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本文初步探讨了亚种间杂交稻抽穗期与结实率的关系.结果表明,亚种间杂交稻不同抽穗期的千粒重和结实率的变异幅度大于品种间杂交稻.即亚种间组合千粒重和结实率受气候条件的影响比品种间组合要大.不论品种间组合,还是亚种间组合二次枝梗的千粒重和结实率的变异幅度大于一次枝梗的千粒重和结实率.两类杂交组合的结实率都随气温的升高而降低,但是亚种间组合比品种间组合暗期更耐高温.
In this paper, the relationship between heading date and seed setting rate of inter-subspecific hybrid rice (Oryza sativa L.) was preliminarily discussed.The results showed that the variation of 1000-grain weight and seed setting rate at different heading stages of intersubspecies hybrid rice was greater than that of hybrid rice, The rate of climatic conditions was greater than the combination between cultivars.The variation of 1000-grain weight and seed-setting rate of the secondary branchlets between the inter-species combinations or subspecies was greater than that of the primary branchlets. The seed setting rate decreased with the increase of temperature, but the inter-subspecies combinations were more resistant to high temperature than the combination of different breeds.