山东省不同时期小麦杂交组合选配特点的初步研究

本文以山东省建国以来不同时期推广的优良品种及其亲本为试材,分析了不同时期杂交组合的选配特点。聚类分析的结果表明,几乎所有的杂交育成品种的亲本都是选自不同的类群。近期品种一般是多个性状的改良指数较大,品种综合性状显著改善,综合改良指数 CI 值逐渐提高。杂交亲本间遗传距离 D~2与育成品种的 CI 值呈二次曲线关系,(?)=-3.7801X~2+55.5907X-165.1575。

CHARACTERS OF PARENT-SELECTED MATING IN WHEAT BREEDING IN SHANDONG PROVINCE DURING DIFFERET PERIODS

With elite winter wheat cultivars bred and released in Shandong Province since 1949 and the parents entried in crossing,the characters of parent-selected mating in cross combina- tions during different periods were analysed.Almost all the representative cultivars grown in Shandong Province were created by the crosses whose parents were selected from different groups.Generally speaking,the present cultivars had higher values for many good traits, which resulted in the improvement of comprehensive characters.Therefore,the comprehen- sive index of improvement(CI) got higher as time went on.The result showed that there was a significant parabolical regression relationship between D~2 and CI,(?)=-3.7801X~2 +55.5907X-165.1575.