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Authors: Denancé, Nicolas and Szurek, Boris and Doyle, Erin L and Lauber, Emmanuelle and Fontaine-Bodin, Lisa and Carrère, Sébastien and Guy, Endrick and Hajri, Ahmed and Cerutti, Aude and Boureau, Tristan and Poussier, Stéphane and Arlat, Matthieu and Bogdanove, Adam J and Noël, Laurent D

Xanthomonas transcription activator-like effectors (TALEs) are injected inside plant cells to promote host susceptibility by enhancing transcription of host susceptibility genes. TALE-encoding (tal) genes were thought to be absent from Brassicaceae-infecting Xanthomonas campestris (Xc) genomes based on four reference genomic sequences. We discovered tal genes in 26 of 49 Xc strains isolated worldwide and used a combination of single molecule real time (SMRT) and tal amplicon sequencing to yield a near-complete description of the TALEs found in Xc (Xc TALome). The 53 sequenced tal genes encode 21 distinct DNA binding domains that sort into seven major DNA binding specificities. In silico analysis of the Brassica rapa promoterome identified a repertoire of predicted TALE targets, five of which were experimentally validated using quantitative reverse transcription polymerase chain reaction. The Xc TALome shows multiple signs of DNA rearrangements that probably drove its evolution from two ancestral tal genes. We discovered that Tal12a and Tal15a of Xcc strain Xca5 contribute together in the development of disease symptoms on susceptible B. oleracea var. botrytis cv Clovis. This large and polymorphic repertoire of TALEs opens novel perspectives for elucidating TALE-mediated susceptibility of Brassicaceae to black rot disease and for understanding the molecular processes underlying TALE evolution.© 2018 The Authors New Phytologist © 2018 New Phytologist Trust.

Journal: The New phytologist
DOI: 10.1111/nph.15148
Year: 2018

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