糯玉米自交系主要农艺性状配合力分析

按Griffing双列杂交方法Ⅳ对9个糯玉米自交系进行组配,将获得的36个杂交组合进行鉴定,对自交系的单株产量、株高、穗位高、穗长、穗粗、穗行数、行粒数、千粒重进行配合力分析和遗传参数估算。结果表明:组合间各性状的GCA和SCA均达极显著差异;主要性状的加性方差大于非加性方差,加性方差占基因型方差比例的大小顺序是株高>穗粗>千粒重>单株产量>穗位高>穗长>穗行数>行粒数;综合各性状表现,自交系YWL1、YWL7利用潜力最高。综合利用潜力较高的自交系大多是来自糯玉米起源中心的热带、亚热带玉米种质的自交系,说明来自糯玉米起源中心的热带、亚热带糯玉米种质的利用潜力高,而且地方糯玉米种质也具有相当的利用潜力,对我国糯玉米育种及糯玉米种质改良、扩增具有重要的指导意义。

Combining Ability Analysis of Waxy Corn Inbred Lines for Main Agronomic Characters

The combining ability and hereditary parameters of 9 waxy corn inbred lines(6 tropical or subtropical waxy corn inbred lines and 3 temperate waxy corn inbred lines) for main agronomic characters were analyzed. The 9 waxy corn inbred lines were crossed by Griffing IV design and the 36 crosses were evaluated in Kunming of Yunnan province. The results showed that the difference of general combining ability(GCA) and special combining ability (SCA) for yield per plant, plant height, ear height, ear length, ear diameter, number of rows per ear, number of kernels per row and thousand seed weight were highly significant. The variance of additive effect was higher than that of non-additive effect, the sequence of additive variance by genetic variance was plant height > ear diameter > thousand seed weight > yield per plant > ear height > ear length > number of rows per ear>number of kernels per row. The most potential inbred lines in Yunnan were YWL1 and YWL7. It could be concluded from the study that the promising inbred lines almost were either tropical or the subtropical germplasm from the provenance of waxy corn and the local cultural had potential for hybrid breeding. The study provided valuable information for enhancement and improvement of waxy corn germplasm.