【摘要】 穗部性状对于鲜食玉米育种具有重要意义,尤其是秃尖长度和籽粒大小。本研究采用不完全双列杂交NCⅡ设计,对5个甜糯双隐自交系17HN79、17HN84、17HN88、17HN97、17HN98的穗行数、穗行粒数、穗长、穗粗、秃尖长度及籽粒大小等6个穗部性状的一般配合力(GCA)和特殊配合力(SCA)及遗传率参数进行分析。结果表明:6个穗部性状的广义遗传率在65. 5%~97. 0%之间,狭义遗传率在29. 3%~64. 0%之间,穗长和籽粒大小主要由非加性基因作用为主,而穗粗、穗行数、穗行粒数和秃尖长度受加性基因作用为主。甜糯双隐自交系17HN98在穗长、穗行粒数、籽粒大小和减少秃尖长度方面表现较高的一般配合力相对效应,是具有较好鲜食玉米育种应用价值的甜糯双隐自交系。结合一般配合力、特殊配合力及穗部性状综合表现,筛选出17HN98/100、17HN98/107和17HN98/109三个表现突出的鲜食玉米杂交组合。更多还原

【Abstract】 Ear traits,especially the length of bald tip and grain size,are important for fresh-eating maize breeding. In this study,we analyzed the general combining ability( GCA) and special combining ability( SCA) and heritability parameters of six ear traits of five sweet-waxy double recessive inbred lines including 17 HN79,17 HN84,17 HN88,17 HN97 and 17 HN98 by using incomplete diallel crossing design. The results showed that the general heritability of six ear traits ranged from 65. 5% to 97. 0% and narrow heritability ranged from 29. 3% to 64. 0%. The ear length and grain size were mainly determined by non-additive genes,while the ear diameter,row number,grain number per row and bald tip length were mainly influenced by additive genes. The relative effects of GCA in sweet-waxy maize inbred line double recessive genotype 17 HN98 was with higher in terms of ear length,grain number per row,grain size and bald tip length reduction,and was a sweet-waxy double recessive inbred line with better breeding value. 17 HN98/100,17 HN98/107 and 17 HN98/109 were the outstanding fresh-eating maize hybrid combinations based on GCA,SCA and ear traits performance.更多还原