Faculty Of Agriculture Kyushu University:de
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Iwanami Kenji
Laboratory Of Crop Science Department Of Plant Resources Faculty Of Agriculture Kyushu University
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Ishibashi Yushi
Laboratory Of Crop Science Department Of Plant Resource Graduate School Of Bioresource And Bioenviro
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Funaba Mitsugu
Laboratory of Crop Science, Department of Plant Resources, Faculty of Agriculture, Kyushu University
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Funaba Mitsugu
Laboratory Of Crop Science Department Of Plant Resources Faculty Of Agriculture Kyushu University:na
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