滇中地区旱地小麦品种产量稳定性探讨

RESEARCH ON THE YIELD STABILITY OF WHEAT VARIETIES ON DRYLAND IN THE CENTRAL REGION OF YUNNAN

用回归系数（b）估测各品种年度间产量的稳定性,用决定系数（r^2）值测b值的可靠性,并通过对年度间产量构成三因子稳定性分析,得出:参试13个品种、品系的稳定性是以其产量构成三因子的合理组合为基础的。采用多元标准回归系数及偏相关系数分析三因子与产量形成的关系及三因子间的关系,得出在生产力水平较低的条件下,应着重在足够穗数的基础上协调穗数与粒数的关系;在生产力水平较高的条件下着重在一定穗数的基础上协调粒数与粒重的关系。滇中地区旱地小麦稳产高产品种的选育,应在多穗基础上,寻求粒重与粒数的平衡,两者不可偏重。

Regression coefficient(b) and positive coefficient(r2) were used to estimate the yield stability of 13 varieties or lines grown in different years and check the reliability of b value respectively. It was showed that the yield stability of varieties and lines appeared in accordance with the rational composition of 3 factors-spike number, kernel number and kernel weight which are involved in yield.Furthermore, the relationship among those 3 factors and interaction of them were also evaluated by means of multi-regression coefficient and partial correlation coefficient, it was appeared the emphasis should be Put on the sufficient spike number and then the adjustment of correlation between spike number and kernel number in the condition of low Productivity, but on the basis of Proper spike number to coordinate the correlation of kernel number and kernel weight in the condition of medium or higher Productivity. The target of breeding for. stable, high yield varieties of dryland wheat in Yunnan's middle Parts seems to be aimed at equilibrium of kernel number and kernel weight basing on the more skikes. Any inclination to either side is not feasible