不同穗型水稻产量与群体生理性状的关系

根据穗倾角穴穗颈节至穗尖的连线与茎秆延长线的夹角雪的大小,将参试的12个品种划分为直立穗型、半弯曲穗型、弯曲穗型3种类型,研究了不同穗型的群体形态生理性状与产量形成的关系。结果表明,弯曲穗型品种抽穗期干物重较高,直立穗型品种抽穗后和成熟期干物重较高,抽穗后干物重占成熟期干物重的百分比也较高,半弯曲穗型上述方面介于二者之间。直立穗型、半弯曲穗型和弯曲穗型的颖花/叶值相近,说明三者单位叶面积所负担的颖花数差异不大。就粒重/叶而言,直立穗型>半弯曲穗型>弯曲穗型。直立穗和半弯曲穗型品种抽穗后单个颖花拥有的干物质越多,成粒率越高。比叶重大的品种,抽穗后群体叶面积衰减缓慢,具有一定的群体叶面积,对干物质生产和产量的形成是十分有利的。

Relationship between Grain Yield and Physiological Characters of Different Rice Plant Population

According to the angle of panicle-neck, 12 rice varieties in the experiment could be divided into three types: erect, se-mi-cured and cured panicles. The studies on the relationship between grain yield and physiological characters of rice population were conducted. The results showed that the biomass of varieties with cured panicles was higher than that of varieties with erect and se-mi-cured panicles at heading stage. The dry matter accumulated after heading and the biomass at mature stage of varieties with erect panicles were higher than that of varieties with cured panicles. The spikelets-leaf area ratios of rice plants with different types of panicles were nearly the same. But the grain weight-leaf area ratios of rice plants were different. The more the weight of dry matter per spikelet had, the higher the percentage of ripened grains was. It was important that the plant population had large specific leaf weight and leaf area for the grain yield and dry matter production.