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杂交水稻粒叶比性状具有较大的遗传变异系数，其中颖花叶比同时受加性和非加性基因控制，而实粒叶比、粒重叶比主要受非加性基因控制。三性状广义遗传力较高，但狭义遗传力较低。颖花叶比与单株颖花数、实粒叶比和粒重叶比与单株实粒、结实率及单株粒重均呈极显著正相关。实粒叶比和粒重叶比可能由同一基因系统控制。1103s、培矮64s和J413是改良实粒叶比和粒重叶比的优良亲本。
The grain-leaf ratio trait of hybrid rice had larger genetic variation coefficient, and the ratio of spikelet-leaf ratio was controlled by additive and non-additive genes at the same time. The ratio of grain-to-leaf ratio and weight to leaf ratio was mainly controlled by non-additive genes. Three traits broad genetic heritability, but the narrow sense of heritability. The ratio of spikelet to spikelets per plant, grain-to-grain ratio and grain-to-leaf ratio were significantly and positively correlated with grains, seed setting rate and grain weight per plant. Real grain ratio and grain weight ratio may be controlled by the same gene system. 1103s, Pei’ai 64s and J413 were excellent parents with improved grain-to-grain ratio and grain-to-grain ratio.