Pérez-Quintero A. L. auteur aut IRD Rodriguez R. L. M. auteur aut IRD Cuesta-Morrondo S. auteur aut IRD Hakalová E. auteur aut IRD Betancurt-Anzola D. auteur aut IRD Valera L. C. C. auteur aut IRD Cardenas L. A. C. auteur aut IRD Matiz-Céron L. auteur aut IRD Jacobs J. M. auteur aut IRD Roman-Reyna V. auteur aut IRD Muñoz A. R. auteur aut IRD Giraldo A. J. B. auteur aut IRD Koebnik Ralf auteur aut IRD text journalArticle eng text/pdf born digital access Strains of Xanthomonas citri pv. malvacearum cause bacterial blight of cotton, a potentially serious threat to cotton production worldwide, including in sub-Saharan countries. Development of disease symptoms, such as water soaking, has been linked to the activity of a class of type 3 effectors, called transcription activator-like (TAL) effectors, which induce susceptibility genes in the host's cells. To gain further insight into the global diversity of the pathogen, to elucidate their repertoires of TAL effector genes, and to better understand the evolution of these genes in the cotton-pathogenic xanthomonads, we sequenced the genomes of three African strains of X. citri pv. malvacearum using nanopore technology. We show that the cotton-pathogenic pathovar of X. citri is a monophyletic lineage containing at least three distinct genetic subclades, which appear to be mirrored by their repertoires of TAL effectors. We observed an atypical level of TAL effector gene pseudogenization, which might be related to resistance genes that are deployed to control the disease. Our work thus contributes to a better understanding of the conservation and importance of TAL effectors in the interaction with the host plant, which can inform strategies for improving resistance against bacterial blight in cotton. specialized bacterial blight cotton evolution genome sequencing phylogenomic analysis resistance TAL effector Xanthomonas 076 020 113 1387-1393 2023 0031-949X https://www.documentation.ird.fr/hor/fdi:010090242 10.1094/phyto-12-22-0477-sc 0031-949X [F B010090242] https://www.documentation.ird.fr/hor/fdi:010090242 https://www.documentation.ird.fr/intranet/publi/2023-11/010090242.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2023-11-10 2025-02-24 fdi:010090242 fre