以子粒产量的氮敏感指数和耐低氮系数为评价指标并结合株高和吐丝期等二级性状,对我国玉米育种与生产上重要的189份玉米自交系进行氮利用效率评价。分析结果表明,低氮与正常供氮条件下,子粒产量均存在极显著的基因型与环境差异,基因型差异是氮利用效率差异的重要原因之一。将正常供氮条件与低氮胁迫下的产量进行分析并结合株高和吐丝期等二级性状,鉴定出郑58、郑28、中106、7595-2和昌7-2等20份玉米自交系较耐低氮且二级性状更符合当前玉米育种需要。

Nitrogen sensitive index and nitrogen tolerance coefficient of grain yield as the evaluation index, and combined with second level traits such as plant height, anthesis to silking interval(ASI) to investigate the nitrogen use efficiency of 189 maize inbred lines, which were widely used in maize breeding and production in China. The variance analysis results showed that the grain yield was significantly difference of genotype and environment in both the low and normal nitrogen treatments. The genetic variance was one of the most important reasons of the difference in nitrogen sensitivity among inbred lines. Based on analyzing the yielding data, plant height and silking day information of maize inbred lines, twenty inbred lines such as Zheng 58, Zheng 28, Zhong 106, 7595-2 and Chang7-2 were identified as highly low-nitrogen resistant materials.

国家自然科学基金项目(31361140364)、国家农业科技成果转化项目(2013GB2C300202)