小麦上三叶性状与产量及其构成因素的关系

为了解小麦上三叶性状与产量构成因素之间的关系，选用15个丰产型小麦品种(系)，采用相关及回归分析方法，分析了小麦上三叶性状与产量构成因素问的相关性。结果表明，上三叶的宽与单株粒重呈显著相关关系，旗叶宽对单株粒重的贡献较大，单株粒重随着旗叶宽度的增加而增加。且幅度较大。进一步回归分析发现，旗叶宽和倒二叶面积对单株粒重的直线回归方程是真实的，旗叶宽度每增加1cm，单株粒重就会增加7．7284g，倒二叶面积每增加1cm^2，单株粒重增加0．4146g。

Relation between Characters of the Top-three Leaves and Yield and Its Compositions of Wheat

Fifteen genotypes of high-yield wheat were studied as materials. This experiment indicated that the flag leaf was an important part in all over the life in wheat. There was a significant relationship between the width of the top three leaves and grain weight per plant, the grain weight per plant increased much greater with the width increasing of flag leaf than with that of other traits, and grain weight per plant increased in wider range. Increasing one cm width of flag leaf, the grain weight per plant could increase 7.7284 g, and the area of the second leaf was less importance to grain weight per plant.