一个玉米F_(2:3)群体主要性状的变异及相关分析

Variation and Correlation Analysis of Main Traits in the Maize F_(2:3) Population

用自交系201与698-3杂交,创建了一个玉米F2:3群体,共233个家系。分析了该群体的穗长、秃尖长、穗粗、穗行数、行粒数、粒深、百粒重、出籽率和单株生产力等9个性状的变异及其相关性。结果表明,这些性状的变异度均很大,在不同家系间存在极显著的差异;除秃尖长外,频率分布均呈正态分布。各性状与单株生产力之间都存在极显著的相关关系,其中行粒数、百粒重、穗行数、粒深和出籽率对单株生产力的贡献最大。利用该群体中的变异性状,结合性状之间的相关性进行选择,可选育出新的高产玉米自交系。

A maize F2：3 population with 233 families were obtained from a hybrid cross of the maize inbred line 201 × 698-3. The variation and their correlation of nine diameter, rows per ear, kernels per row, kernel depth, characters, including ear length, barren tip length, ear 100-kernel weight, kernel rate and yield per plant were analyzed. The results indicated that these traits were significantly different among families with great variations, and their frequency distributions were normal distributed except barren tip length. There were significant （P〈0.01） correlation between yield per plant and other traits, in which kernels per row, 100-kernel weight, rows per ear, kernel depth and kernel rate had the most important contribution to the yield per plant. By using the variable characters in the population, along with selection according to their trait correlation, it is possible to breed some new high yield maize inbred lines.