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一供试品种为盐粳2号。盆钵土培。整株标志~(14)CO_2同化后24h取样,测定叶片、叶鞘、节间、穗轴、穗上、中、下部1.2次枝梗及其各粒位籽粒的含水率、标志物质放射性强度等。结果表明:全穗籽粒平均含水率为44.32％和19.65％时,分别有68.48％和1.07％的标志光合产物运转到籽粒:单位绿叶重固定~(14)CO_2的能力,籽粒含水率19.65％时不到44.32％时的1/3;籽粒含水率下降到20％及以下时,枝梗内含有大量标志光合产物,其中7365％-91.04％是可溶性糖,而籽粒中几乎没有标志光合产物,说明此时籽粒已丧失了受容灌浆物质的能力;籽粒含水率与淀粉合成速率呈单峰偏态曲线,籽粒含水率在45％左右时,淀粉合成速率最大,以后随籽粒含水率的降低迅速下降。
A test varieties for salt japonica 2. Pot soil cultivation. (14) 24 h after CO 2 assimilation, the water content and the radioactive intensity of the flag grains in the leaves, leaf sheaths, internals, rachis, panicle, middle and lower parts of the leaves were measured. The results showed that the average photosynthetic rate of 68.48% and 1.07% of the total photosynthetic products were 44.32% and 19.65%, respectively. When transplanted into the kernels, the unit leaf capacity of 14% CO_2 and the grain moisture content of 19.65% Less than 1/3 of 44.32%. When the water content of grain dropped to 20% and below, the branch stem contained a large number of labeled photosynthate, of which 7365% -91.04% were soluble sugars, and there were almost no photosynthetic products in grain At this time, the grain had lost its ability to be subjected to the grouting material. The grain moisture content and the starch synthesis rate showed a monomodal skewed curve. When the grain moisture content was about 45%, the starch synthesis rate was the highest, and then decreased rapidly with the decrease of grain water content.