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首页> 外文期刊>Mycologia >Colletotrichum gloeosporioides s.l. associated with Theobroma cacao and other plants in Panama: multilocus phylogenies distinguish host-associated pathogens from asymptomatic endophytes
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Colletotrichum gloeosporioides s.l. associated with Theobroma cacao and other plants in Panama: multilocus phylogenies distinguish host-associated pathogens from asymptomatic endophytes

机译：炭疽菌巴拿马可可和其他植物相关的研究：多基因组系统发育将宿主相关病原体与无症状内生菌区分开

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Colletotrichum interacts with numerous plant species overtly as symptomatic pathogens and cryptically as asymptomatic endophytes. It is not known whether these contrasting ecological modes are optional strategies expressed by individual Colletotrichum species or whether a species' ecology is explicitly pathogenic or endophytic. We explored this question by inferring relationships among 77 C. gloeosporioides s.l. strains isolated from asymptomatic leaves and from anthracnose lesions on leaves and fruits of Theobroma cacao (cacao) and other plants from Panama. ITS and 5'-tef1 were used to assess diversity and to delineate operational taxonomic units for multilocus phylogenetic analysis. The ITS and 5'-tef1 screens concordantly resolved four strongly supported lineages, clades A-D: Clade A includes the ex type of C. gloeosporioides, clade B includes the ex type ITS sequence of C. boninense, and clacks C and D are unidentified. The ITS yielded limited resolution and support within all clades, in particular the C. gloeosporioides clade (A), the focal lineage dealt with in this study. In contrast the 5'-tef1 screen differentiated nine distinctive haplotype subgroups within the C. gloeosporioides clade that were concordant with phylogenetic terminals resolved in a five-locus nuclear phylogeny. Among these were two phylogenetic species associated with symptomatic infections specific to either cacao or mango and five phylogenetic species isolated principally as asymptomatic infections from cacao and other plant hosts. We formally describe two new species, C. tropicale and C. ignotum, that are frequent asymptomatic associates of cacao and other Neotropical plant species, and epitypify C. theobromicola, which is associated with foliar and fruit anthracnose lesions of cacao. Asymptomatic Colletotrichum strains isolated from cacao plants grown in China included six distinct C. gloeosporioides clade taxa, only one of which is known to occur in the Neotropics.
机译：炭疽菌作为症状性病原体与许多植物显性地相互作用，而无症状的内生菌则隐秘地相互作用。尚不清楚这些相反的生态模式是否是单个炭疽菌物种表达的可选策略，还是物种的生态系统是明确致病的还是内生的。我们通过推断77个C. gloeosporioides s.l之间的关系来探索这个问题。从无症状叶子和可可可可和其他巴拿马植物的叶子和果实中炭疽病病原中分离出的菌株。 ITS和5'-tef1用于评估多样性并描述可用于多基因座系统发育分析的分类单元。 ITS和5'-tef1筛选一致地解析了四个有力支持的谱系，进化枝A-D：进化枝A包括角孢梭菌的ex类型，进化枝B包括boninense梭菌的ITS类型序列，而进化枝C和D尚未鉴定。 ITS在所有进化枝中，特别是在C. gloeosporioides进化枝（A）中均获得有限的分辨率和支持，这是本研究涉及的重点谱系。相比之下，5'-tef1筛选区分了C. gloeosporioides进化枝中的九个独特的单倍型亚组，这些亚型与五位核系统发育中解析的系统发育末端相一致。其中有两个与可可或芒果特有的有症状感染有关的系统发育种，以及从可可和其他植物宿主中主要作为无症状感染分离出的五个系统发生种。我们正式描述了两个新种，C。Tropicale和C. ignotum，它们是可可和其他新热带植物物种的无症状常伴，并且附生了C. theobromicola，与可可的叶和果实炭疽病病害有关。从中国可可植物中分离出来的无症状炭疽菌菌株包括六种不同的C. gloeosporioides进化枝分类群，其中只有一种发生在新热带地区。

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