Abstract
Receptor-like kinases (RLKs) in plants are a large superfamily of proteins that are structurally similar. RLKs are involved in a diverse array of plant responses including development, growth, hormone perception and the response to pathogens. Current studies have focused attention on plant receptor-like kinases as an important class of sentinels acting in plant defense responses. RLKs have been identified that act in both broad-spectrum, elicitor-initiated defense responses and as dominant resistance (R) genes in race-specific pathogen defense. Most defense-related RLKs are of the leucine-rich repeat (LRR) subclass although new data are highlighting other classes of RLKs as important players in defense responses. As our understanding of RLK structure, activation and signaling has expanded, the role of the ubiquitin/proteasome system in the regulation of these receptors has emerged as a central theme.
Highlights
Receptor-like kinases (RLKs) consist of a large superfamily of proteins in plants that are structurally similar
The recent identification in rice of a lysine-motif (LysM) receptor kinase involved in the recognition of the fungal elicitor chitin (Kaku et al 2006) and a lectin receptor kinase (LecRK) involved disease resistance indicates that other RLK classes may play important or overlapping roles in plant defense and pathogen recognition
It is clear that RLKs play an important role in both types of defense responses though only a few RLKs involved in defense have been described
Summary
Receptor-like kinases (RLKs) consist of a large superfamily of proteins in plants that are structurally similar. Recent work has highlighted the fact that both elicitor perception in the plant innate immune response and R-gene mediated pathogen specific responses are mediated in many cases by plant RLKs. Most of the RLKs identified as being involved in plant defense are of the LRR-RLK class including the rice Xa21 protein and the Arabidopsis FLS2 and EFR receptors.
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