A brief overview on early events of Xa21 mediated pattern triggered immunity

Abstract

In plant associated pattern-triggered immunity (PTI), pattern-recognition receptors (PRRs) play crucial role in the mechanism of first line of defense against pathogenic invasion. Throughout the event, PRR binds with microorganism’s pathogen-associated molecular pattern (PAMP) and recruit co-receptor protein to initiate the primary defense signal. Although several plant PRRs have been identified, very few of them have been fully characterized and studied so far. PRR Xa21 perceives PAMP RaxX21 and activates pattern triggered immunity in Oryzae spp (rice). The early events regulated by Xa21 is mainly binding of it with PAMP RaxX21 as well as recruit a co-receptor protein OsSerk2. This review article elucidates the steps of activating first line of defense mechanism of rice plant arbitrated by PRR Xa21.