Analysis of Combining Ability on the Main Agronomic Traits of Several Indica Three-lines Hybrid Rice Parents
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摘要: 以5个籼型水稻不育系为母本和5个恢复系为父本, 通过不完全双列杂交试验设计, 对其主要农艺性状的配合力、遗传力进行分析。结果表明:株高、有效穗、穗总粒数、结实率、千粒重、单株谷重主要受加性效应的影响;亲本各性状一般配合力和特殊配合力之间并没有明显的关系;父本对有效穗、穗总粒数、结实率、千粒重、单株谷重的贡献大于母本, 而母本对株高的贡献大于父本。6个主要农艺性状的狭义遗传率千粒重>株高>结实率>穗总粒数>有效穗>单株谷重。Abstract: The combining ability and heritability of hybrid rice parents, were estimated to provide an important theoretic foundation for breeding of hybrid rice parents and combinations.Five indica sterile lines were crossed with five indica restoring lines by incomplete dialle cross design.The six main agronomic traits of their F1 were analyzed to estimate their combining ability and heritability of hybrid rice parents.The results showed that plant height, effective panicle, grain number per panicle, seed setting rate, 1000-grain weight and yield per plant were affected by the additive effect mainly.There was no significant corresponding relationship between general combining ability and specific combining ability of different characters of hybrid rice parents.The effect of the male parent on effective panicle, grain number per panicle, seed setting rate, 1000-grain weight and yield per plant was higher than that of the female parent, while the effect of the female parent on plant height was higher than that of the male parent.Narrow heritability of the six main agronomic traits was 1000-grain weight>plant height>seed setting rate>grain number per panicle>effective panicle> yield per plant.
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