水稻结实率和若干生理因素的品种间差异及其相关研究

Differences and Correlation Between Seed-Setting Rate and Some Physiological Traits in Rice

在云南水稻高产环境下种植6个籼稻品种（IR6559、IR59682、IR65467、IR72、汕优63、桂朝2号），在没有破坏水稻自身的源库关系的情况下，分析了开花期、成熟期及开花至成熟期的部分生理因素对结实率的影响。结果表明，开花期总颖花数、粒叶比、物粒比、比叶重、颖花茎鞘量是影响结实率的主要因素。开花至成熟期间，运转量是影响结实率的唯一因素。成熟期结实率对产量、收获指数的影响较大，而成熟期结实率本身又受到物粒比的制约。

Field experiments were conducted at Taoyuan township, Yunnan Province, China in 1995 and 1996.Some high yielding rice cultivars (IR65598, IR59682, IR65467, IR72, Shanyou 63, Guichao2 ) were grown underoptimum crop management to achieve maximum yield. The seed-setting rate was increased with the increase ofbiomass-spikelet ratio and decreased with the increase of spikelet-leaf ratio, total spikelet number and specific leafweight at flowering stage. During flowering to maturity seed-setting rate was raised by the increase of matter oftransport. At maturity stage yield and harvest index were improved by raised seed-setting rate, and biomassspikelet ratio.