Groenewald Marizeth, Groenewald Johannes Z, Braun Uwe, Crous Pedro W
Centraalbureau voor Schimmelcultures, Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands.
Mycologia. 2006 Mar-Apr;98(2):275-85. doi: 10.3852/mycologia.98.2.275.
The genus Cercospora is one of the largest and most heterogeneous genera of hyphomycetes. Cercospora species are distributed worldwide and cause Cercospora leaf spot on most of the major plant families. Numerous species described from diverse hosts and locations are morphologically indistinguishable from C. apii and subsequently are referred to as C. apii sensu lato. The importance and ecological role that different hosts play in taxon delimitation and recognition within this complex remains unclear. It has been shown that Cercospora leaf spot on celery and sugar beet are caused respectively by C. apii and C. beticola, both of which are part of the C. apii complex. During this study we characterized a new Cercospora species, C. apiicola, which was isolated from celery in Venezuela, Korea and Greece. The phylogenetic relationship between C. apiicola and other closely related Cercospora species was studied with five different gene areas. These analyses revealed that the C. apiicola isolates cluster together in a well defined clade. Both C. apii and C. beticola sensu stricto form well defined clades and are shown to have wider host ranges and to represent distinct species.
尾孢菌属是丝孢纲中最大且最具多样性的属之一。尾孢菌物种分布于全球，在大多数主要植物科上引起尾孢叶斑病。从不同寄主和地点描述的许多物种在形态上与芹菜尾孢菌无法区分，随后被称为广义的芹菜尾孢菌。不同寄主在这个复合类群的分类界定和识别中所起的重要性和生态作用仍不清楚。研究表明，芹菜和甜菜上的尾孢叶斑病分别由芹菜尾孢菌和甜菜生尾孢菌引起，这两种菌都是芹菜尾孢菌复合类群的一部分。在本研究中，我们鉴定了一种新的尾孢菌物种——委内瑞拉尾孢菌，它是从委内瑞拉、韩国和希腊的芹菜中分离出来的。利用五个不同的基因区域研究了委内瑞拉尾孢菌与其他密切相关的尾孢菌物种之间的系统发育关系。这些分析表明，委内瑞拉尾孢菌分离株聚集在一个明确的分支中。狭义的芹菜尾孢菌和甜菜生尾孢菌都形成了明确的分支，并且显示出更广泛的寄主范围，代表不同的物种。
