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The XA 21 binding protein XB 25 is required for maintaining XA 21‐mediated disease resistance
Author(s) -
Jiang Yingnan,
Chen Xiuhua,
Ding Xiaodong,
Wang Yongsheng,
Chen Qiang,
Song WenYuan
Publication year - 2013
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.12076
Subject(s) - chemistry , microbiology and biotechnology , biology
Summary Plant genomes encode a large number of proteins that potentially function as immune receptors in the defense against pathogen invasion. As a well‐characterized receptor kinase consisting of 23 tandem leucine‐rich repeats, a transmembrane domain and a serine/threonine kinase, the rice ( Oryza sativa ) protein XA 21 confers resistance to a broad spectrum of Xanthomonas oryzae pv. oryzae ( Xoo ) races that cause bacterial blight disease. We report here that XA 21 binding protein 25 ( XB 25) belongs to the plant‐specific ankyrin‐repeat ( PANK ) family. XB 25 physically interacts, in vitro , with the transmembrane domain of XA 21 through its N–terminal binding to transmembrane and positively charged domain ( BTMP ) repeats. In addition, XB 25 associates with XA 21 in planta . The downregulation of Xb25 results in reduced levels of XA 21 and compromised XA 21‐mediated disease resistance at the adult stage. Moreover, the accumulation of XB 25 is induced by Xoo infection. Taken together, these results indicate that XB 25 is required for maintaining XA 21‐mediated disease resistance.