水稲の高温稔実障害に関する研究 : 第4報稔実初期の^<14>C同化産物の転流に及ぼす高温の影響

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The effects of high temperature (day-night, 35-30℃) upon photosynthesis and assimilate translocation to panicle were investigated by application of ^<14>C0_2 to the whole plant at several ripening stages. 1) Translocation rate of ^<14>C-assimilates into panicle was very low at 25-2O℃, leaving much ^<14>C in the straw. Rising night temperature to 25゜(25-25℃) increased the rate equivalent to those at 35-35℃ and 35-30℃. Therefore, a great difference was found in the translocation rate between daily mean temperature of 25゜(25-25℃ and 2325-20℃). 2) At high temperature, ^<14>C assimilated at an early ripening stage was found one week later in grains as mueh as 80% of total shoot ^<14>C, but that assimilated two weeks after flowering remained much in the straw with a decreased amount in the grains. At outdoor natural temperature, one the contrary, the percentage of ^<14>C found in the grains progressively increased as the ripening stage at which ^<14>C was assimilated advanced until two weeks after flowering. 3) At high temperature, ^<14>C assimilated at an early ripening stage translocated uniformly to all grains, but that assimilated two weeks after flowering moved little or much in the grains of upper or lower part of a panicle, respectively. Under outdoor condition, ^<14>C assimilated at an early ripening stage moved much to the upper grains with a little accumulation in the lower grains. Thereafter it moved equally to all grains and still accumulated in upper or early flowered grains even at two weeks after flowering. 4) Just after ^<14>C_2 application for half an hour, 90% or 80% of total ^<14>C assimilated were contained in ethanol-soluble fraction in leaf-blade or leaf-sheath plus stem, respectively. 0ne week after ^<14>C_2 application, however, much of ^<14>C was found in ethanol-insoluble fraction in straw, especially so in leaf-blade. This tendency was little changed by temperature or ripening stage. In the grains, less ^<14>C was found in ethanol-insoluble fraction at high temperature than at normal temperature. When ^<14>C was applied at a middle ripening stage, the less ^<14>C accumulation was found in starch and protein fraction at high temperature as compared with that at normal temperature, especially so in the lower grains of a panicle. 5) There was little difference in apparent photosynthesis between the plants ripened at high and normal temperatures as long as being deduced from ^<14>C assimilation
日本作物学会の論文
1976-03-30

水稲の高温稔実障害に関する研究 : 第4報稔実初期の^<14>C同化産物の転流に及ぼす高温の影響

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水稲の高温稔実障害に関する研究 : 第4報 稔実初期の^<14>C同化産物の転流に及ぼす高温の影響

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水稲の高温稔実障害に関する研究 : 第4報稔実初期の^<14>C同化産物の転流に及ぼす高温の影響