四川省玉米杂交种综合评价及主要农艺性状的关联度分析

Grey Correlation Degree Analysis on Yield and Main Agronomic Characters of Maize Hybrid in Sichuan Province

利用灰色关联度分析的方法,对四川省玉米区试2005年平丘1～4组参试的40个玉米新组合及相应对照分组进行综合评价。结果表明:玉米杂交种产量与其主要农艺性状的关联度大小顺序为:单穗粒重>株高>穗位高>出籽率>穗长>适应度>穗行数>百粒重>抗倒伏>CV值>生育期>行粒数,与产量密切相关的性状是单穗粒重、株高、穗位高、出籽率和穗长等。选育玉米杂交种时,在保证适当的株高和穗位高的前提下,要注重单穗粒重、出籽率、适应性、长穗和多行的选择,同时不要忽略百粒重和抗倒性的选择。

The influence of twelve main agronomic characters on yield of 40 new varieties and CK in the corn regional test in Sichuan in 2005 was studied with the analysis of grey correlation degree. The results showed that the magnitude on effects of vary characters on the yield in turn was grain weight per plant, plant height, ear height, kernel rate, ear length, degree of adaptability, rows per ear, 100-kemel weight, lodging resistance, CV, growing period and kernel per row. It indicated that in the course of breeding, we should pay attention to the selection of grain weight per plant, kernel rate, degree of adaptability, ear length, rows per ear with suitable plant height and ear height,and shouldn＇t ignore the selection of 100-kernel weight and lodging resistance.