...量为叶片、茎鞘、穗轴和颖壳以及籽粒氮积累量的总和，即包括植株氮积累量（PNA）和籽粒氮积累量（grain nitrogen accumulation，GNA）两部分，因此，此时段内的ANA等于PNA与GNA的和（ANA=PNA+GNA）。
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The dynamic change in grain nitrogen content showed a V shape, and S shape in nitrogen accumulation.
籽粒氮含量变化呈“V”型曲线，籽粒氮素积累呈“S”型。
Therefor, the different accumulation and remobilization pattern of carbon and nitrogen in vegetative organs may be one of the major reasons for different grain protein and starch contents.
因此，营养器官碳、氮积累与分配的差异可能是小麦籽粒蛋白质和淀粉含量差异的重要原因之一。
Total nitrogen accumulation amount of CMS lines was distinctly higher than their homotypic lines (P<0.05), with more nitrogen distributed to stalk and grain in CMS lines.
CMS玉米氮素积累总量高于其同型可育系（P<0.05），成熟期氮素在茎秆和籽粒中分配较多；
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