Whole Genome Resources of 17 Curtobacterium flaccumfaciens Strains Including Pathotypes of C. flaccumfaciens pv. betae , C. flaccumfaciens pv. oortii , and C. flaccumfaciens pv. poinsettiae Article - Avril 2022

Ebrahim Osdaghi, Geraldine G. Taghouti, Cécile Dutrieux, S. Mohsen Taghavi, Amal Fazliarab, Martial Briand, Marion Fischer-Le Saux, Perrine Portier, Marie-Agnès Jacques

Ebrahim Osdaghi, Geraldine G. Taghouti, Cécile Dutrieux, S. Mohsen Taghavi, Amal Fazliarab, Martial Briand, Marion Fischer-Le Saux, Perrine Portier, Marie-Agnès Jacques, « Whole Genome Resources of 17 Curtobacterium flaccumfaciens Strains Including Pathotypes of C. flaccumfaciens pv. betae , C. flaccumfaciens pv. oortii , and C. flaccumfaciens pv. poinsettiae  », Molecular Plant-Microbe Interactions, avril 2022, pp. 352-356. ISSN 0894-0282

Abstract

RNA interference is a mechanism of suppressing gene expression in plants, animals and fungi. This regulation mechanism involves three main enzymes, Dicers (Dcr), Argonautes (Ago) and RNA Dependent RNA Polymerases (Rdrp) allowing to produce smallRNAs. RNA interference and smallRNAs have a role in the plant–microorganisms interaction, either in a pathogenic or in a symbiotic relationships. Alternaria brassicicola is a pathogenic fungus of the Brassicaceae plants. During plant infection, it is able to transmit itself vertically and horizontally, giving advantages for new infection and dissemination. To investigate RNA interference and the presence of smallRNAs in A. brassicicola, an in silico analysis was achieved. Two DCR, 4 AGO and 3 RDRP genes were identified comforting the presence of smallRNAs in A. brassicicola. SmallRNA sequencing from wild-type strain and DCR deleted mutants allowed the identifcation of 17 miRNAs in A. brassicicola. The synthesis of these miRNAs is only weakly influenced by the inactivation of DCR genes suggesting the possible existence of an alternative Dicer-independent miRNA synthesis pathway. Target’s prediction of A. brassicicola miRNAs identified genes in the fungus and in the plant model Arabidopsis thaliana. Some miRNAs were predicted to target A. thaliana genes involved in the methylation of histone and in the disease resistance

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