大穗型杂交水稻穗部性状及其影响

通过对几个大穗型杂优组合的穗部性状分析研究结果表明：一次枝梗数/二次枝梗数比例高的大穗型组合易形成高产。其原因主要在于一次枝梗着粒的千粒重高于二次枝梗着粒的千粒重，一次枝梗着粒的结实率高于二次枝梗着粒的结实率；并且其库源关系协调，粒/叶、实粒/叶、实粒重/叶均较高。提出以选育穗长较长、一次枝梗发达、着粒密度较稀的大穗组合来实现高产的育种策略。

Study on the Panicle Characters of Several Large Panicle Hybrid Rice Combinations and Their Effects on Yield

Three new large-panicle type hybrid rice combinations Teyou70,Gang501，Teyou124 were used to study the large-panicle character and its influence on other yield characters. Results showed that the yield of the large panicle combination was higher when the combination's rate of primary branches and secondary branches was higher. Because the setting percentage and 1000-grain weight in the spilekets on primary branches are higher than those on secondary branches, and its grain sink was coordinated to source with more spilekets、more setting spikelets and more setting spileketes weight per unit leaf area. Additionally, it was pointed that it would be easier to get higher yield rice combination by selecting the characters of longer panicle length, more primary branches and lower grain density.