水稻叶色突变体的稻米理化品质和配合力分析

 利用300 Gy 60Co-γ射线辐照籼型保持系龙特甫B和Ⅱ32B，获得了多种类型的叶色突变体（分别记为LBn和ⅡBn）。对其中的13个LBn和7个ⅡBn的稻米理化品质测定结果显示，LBn的表观直链淀粉含量（AAC）、碱消值（ASV）和胶稠度（GC）与亲本差异不显著。但淀粉粘滞特性（RVA谱）变异较大。而在ⅡBn中，ⅡB11的AAC、ASV和GC与亲本Ⅱ32B有极显著差异；ⅡB9的GC也与亲本差异极显著。ⅡB11和ⅡB9的RVA谱也与Ⅱ32B存在差异。配合力分析表明，由突变体LB3和ⅡB2转育而成的带叶色标记不育系LA3和ⅡA2的配合力与各自的亲本相仿。

Physical and Chemical Quality Characters and Combining Ability of Leaf Color Mutants of Rice

Leaf color mutant lines, designed as LBn and ⅡBn, respectively, were obtained from the mutated progenies of two cytoplasmic male sterile (CMS) maintainers Longtefu B and Ⅱ32B, of which the dried seeds were treated with 300 Gy ⁶⁰Co-γ rays. It was found that all 13 lines of LBn had similar apparent amylose content (AAC), alkali spreading value(ASV) and gel consistency (GC) to their parental variety, respectively. The starch paste characters (RVA profiles) of the 13 mutant lines were markedly different from that of their parent Longtefu B. However, the AAC, ASV and GC of ⅡB11 was significantly different from those of Ⅱ32B, and so of the GC of ⅡB9. The RVA profiles of ⅡB9 and ⅡB11 were different from those of Ⅱ32B to some extent. Test of F 1 hybrid performance showed that LA3 and ⅡA2, derived from leaf color mutant lines LB3 and ⅡB2, respectively, had excellent combining ability similar to their corresponding parents.