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Understanding the composition of microbials on the grape carposphere may provide direct guidance for the wine brewing. In this work, 16S rRNA and ITS (Internal Transcribed Spacer) fungal amplicon sequencing were performed to investigate the differences of epiphytic microbial communities inhabiting different varieties of wine grape berries. The results showed that the dominated phylum of different wine grape carpospheres were Proteobacteria, Actinomycetes , Firmicutes , Gemmatimonadete, and Bacteroidetes . The dominant bacterial genera of different wine grape varieties were Pseudomonas, Arthrobacter , Bacillus , Pantoea , Planomicrobium , Massilia , Curtobacterium , Corynebacterium , Cellulomonas , Sphingomonas  , and Microvirga . The fungal communities of the grapes were dominated by Ascomycota for all nine wine varieties . The dominant fungal genera on grape carposphere were Alternaria , Cladosporium , unclassified Capnodiales  ,  Phoma  ,  Rhodotorula , Cryptococcus,  Aureobasidium  , and Epicoccum . Community structure exerts a significant impact on bacterial Bray-Curtis dissimilarity on six red grapes and also a significant bacterial impact on three white grapes. Community structure exerts a significant impact on fungal Bray-Curtis dissimilarity on six red grapes but weak or no fungal impact on three white grapes. The results revealed that grape variety plays a significant role in shaping bacterial and fungal community, varieties can be distinguished based on the abundance of several key bacterial and fungal taxa.

Microbial Community Analyses Associated with Nine Varieties of Wine Grape Carposphere Based on High-Throughput Sequencing