水稻籼、粳两亚种产量构成特点的剖析与比较

THE DISSECTION AND COMPARISION OF YIELD FORMATION FOR INDICA AND SINICA SUBSPECIES IN RICE

选取籼、粳稻品种各65个,用相关、逐步回归和通径分析法,研究其产量结构特点和最优产量结构模式,结果表明:在产量与其它性状的关系上,有一定差异,相似性系数为0.711。籼、粳稻的最优产量结构模式不同,在籼、粳稻产量构成中,穗数的作用最大,其次是穗重。本本还对水稻常规与超高产育种的策略作了讨论。

This paper is to study the yield formationaand to construct the best yield comstitutional models for indica and sinica subspecies of rice by the aid of correlation, stepwise regression and path analysis methods. Sixty-five typical varieties for each of the 2 subspecies were chosen to be used in this experiment. The comparision between the 2 subspecies was also made. The results indicated that: indica rice was similar to sinica rice in the relationship of grain yield to other characters and the resemblance coefficient was equal to 0.7ll^(##):the best yield constitutional model of indica rice was different, to some extent, ftom that of sinica rice, and the effect of panicle number was the bigest and that of single panicle weight was the second in the yield formation of both indica and sinica rice. The strategy in conventional and superior high-yielding breeding of rice was also discussed in this paper.