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首页> 外文期刊>Mycologia >Relationships among Colletotrichum isolates from fruit-rots assessed using rDNA sequences.
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Relationships among Colletotrichum isolates from fruit-rots assessed using rDNA sequences.

机译：使用rDNA序列评估的果实腐烂的炭疽菌分离株之间的关系。

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Isolates of Colletotrichum associated with fruit rots in New Zealand were used to test the applicability of morphological, cultural and rDNA sequence data to clarify relationships within this genus. Morphological and cultural features were used to recognize 16 distinct groups among the New Zealand fruit-rotting isolates. These included the currently accepted species C. coccodes, C. musae, C. orbiculare and Glomerella miyabeana as well as 3 C. acutatum-like groups and 9 C. gloeosporioides [Glomerella cingulata]-like groups. Analysis of rDNA sequences from the D2 region allowed the isolates to be separated into 4 broad groups (the relationships of C. coccodes remaining unresolved), the various morphological/cultural groups clustering as subgroups among the rDNA sequence groups. The same 4 groups were recognized when rDNA sequences from the New Zealand isolates were compared with those from Colletotrichum isolates from other hosts and other countries. Taxonomic treatment of the molecular and morphological/cultural data is discussed. It is suggested that a trinomial group-species concept may provide the best approach to subgeneric classification within Colletotrichum. The species name (based on rDNA sequence similarity and supporting morphological and cultural features) indicates the broad group within Colletotrichum to which the isolate belongs; the subspecific name provides additional information on host specialization, morphological variation, etc. It is concluded that before the utility of thisconcept can be properly assessed, the evolutionary and genetic relationships between the various morphological and sequence-defined groups need to be better understood. If such a scheme is shown to be practical in a biological sense, then a number of taxonomic and nomenclatural problems will need to be resolved before it could be adopted.
机译：在新西兰，与水果腐烂相关的炭疽菌分离株用于测试形态学，文化和rDNA序列数据的适用性，以阐明该属之间的关系。形态和文化特征被用来识别新西兰腐烂菌中的16个不同的群体。这些包括目前被接受的物种C. coccodes，C。musae，C。orbiculare和Glomerella miyabeana以及3个C. acutatum类群和9个C. gloeosporioides [Glomerella cingulata]类群。对来自D2区域的rDNA序列进行分析后，将分离物分为4个大类（C.coccodes的关系仍未解析），各种形态学/文化组聚集为rDNA序列组中的子组。将来自新西兰分离株的rDNA序列与来自其他寄主和其他国家的炭疽菌分离株的rDNA序列进行比较时，识别出相同的4组。讨论了分子和形态/文化数据的分类处理。建议三元组物种概念可能为炭疽病中的亚属分类提供最佳方法。物种名称（基于rDNA序列相似性以及支持的形态和文化特征）表示该分离物所属的炭疽菌中的广泛基团。亚特异性名称提供了有关宿主专业化，形态变异等的更多信息。结论是，在可以正确评估此概念的用途之前，需要更好地理解各种形态和序列定义的基团之间的进化和遗传关系。如果这种方案在生物学意义上被证明是可行的，那么在采用之前必须解决许多分类学和命名学问题。

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