Akhurst R J, Boemare N E
Division of Entomology, CSIRO, Canberra, Australia.
J Gen Microbiol. 1988 Jul;134(7):1835-45. doi: 10.1099/00221287-134-7-1835.
Data from a study of both phases of 21 strains of Xenorhabdus examined for 240 characters were subjected to numerical analysis. Only 60 characters were used for the analyses, since 169 characters were common to all isolates, and the acidification data essentially duplicated the assimilation tests. The data were arranged in seven ways to determine the significance of characters affected by phase change and of weak responses. Most of the analyses involved calculation of similarities by the Jaccard coefficient and clustering by single linkage, complete linkage and centroid sorting algorithms. The resultant dendrograms emphasized the importance of recognizing phase-related characteristics in examining the taxonomy of Xenorhabdus. They also demonstrated a close correspondence between the taxonomic groupings of Xenorhabdus and those of their nematode associates. It is proposed that the subspecies of X. nematophilus be elevated to species, X. nematophilus, X. bovienii, X. poinarii and X. beddingii.
对21株致病杆菌两个阶段的研究数据进行了240个特征的检测，并进行了数值分析。由于169个特征在所有分离株中都相同，且酸化数据基本上重复了同化试验，因此仅使用60个特征进行分析。数据以七种方式排列，以确定受相变影响的特征和弱反应的重要性。大多数分析涉及通过杰卡德系数计算相似度，并通过单链、完全连锁和质心排序算法进行聚类。所得的树形图强调了在研究致病杆菌分类学时识别与阶段相关特征的重要性。它们还表明致病杆菌与其线虫共生体的分类分组之间存在密切对应关系。建议将嗜线虫致病杆菌的亚种提升为种，即嗜线虫致病杆菌、博维致病杆菌、波氏致病杆菌和贝氏致病杆菌。
