根结线虫数值分类方法的筛选研究

本研究对Melo■属60个OTUS和18项分类性状分别进行Q分类和R分类,结果表明;Q分类以在切比雪夫距离上用中间距离法进行聚类效果最佳,能概括和直观地表达根结线虫的表相关系;R分类在马氏距离上用中间距离法聚类能很好地表达数量性状之间、质量性状之间以及数量性状与质量性状之间的表相关系。Q分类结果还表明,60个OTUS的单位距离(种间)不存在属的差异,应取消H(?)属,原H(?)属中的种均应归属于Mel(?)属,M.(?)(?)并非是M.(?)的亚种,应提升为独立的一个种。

STUDIES ON SELECTION IN NUMERICAL TAXONOMY METHODS OF THE NEMATODE GENUS MELOIDOGYNE WITH HYPSOPERINE(Nematoda:Heteroderoidea)

During the study of the numerical taxonomy,60 OTUs and 18 characters have been studied and analyzed by means of Q-classification and R-classification,respectively,3 methods of numerical taxonomy and 11 operations have been analyzed.The best method for Q-cluster of Meloidogyne is the median cluster based on the distant of Tschebyscheff,by which the phenetical relationships of the species are graphically summerized and directly perceived and for R-cluster is median cluster based of distance of P.C.Mahalanobis,by which the phenetical relationship between the quantitative characters,the qualtative ones and between the quantitative and the qualitative are well expressed.It has a similar result as the one of the stuby on weights.The study results of Q-cluster show that there is no differenciation of genus among 60 OTUs between unit distances (interspecies) ,the genus Hypsoperine should belong to genus Meloidogyne.Next,H.acronea and M.acronea not gathering in a group until D=400,probably should not be the same species but two individuals.In addition,M.incognita wartellei and M.incoginta meet in a group only on D=20,that means they have an rather close relationship.