@ARTICLE{TreeBASE2Ref30364, author = {Fatemeh Khodadi and Jonathan B Gonzalez and Phillip L Martin and Emily Giroux and Guillaume J Bilodeau and Kari A Peter and Vinson P Doyle and Srdan G Acimovic}, title = {Identification and characterization of Colletotrichum species causing apple bitter rot in New York and description of C. novaboracense sp. nov.}, year = {2020}, keywords = {Phylogenetics, Bitter rot, Apple, Colletotrichum spp., C. chrysophilum, C. noveboracense sp. nov., C. fructicola, C. fioriniae}, doi = {10.1038/s41598-020-66761-9}, url = {}, pmid = {}, journal = {Scientific Reports}, volume = {10}, number = {11043}, pages = {1--19}, abstract = {Apple bitter rot caused by Colletotrichum species is a growing problem worldwide. Colletotrichum spp. are economically important but taxonomically un-resolved. Identification of Colletotrichum spp. is critical due to potential species-level differences in pathogenicity-related characteristics. A 400-isolate collection from NewYork apple orchards were morphologically assorted to two groups, C. acutatum species complex (CASC) and C. gloeosporioides species complex (CGSC). A sub-sample of 44 representative isolates, spanning the geographical distribution and apple varieties, were assigned to species based on multi-locus phylogenetic analyses of nrITS, GAPDH and TUB2 for CASC, and ITS, GAPDH, CAL, ACT, TUB2, APN2, ApMat and GS genes for CGSC. The dominant species was C. fioriniae, followed by C. chrysophilum and a novel species, C. noveboracense, described in this study. This study represents the first report of C. chrysophilum and C. noveboracense as pathogens of apple. We assessed the enzyme activity and fungicide sensitivity for isolates identified in NewYork. All isolates showed amylolytic, cellulolytic and lipolytic, but not proteolytic activity. C. chrysophilum showed the highest cellulase and the lowest lipase activity, while C. noveboracense had the highest amylase activity. Fungicide assays showed that C. fioriniae was sensitive to benzovindiflupyr and thiabendazole, while C. chrysophilum and C. noveboracense were sensitive to fludioxonil, pyraclostrobin and difenoconazole. All species were pathogenic on apple fruit with varying lesion sizes. Our findings of differing pathogenicity- related characteristics among the three species demonstrate the importance of accurate species identification for any downstream investigations of Colletotrichum spp. in major apple growing regions.} }

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