水稻结实率和若干生理因素的品种间差异及其相关研究

 在云南水稻高产环境下种植6个籼稻品种(IR65598、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。

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

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.