|Title||Comparing Arabidopsis receptor kinase and receptor protein-mediated immune signaling reveals BIK1-dependent differences|
|Author(s)||Wan, Wei Lin; Zhang, Lisha; Pruitt, Rory; Zaidem, Maricris; Brugman, Rik; Ma, Xiyu; Krol, Elzbieta; Perraki, Artemis; Kilian, Joachim; Grossmann, Guido; Stahl, Mark; Shan, Libo; Zipfel, Cyril; Kan, Jan A.L. van; Hedrich, Rainer; Weigel, Detlef; Gust, Andrea A.; Nürnberger, Thorsten|
|Source||New Phytologist 221 (2019)4. - ISSN 0028-646X - p. 2080 - 2095.|
Laboratory of Phytopathology
|Publication type||Refereed Article in a scientific journal|
|Keyword(s)||Arabidopsis - immune receptor - immune signaling comparison - plant immunity - receptor kinase - receptor protein|
Pattern recognition receptors (PRRs) sense microbial patterns and activate innate immunity against attempted microbial invasions. The leucine-rich repeat receptor kinases (LRR-RK) FLS2 and EFR, and the LRR receptor protein (LRR-RP) receptors RLP23 and RLP42, respectively, represent prototypical members of these two prominent and closely related PRR families. We conducted a survey of Arabidopsis thaliana immune signaling mediated by these receptors to address the question of commonalities and differences between LRR-RK and LRR-RP signaling. Quantitative differences in timing and amplitude were observed for several early immune responses, with RP-mediated responses typically being slower and more prolonged than those mediated by RKs. Activation of RLP23, but not FLS2, induced the production of camalexin. Transcriptomic analysis revealed that RLP23-regulated genes represent only a fraction of those genes differentially expressed upon FLS2 activation. Several positive and negative regulators of FLS2-signaling play similar roles in RLP23 signaling. Intriguingly, the cytoplasmic receptor kinase BIK1, a positive regulator of RK signaling, acts as a negative regulator of RP-type immune receptors in a manner dependent on BIK1 kinase activity. Our study unveiled unexpected differences in two closely related receptor systems and reports a new negative role of BIK1 in plant immunity.