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LYS 12 LysM receptor decelerates Phytophthora palmivora disease progression in Lotus japonicus
Author(s) -
Fuechtbauer Winnie,
Yunusov Temur,
Bozsóki Zoltán,
Gavrin Aleksandr,
James Euan K.,
Stougaard Jens,
Schornack Sebastian,
Radutoiu Simona
Publication year - 2018
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.13785
Subject(s) - phytophthora palmivora , oomycete , biology , microbiology and biotechnology , pathogen , lotus , gene , phytophthora , botany , biochemistry
Summary Phytophthora palmivora is a devastating oomycete plant pathogen. We found that P. palmivora induces disease in Lotus japonicus and used this interaction to identify cellular and molecular events in response to this oomycete, which has a broad host range. Transcript quantification revealed that Lys12 was highly and rapidly induced during P. palmivora infection. Mutants of Lys12 displayed accelerated disease progression, earlier plant death and a lower level of defence gene expression than the wild type, while the defence program after chitin, laminarin, oligogalacturonide or flg22 treatment and the root symbioses with nitrogen‐fixing rhizobia and arbuscular mycorrhiza were similar to the wild type. On the microbial side, we found that P. palmivora encodes an active chitin synthase‐like protein, and mycelial growth is impaired after treatment with a chitin‐synthase inhibitor. However, wheat germ agglutinin‐detectable N ‐acetyl‐glucosamine (Glc NA c) epitopes were not identified when the oomycete was grown in vitro or while infecting the roots. This indicates that conventional Glc NA c‐mers are unlikely to be produced and/or accumulate in P. palmivora cell walls and that LYS 12 might perceive an unknown carbohydrate. The impact of Lys12 on progression of root rot disease, together with the finding that similar genes are present in other P. palmivora hosts, suggests that LYS 12 might mediate a common early response to this pathogen.

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