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稻株喂养~(15)N标记的硫酸铵后,测定其第13叶片叶龄和吸收氮量的关系。叶片吸收氮素活性至叶片含氮量最高时就迅速下降。叶片转变衰老,叶片氮的含量已经开始下降时,~(15)N吸收量为叶片发育期间的28％。叶片中度衰老,当叶片含氮量降低到最高含量一半时,~(15)N的吸收为13％。用葡聚糖G-200型的凝胶过溶仪分析可溶蛋白质中~(15)N含量。在叶片生长期间,羧化酶丰富的部位其大量~(15)N被结合成二磷酸核酮糖。叶片衰老时,这个部位~(15)N量减少的速度要比其他部位更为迅速,尤其是呈严重衰老的叶片,这个
After the rice plants were fed with ~ (15) N-labeled ammonium sulfate, the relationship between the 13th leaves leaf age and nitrogen uptake was determined. Leaf absorption of nitrogen activity to the leaf nitrogen content is rapidly decreased. When the leaves changed senescence and the content of nitrogen in the leaves began to decline, the absorption of ~ (15) N was 28% during leaf development. Leaf moderate aging, when the leaf nitrogen content reduced to half the maximum content, ~ (15) N absorption of 13%. The content of ~ (15) N in soluble protein was analyzed with a dextran G-200 gel-dissolver. During leaf growth, a large amount of ~ (15) N is bound to ribulose bisphosphate in the carboxylase-rich region. Leaf senescence, this part of ~ (15) N decreased more rapidly than other parts of the speed, especially the leaves are severely aged, this