【摘要】 通过F₁、F₂、F₃代结实率比较以及F₂、F₃代结实率的相关分析,F₃株系的结实率变异情况分析认为:WCV参予籼粳杂交,在显著提高F₁、F₂代结实率的同时,对高结实率的选择效果以及结实率的稳定速度都明显强于籼粳单交组合。 F₃株系的株高和抽穗期变异情况分析表明:结实率之外的性状分离状况因控制该性状的遗传基础不同而有差别,简单基因控制的性状的稳定速度不一定会因WCV的参予而加快,而多基因控制的性状则可能因WCV的参予而使籼粳杂交后代的稳定速度加快。水稻（O. Sativa L.）广亲和性品种(又称“媒介品种”¹²,即与籼稻和粳稻杂交结实均正常的材料)在籼粳杂交育种中应用的设想提出之后^10,11,12,1,2,引起广泛的重视。Araki等（14,15）,黄永楷²,吴长明、王象坤等^5,6分别在遗传和应用方面进行了初步探索。结果表明WCV参予籼粳杂交后能在很大程度上提高籼粳交的后代结实率。并通过相关及遗传力的分析判断,早代选择高结实率有效,但F₂以后世代的表现究竟如何尚无人报道,这便是本文想探讨的问题之一。籼粳杂交育种的另一难关是后代性状分离严重,稳定时间长。目前克服这一困难的主要方法是不断选择,但育种年限很长_3,4,13,16。WCV参予籼粳杂交之后,能否在这方面有所突破,还未见有实验报道。本文利用F₃株系的结实率、株高和抽穗期等性状的变异状况,探讨WCV在这方面的作用。更多还原

【Abstract】 <ABSTRACT>Analysis of fertility of F₁, F₂, and F₃, correlation between F₂’s fertility and F₃’s fertility and variation of fertility of F₃ lines indicated that WCV could improve selective effect for high fertility and stable extent of offspring’s, with increasing significantly fertility of F₁ and F₂, as it was involved in indica-japonica cross. Analysis of variation of plant height and ear-date showed that seperative ranges of these characteristics were different because of their different genetic basis.Stable rate for characteristic controled by olig-gene could not speed up, and at those controled by poly-gene cold speed up as WCV was used.更多还原