粳稻特殊广亲和系GC13的遗传分析及利用研究

Genetic Analysis and Utilization of a Japonica Rice SWCV GC13

粳稻品种GC13对亚种内亲和力弱 ,而对亚种间亲和力强 ,因此特称之为特殊广亲和系 (Specialwidecompatibilityvariety ,SWCV)。广亲和基因等位性和遗传规律研究结果表明 ,GC13的广亲和性主效基因效应明显 ,同时受微效基因修饰 ,与已知的S7、S9、S15三个育性基因位点之一等位。GC13可与培矮 6 4S等籼型光敏核不育系配组育成亚种间杂交稻 ;GC13是粳型恢复基因源 ,从其杂交后代中选育出的偏粳 (K′)型或偏籼 (H′)型通用恢复系GR2 0 9、GR2 2 0和GR2 38等 ,对“野败”、“矮败”等多种不育细胞质和培矮 6 4S等光敏核不育系具有强恢复性 ,配制出的“三系”或“二系”杂交稻具有高产潜力和利用前景。

Japonica rice GC13 was considered as a special wide compatibility variety (SWCV), because its compatibility was weak within subspecies and strong between subspecies. The result of genetic analysis of wide compatibility and allelism indicated that GC13 expressed an obvious effect of a major gene controlling wide compatibility, which may be modified by minor genes and be allelic to one of the locus S 7, S 9 or S 15 . GC13 could be combined inter-subspecifically with PGMS line Pei-ai 64S. GC13 is one of restorer gene donors of Japonica group, from which the restorer lines GR209, GR220 and GR238 were developed.