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Genomic and Transcriptomic Comparisons of the Twig Blight Pathogen, Passalora sequoiae, with Mycosphaerellaceae Foliar and Conifer Pathogens

生物 细枝 枯萎病 病菌 转录组 真菌病原 植物 遗传学 基因 基因表达
作者
John Dobbs,Jorge R. Ibarra Caballero,Jessa P. Ata,Ebrahiem Babiker,Warren E. Copes,Jane E. Stewart
出处
期刊:Phytopathology [American Phytopathological Society]
卷期号:114 (4): 732-742
标识
DOI:10.1094/phyto-08-23-0271-r
摘要

Passalora sequoiae is a foliar pathogen to conifer tree species. In this study, we conducted whole-genome and transcriptome analyses on isolates of P. sequoiae collected from symptomatic Leyland cypress leaves from a Christmas tree farm in Mississippi. The objectives for this research were to elucidate the pathogenicity mechanisms of P. sequoiae by characterizing the genome and transcriptome and possibly identify unique and shared predicted genes in comparison with non-conifer/canker and foliar pathogens in the family Mycosphaerellaceae. P. sequoiae was found to be similar to other foliar Mycosphaerellaceae pathogens and likely represents a hemibiotrophic lifestyle based on comparisons across pathogens. The genome and in planta transcriptome highlighted some unique features of P. sequoiae: the significant presence of chitin synthases and fructose-degrading carbohydrate-degrading enzymes, trans-AT PKS genes, and antibiotic gene clusters that were unique to P. sequoiae compared with the other Mycosphaerellaceae species genomes. Several transcripts that were highly expressed in planta were identified as effectors, yet the functions were not characterized. These targets provide ample resources to continue to characterize pathogen−conifer host interactions in conifer foliar pathogens. Furthermore, this research helps build genomic resources for an important plant pathogen on Leyland cypress that will further our ability to develop novel management practices that could begin with breeding for resistance.

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