以19个测交种为供试材料，在两种种植密度下评价其根拔拉力及产量构成。结果表明，19个测交种在不同密度下的根拔拉力具有显著基因型差异。依据各自对两个密度的反应程度，共划分为双高抗倒型、高密抗倒型、中密抗倒型、双低抗倒型4种类型，结合产量构成共筛选出4个高产抗根倒伏的候选基因型。相关分析表明，玉米根系垂直拉力抗性与其秸秆产量显著相关，且相关性随着密度增加而提高，而与子粒产量无关。

An experiment was conducted to evaluate the relationship of root lodging resistance and grain yield using 19 test-crosses under different plant density conditions. The result indicated that there was the significant difference among the genotypes under different plant densities. Nineteen test-crosses were divided into four types as double high root lodging resistance, root lodging resistance with high density, root lodging resistance with middle density, double low root lodging resistance. Four genotypes were selected as the candidate high grain yield with high root lodging resistance. There was the significant correlation between vertical root pulling resistance and stover yield and increase with plant density. But there was no significance with grain yield.

国家自然科学基金（31101611）；博士后科学基金（2012M51081）；吉林省青年科研基金（201201090）；科技支撑计划（2013BAD07B02，2011BAD16B10，2012BAD04B02）；吉林省科技支撑重大项目（20106025，20126026）