摘要
根据已有的SSR分子标记对48个杂交籼稻亲本杂种优势群的划分结果,采用完全双列杂交设计和分群比较法研究了从不同类群选出的14个代表亲本相互杂交组合F1的杂种优势表现。结果表明,利用分子标记划分的4个杂种优势群及6个亚群之间存在遗传差异并构成28种可能的杂种优势模式。目前我国杂交籼稻杂种优势利用的主要模式如明恢63亚群×保持系群模式、两系恢复系亚群×保持系群模式仍然表现突出,而保持系群×温敏核雄性不育系群有可能成为新的杂种优势利用模式;两系恢复系和其他类型亲本杂交均能产生较强的杂种优势,定向改良后可能会提高籼稻杂种优势利用水平。
According to the grouping result of 48 parental lines by SSR analysis, the heterosis among 14 parental lines selected from 48 parents was studied by a set of diallel crosses and an analysis method of independent comparison of single degree of freedora. The results indicated that there were genetic difference among thermo-sensitive genic male sterile line group and 9308, Zhenshah 97 sub-group, Xieqingzao sub-group, exotic sub-group, Minghui 63 sub-group, IR24 sub-group and two-line restorer line sub-group by F1 heterosis analysis. These heterotic groups or sub-groups could constitute 28 kinds of potential heterosis patterns. The heterosis patterns of Minghui 63 sub-group × maintainer line group and Zhenshan 97 sub-group× two-line restorer line subgroup, widely used in hybrid rice production exhibited a higher degree of heterosis. The combinations crossed by the heterosis pat- tern of maintainer line group × thermo-sensitive genie male sterile line group also showed considerable hcterosis, this new heterosis pattern could be promising. The combinations from heterosis patterns related to two-line restorer line sub-group were outstanding in grain yield, though most of these patterns could not be used directly in production, these two-line restorer lines would play an important role in promoting hybrid rice breeding after being directionally enhanced.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2007年第1期14-18,共5页
Journal of Nanjing Agricultural University
基金
长江学者及创新团队发展计划
关键词
杂交籼稻
分群比较
杂种优势群
杂种优势模式
indiea hybrid rice
independent comparison of single degree of freedom
heterosis group
heterosis pattern
