80份棉花种质资源的育种应用价值评价

80 Cotton Germplasm Resources: Utilization Value Evaluation

旨在客观、准确评价引种棉花种质资源的应用价值,为棉花新品种培育提供优异亲本,本研究以80份新引进种质资源为材料,以产量、纤维品质、抗病性3方面的10个性状为指标,进行主成分分析和系统聚类分析。结果表明:前4个主成分特征值均大于1,累积贡献率达到76.893%,第1主成分主要与纤维品质有关,第2主成分主要与棉花产量有关,第3主成分主要与抗病性有关,第4主成分主要与纤维伸长率有关。卡方距离为2.15时,供试材料可分为6类,第Ⅰ、第Ⅱ类群综合性状优良,与主成分分析散点图的第Ⅰ类群特点相同,均属于相对高产、优质类群。最终,将聚类分析的第Ⅰ、第Ⅱ类群和主成分分析散点图的第I类群取交集,获得25份高产、优质资源材料,扩充了河北省农林科学院棉花研究所的育种资源圃。

To objectively and accurately evaluate the utilization value of introduced cotton germplasm resources and provide excellent parents for new cotton varieties breeding,a total of 80 cotton germplasm resources were used in this study.Principal component analysis (PCA) and systematic cluster analysis were carried out based on 10 representative traits relating with yield,fiber quality and disease resistance.The results show that the values of the first four principal component features are all greater than 1,and the cumulative contribution rate reaches 76.893%.The first principal component is corresponding with fiber quality,the second principal component is corresponding with cotton yield,the third principal component is corresponding with disease resistance,and the fourth principal component is corresponding with fiber elongation.The 80germplasm resources are divided into 6 major groups at the chi-square distance D=2.15.The comprehensive characters of group Ⅰ and group Ⅱ are excellent,which are the same as those of group Ⅰ in PCA scatter diagram,and they belong to high yield and good quality groups.Finally,25 high-yield and high-quality resource materials are obtained by aggregating the same results of systematic cluster analysis group Ⅰ,group Ⅱ and PCA scatter diagram group I,which can expand breeding resources of the Institute of Cotton of Hebei Academy of Agriculture and Forestry Sciences.