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在水稻杂交育种和杂种优势利用中,选择不同遗传背景的品种(系)作为亲本,对于扩大变异幅度及增强杂种优势有着重要的意义。通过育种家的长期实践和许多学者的大量研究,目前人们已普遍认为:杂交亲本双方应有较大的遗传差异。因此,研究作物品种间的遗传差异已成为一个重要的课题。Seal(1964)、奥野忠一等(1971)认为,宜采用主成分分析法来研究作物品种间的遗传差异。目前国内一些学者将主成分分析和聚类分析结合起来进行研究,取得了可喜的成绩。但在以往的研究中,通常是用遗传相关系数矩阵
In hybrid rice breeding and heterosis utilization, selecting varieties (lines) with different genetic backgrounds as parents will be of great significance for enlarging the variation range and enhancing the heterosis. Through the long-term practice of breeders and the large number of studies conducted by many scholars, it is generally believed that there should be greater genetic differences between both parents of hybrids. Therefore, the study of genetic differences between crop varieties has become an important issue. Seal (1964), Okuno et al (1971) that the principal component analysis should be used to study the genetic differences between crop varieties. At present, some scholars in China combine principal component analysis and cluster analysis to make research, and have made gratifying achievements. However, in previous studies, genetic correlation coefficient matrix was usually used