杂交小麦产量结构间关系的分组分析

试验选用9个性状差异较大的品种(系)组配成36个杂交组合,用Nair单性状水平分组法将杂交组合分为低产组、中产组、高产组和超高产组4组。按分组结果对不同产量水平下产量结构间的关系进行了相关和通径分析。结果表明,千粒重对产量的影响较为稳定;在中、高产水平下,单位面积穗数对产量的贡献最大,穗粒数最小;在超高产水平下,穗粒数对产量的直接和间接贡献都最大;超高产水平下,千粒重与穗粒数之间是完全可以协调的,通过增加穗粒数来实现高产比增加单位面积穗数意义更大。

Grouping Analysis of Yield Components Relationship in Hybrid Wheat

Nine different wheat varieties with great character differences were selected and thirty-six hybrid combinations were obtained.The 36 hybrid combinations were divided into 4 groups by single characteristic method of Nair grouping,which were low-yield group,mid-yield group,high-yield group and super-high yield group.The correlation and path analysis of the yield components in different groups were carried out.Results indicated that the influence of 1000-grain weight on yields was stable.At high and middle yield level,the contribution of spike number unit area to yield was the biggest,and the contribution of the grain number per spike was the least.At super-high yield level,direct and indirect contributions of grain number per spike were both the biggest.At the super-high yield level,1000-grain weight and grain number per spike could totally be harmonized.And it was more significant to achieve higher yields by increasing grain number per spike than by enhancing spike number per unit area.