花期高温对不同玉米品种主要农艺形状和产量的影响

Effects of High Temperature at Florescence Stage on the Yield and Major Agronomic Characters of Different Maize Varieties

为了评价玉米杂交种的花期耐高温能力,利用智能温室模拟高温气象在玉米花期前后进处理,评价花期高温环境对阳光98等10个夏玉米杂交种的花期、植株性状与产量性状等指标的影响。结果表明,花期高温使玉米的株高、穗位高变高,抽雄期、吐丝期延后,雌雄间隔期变长,穗长、穗粗、穗粒数、穗粒重、成穗率、理论产量下降。综合不同玉米品种各性状的耐高温系数、高温处理的理论亩产和隶属函数值分析,漯玉336、阳光98、豫丰3358的花期耐高温能力强,郑单958、阳光99的花期耐高温能力较强,漯玉152、先玉335、漯玉151花期耐高温能力适中,漯玉164、漯玉167花期耐高温能力较弱。

In order to evaluate the ability of maize hybrids to withstand high temperature in flowering stage,the intelligent greenhouse was used to simulate the high temperature weather before and after the maize flowering stage,and the effects of high temperature environment in flowering stage on the flowering stage,plant characters and yield characters of 10 summer maize hybrids were evaluated.Results showed that the high temperature stress caused higher plant height and ear height,delayed period of stamen growth,prolonged the period of male and female separation,and decreased ear length,ear diameter,ear grain number,ear grain weight,fertility and theoretical yield.According to the analysis of high temperature tolerance coefficient,theoretical yield and subordinate function value of different corn varieties,Luoyu 336,Yangguang 98 and Yufeng 3358 showed the strongest ability of high temperature tolerance at flowering stage,followed by Zhengdan 958 and Yangguang 99,and Luoyu 152,Xianyu 335 and Luoyu 151 had moderate ability,Luoyu 164 and Luoyu 167 showed weaker ability of high temperature tolerance at flowering stage.