Seven New Colletotrichum Species Gleaned from Various Host Plants in Japan

Colletotrichum species are significant plant-pathogenic fungi that affect a wide range of host plants. In this study, a taxonomical investigation of Colletotrichum species isolated from symptomatic plant leaves collected in Japan was conducted using the polyphasic approach combining morphology and phylogeny. Twenty-two isolates were obtained from herbs, ornamentals, vegetables, and fruit trees. Based on multi-locus phylogenetic analyses and morphological characteristics, the examined isolates were identified as 16 species belonging to six species complexes: C. acutatumspecies complex (CASC, n = 5), C. boninense species complex (CBSC, n = 2), C. dematium species complex (CDSC, n = 1), C. dracaenophilum species complex (CDraSC, n = 1), C. gloeosporioides species complex (CGSC, n = 5), and C. destructivum species complex (CVSC, n = 1). Notably, seven of the identified species were recognized as new to science. These results emphasize the importance of continued studies on the fungal biodiversity of Colletotrichum species in Japan.炭疽菌属（Colletotrichum）真菌是一类重要的植物病原真菌，可侵染多种寄主植物。本研究采用结合形态学与系统发育学的多相分类法，对采自日本的发病植物叶片上分离得到的炭疽菌属菌株开展了分类学研究。本次研究共从草本植物、观赏植物、蔬菜及果树中分离获得22株菌株。基于多位点系统发育分析与形态学特征，供试菌株被鉴定为隶属于6个复合群的16个炭疽菌属物种：尖孢炭疽复合群（C. acutatum species complex, CASC，n=5）、波温炭疽复合群（C. boninense species complex, CBSC，n=2）、变黑炭疽复合群（C. dematium species complex, CDSC，n=1）、龙血树生炭疽复合群（C. dracaenophilum species complex, CDraSC，n=1）、胶孢炭疽复合群（C. gloeosporioides species complex, CGSC，n=5）以及毁灭炭疽复合群（C. destructivum species complex, CVSC，n=1）。值得注意的是，其中7个物种为科学上首次报道的新物种。本研究结果凸显了持续开展日本地区炭疽菌属真菌物种多样性研究的重要性。