以4个不同氮效率玉米品种为试验材料，对其吐丝前后氮累积量和氮转移的基因型差异进行分析。结果表明，吉单209耐低氮能力较强；四密25对增施氮肥反应敏感，增施氮肥后增产幅度较大，表现出明显的喜氮特性。吐丝之后氮累积量较少的基因型，其相应的产量也较低。高产品种的选育应侧重花后氮素吸收，同时对于现有高产品种也应侧重花期氮肥的追施。

In order to evaluate the genotypic difference of nitrogen accumulation and translocation around silking, an experiment was carried out, taking four hybrid maize cultivars with different nitrogen efficiency. The result indicated that the tolerance to low nitrogen stress of JD209 was higher than other cultivars. SM25 was more sensitive with the increasing of nitrogen input and the grain yield increased after application of N fertilizer. The genotype with low N accumulation had lower grain yield. The breeding with higher grain yield should be emphasize particularly the N accumulation after flowering and the high-yield varieties also should be emphasize particularly the application N fertilizer after flowering.

国家重点基础研究发展计划课题(2009CB118601)、国家科技支撑计划课题(2011BAD16B10)