水稻穗部性状与产量的关系

目的]研究水稻穗部性状与产量形成的关系。方法]以36个水稻品种为材料，田间试验采用随机区组设计，分别测定抽穗期叶面积指数，成熟期穗茎角，穗长、一次枝梗数、二次枝梗数、每穗成粒数、空秕粒数、千粒重等穗部性状，研究水稻穗部性状之间的关系及其与产量、产量构成因素、源库等之间的关系。结果]每穗颖花数、一次枝梗数、二次枝梗数、着粒密度之间呈极显著或显著的正相关，二次枝梗数对增加每穗颖花数和着粒密度的作用较大。着粒密度与穗茎角、穗长呈二次曲线关系。穗茎角、穗长与产量呈极显著负相关。着粒密度、粒叶比与产量呈抛物线关系，当着粒密度为9—12粒／cm、粒叶比在1．1—1．2粒／cm^2时水稻产量较高。结论]该研究为水稻理想株型育种提供理论依据。

Relationship between Ear Characters and Yield in Rice

Objective] The purpose was to study the relationship between ear characters and yield formation in rice.Method] With 36 rice varieties as tested materials,the randomized block design was used in field experiments.Some ear characters such as leaf area index in heading stage,panicle angle in mature stage,ear length,primary rachis branches and secondary rachis branches,seeds per panicle,unfulfilled grains and 1 000-grain weight were determined to study the relationships among ear characters and the relations...