Relation between Leaf Age and Nitrogen Incorporation in the Leaf of the Rice Plant (Oryza sativa L.)
Relation between Leaf Age and Nitrogen Incorporation in the Leaf of the Rice Plant (Oryza sativa L.)
复制标题
水稻叶龄与叶氮吸收之间的关系（Oryza sativa L.）
DOI：
10.1093/oxfordjournals.pcp.a076431
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发表时间：
1982
影响因子：
4.9
通讯作者：
K. Ohira
中科院分区：
文献类型：
--
作者：
T. Mae;K. Ohira
用15N标记的硫酸铵处理水稻植株第13叶，研究了叶龄与叶片中氮素结合的关系。叶片中的氮素吸收活跃到叶片含氮量最高时，此后迅速下降。在衰老初期，当叶片含氮量开始下降时，15N的掺入量降至发育期间的28%。在衰老中期，当含氮量降至最大值的一半时，掺入量为13%。用Sephadex G-200凝胶过滤检测15N掺入可溶性蛋白质。在发育过程中，大量的15N被掺入富含核酮糖的二磷酸羧基酶部分。随着叶片的老化，15N在这一组分中的吸收比在其他组分中减少得更快。这一趋势在衰老后期更为明显。我们的结论是，叶片中合成的蛋白质的数量和种类与叶龄密切相关。
The relation between leaf age and the incorporation of nitrogen into the leaf was examined in the 13th leaf blade of the rice plant,Oryza sativaL., after feeding it15N-labelled ammonium sulfate. The incorporation of nitrogen into the leaf was active up to the maximum leaf nitrogen content; thereafter it decreased quickly. At the beginning of senescence, when the nitrogen content of the leaf had begun to decrease, the incorporation of15N decreased to 28% of the value during development. At the middle stage of senescence, when the nitrogen content had decreased to half the maximum, the incorporation was 13%.The incorporation of15N into soluble proteins was examined by gel filtration on Sephadex G-200. During development, large amounts of15N were incorporated into the ribulose bisphosphate carboxylase-rich fraction. As the leaf aged, the incroporation of15N into this fraction decreased more sharply than it did in other fractions. This tendency was more pronounced at the late stage of senescence. We concluded that the amounts and kinds of protein synthesized in a leaf are closely related to leaf age.