[关键词]
[摘要]
以引自美国和选自美国血缘的自交系为基础材料,组建玉米辽综群体。采用S1表型选择法、S1家系密植鉴定选择法、配合力选择法对玉米辽综群体进行3轮改良,系统评价8个改良群体的育种潜势。结果表明,S1家系密植鉴定选择法改良群体效果显著,且方便、实用。以密植鉴定选择法改良的群体辽综C3-3穗行数增加明显、产量性状GCA水平较高、育种潜力较大。以其为基础群体,运用S1密植选择法结合新种质导入进行后续两轮改良。从不同轮次的改良群体中陆续选育出了6个优良玉米自交系,组配出6个相应的玉米杂交种通过国家或省级审定,新品种累计推广面积122.5万hm2。
[Key word]
[Abstract]
Liaozong maize population was created from American germplasm as basic materials. Three circles of the improvement on Liaozong maize population were made by the methods of S1 phenotypic selection, S1 high-density selection, and combining ability selection. Breeding potential on the 8 populations had been evaluated systematically. The results showed that the S1 high-density selection method has gained a better result, which is characterized by its simple, convenient and functional method on pratical operation. Synthetic groups of Liaozong C3-3 were better on rows of ears, higher yield level(GCA) and great potential of breeding material. The method of S1 density selection was used for further two cycles improvements with new germplasm introduced into Liaozong C3-3. Six good hybrids from different cycle populations were approved by national or provincial maize cultivar registration board, which had been released with an acreage of 1.225 million hectares.
[中图分类号]
[基金项目]
国家“863”项目(2011AA10A103-5);辽宁省科技攻关计划项目(91201001,96201037,2001201001,2006201001,2011201018)