Bruggeman Q, Raynaud C, Benhamed M, Delarue M ( 2015) To die or not to die? Lessons from lesion mimic mutants.
Mol Plant Microbe Interact 22: 269– 281 Crossref CAS PubMed Web of Science® Google Scholar Bos JI, Chaparro-Garcia A, Quesada-Ocampo LM, McSpadden Gardener BB, Kamoun S ( 2009) Distinct amino acids of the Phytophthora infestans effector AVR3a condition activation of R3a hypersensitivity and suppression of cell death.Development 136: 3279– 3288 Crossref CAS PubMed Web of Science® Google Scholar Boisson-Dernier A, Roy S, Kritsas K, Grobei MA, Jaciubek M, Schroeder JI, Grossniklaus U ( 2009) Disruption of the pollen-expressed FERONIA homologs ANXUR1 and ANXUR2 triggers pollen tube discharge.Plant Physiol 166: 235– 251 Crossref CAS PubMed Web of Science® Google Scholar Ashfield T, Redditt T, Russell A, Kessens R, Rodibaugh N, Galloway L, Kang Q, Podicheti R, Innes RW ( 2014) Evolutionary relationship of disease resistance genes in soybean and Arabidopsis specific for the Pseudomonas syringae effectors AvrB and AvrRpm1.Genetics 141: 1597– 1604 Crossref CAS PubMed Web of Science® Google Scholar Ashfield T, Keen NT, Buzzell RI, Innes RW ( 1995) Soybean resistance genes specific for different Pseudomonas syringae avirulence genes are allelic, or closely linked, at the RPG1 locus.Our study identifies an important component in PTI regulation and reveals that GmLMM1 acts as a molecular switch to control an appropriate immune activation, which may also be adapted to other PRR-mediated immune signaling in soybean. We further show that GmLMM1 interacts with the flg22 receptor FLS2 and its co-receptor BAK1 to negatively regulate flg22-induced complex formation between them. Overexpression of GmLMM1 gene in Nicotiana benthamiana severely suppresses flg22-triggered ROS production and oomycete pattern XEG1-induced cell death. The mutants exhibit enhanced resistance to both bacterial and oomycete pathogens, as well as elevated ROS production upon treatment with the bacterial pattern flg22. In this study, we perform a forward genetic screen for autoimmunity-related lesion mimic mutants ( lmms) in soybean and identify two allelic mutants, which carry mutations in Glyma.13G054400, encoding a malectin-like receptor kinase (RK). Details of the PTI signaling network are starting to be uncovered in Arabidopsis, but are still poorly understood in other species, including soybean ( Glycine max). Plant cells can sense conserved molecular patterns through pattern recognition receptors (PRRs) and initiate pattern-triggered immunity (PTI).
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