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《中国作物学会50周年庆祝会暨2011年学术年会论文集》2011年
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The receptor kinase XAK1 regulates the early signaling of the pattern-recognition receptor XA21-mediated innate immunity

Mawsheng Chern  Patrick E.  Canlas  Pamela C.Ronald  
【摘要】:正Plants sense potential microbial invaders by using pattern-recognition receptors to recognize pathogen-associated molecular patterns(PAMPs).In rice,the leucine-rich repeat receptor kinase XA21 acts as pattern-recognition receptor for the bacterial PAMP Ax21(Activator of XA21-mediated immunity) and contribute to innate immunity against Xanthomonas oryzae pv.oryzae(Xoo),the causal bacterial pathogen to rice.Little is known about the early signaling in XA21 -mediated innate immune response.Here we show that XAK1(XA21-associated receptor kinase 1),one of rice somatic embryogenesis receptor kinases(SERKs) is essential for XA21-mediated innate immunity.XA21 plants silenced for XAK1 show deeply compromised resistance to Xoo indicating that XAK1 acts as a positive regulator in signaling.We provide evidence that XAK1 interacts with XA21 in yeast in a kinase-dependent manner.The association of XAK1 with XA21 in vivo is legend-independent.In addition,we found that XAK1 is associated with developmental regulation through the plant hormone brassinolide(BL).Thus,XAK1 is not only associated with PRR-dependent signaling,which initiates innate immunity but also regulates development through the hormone BL.

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