江西农业学报Issue(8)：4-8,5.
花期弱光胁迫对玉米穗粒数的影响
Effect of Low Light Stress at Flowering Stage on Kernel Number per Ear of Maize
摘要
Abstract
In order to explicit the effect of low light at flowering stage on the kernel number per ear of maize,we simulated low light stress through artificial shading,conducted two shading rate(60%,90%)treatments for continuous 10 days at initial tasseling stage and at silking stage,and studied the effects of low light at flowering stage on the fertilization and seed setting of florets on fe-male ears,as well as the accumulation of dry matter and its distribution to female ears. It was found that low light stress at flowering stage led to the decrease in daily weight gain of aboveground total dry matter,the reduction in distribution proportion of dry matter to female ears,the slowing of female ear growth,and the decline in rate of fertilization and seed setting;the influence of low light en-larged when the shading rate increased. Compared with the floret fertilization rate at the end of both 60% and 90% shading rate treatments at initial tasseling stage,the final seed setting rate was markedly increased. While in comparison with the floret fertiliza-tion rate at the end of both 60% and 90% shading rate treatments at silking stage,the final seed setting rate was decreased or simi-lar. The final kernel number per ear of maize was decreased by 57% ~91% and 43% ~81% due to the light insufficient at initial tasseling stage and at silking stage,respectively. The daily average photosynthetically active radiation intensity in shading treatment period of both initial tasseling stage and silking stage had the greatest effect on the formation of kernels,followed by daily weight gain of aboveground total dry matter in shading treatment period. The daily average temperature in shading treatment period of silking stage also had directly positive effect on the kernel number per ear of maize.关键词
玉米/光合有效辐射/花期/弱光胁迫/穗粒数/连阴雨Key words
Maize/Photosynthetically active radiation/Flowering stage/Low light stress/Kernel number per ear/Continuous cloudy and rainy days分类
农业科技引用本文复制引用
王秀萍,成林,刘荣花..花期弱光胁迫对玉米穗粒数的影响[J].江西农业学报,2014,(8):4-8,5.基金项目
中国气象局·河南省农业气象保障与应用技术重点开放实验室研究基金项目（AMF201208）；国家自然科学基金项目（U1304405）；公益性行业（气象）科研专项（GYHY201406026）。 （）
