长豇豆资源的遗传距离估测和聚类分析

对３９份长豇豆品种进行了煤霉病抗性鉴定。并对其１４个重要农艺性状进行考查，以综合性状组、丰产性状组和早熟性状组的遗传相关矩为基础矩阵，分别进行主成分转换并计算欧氏遗传距离，用最长距离法进行品种聚类。结果表明，３９份品种中，有７份对煤霉病表现免疫、高抗或抗病。通过主成分分析、测试、确定了具有较优综合性状的品种１１个，丰产性较优或早熟性较优的品种各９个，试验结果还表明，选择不同的性状组分析，遗传距离及

Genetic Distance Estimation and Cluster Analysis of Some Yardlong Bean Resources

The resistance to Cercospora cruenta of 39 yardlong bean varieties ( Vigna unguiculata ssp. sesquipedalis ( L. ) Verd. ) was identified, and 14 main agronomic characters of them were investigated. Principal component transformations and Euelidean distance esti-mations were made respectively from the genetic correlation matrix of all the 14 measured characters (character combination 1), correlation matrix of 8 high yielding related char-acters (character combination 2) and correlation matrix of 8 early maturing related char-acters (character combination 3) . Finally the variety clusters were made by longest dis-tance method. The results showed that 7 of the 39 varieties were immune, high resistant or resistant to C. cruenta. Through the principal component analysis, 11, 9, and 9 varieties were good in comprehensive characters, yield and maturity respectively. The genetic dis-tances and cluster results were different obviously with various character combinations, So it's necessary to select suitable character combination for analysis according to breeding ob-jectives in practice.