The broad bacterial blight resistance of rice line CBB23 is triggered by a novel transcription activator-like (TAL) effector of Xanthomonas oryzae pv. oryzae
文献类型: 外文期刊
第一作者: Wang, Chun-Lian
作者: Wang, Chun-Lian;Qin, Teng-Fei;Zhang, Xiao-Ping;Che, Jin-Ying;Gao, Ying;Zheng, Chong-Ke;Zhao, Kai-Jun;Wang, Chun-Lian;Yu, Hong-Man;Yang, Bing
作者机构:
关键词: Xa23;TAL effector;broad-spectrum resistance;Xoo;avrXa23;rice
期刊名称:MOLECULAR PLANT PATHOLOGY ( 影响因子:5.663; 五年影响因子:5.626 )
ISSN: 1464-6722
年卷期: 2014 年 15 卷 4 期
页码:
收录情况: SCI
摘要: Bacterial blight (BB), caused by Xanthomonas oryzae pv. oryzae (Xoo), is not only a disease devastating rice production worldwide, but also an ideal model system for the study of the interaction between plants and their bacterial pathogens. The rice near-isogenic line (NIL) CBB23, derived from a cross between a wild rice Oryza rufipogon accession (RBB16) and a susceptible indica rice variety (Jingang 30), is highly resistant to all field Xoo strains tested so far. Although the BB resistance of CBB23 has been widely used in rice breeding programmes, the mechanism of its extremely broad-spectrum resistance remains unknown. Here, we report the molecular cloning of an avirulence gene, designated as avrXa23, from Xoo strain PXO99(A). We validate that AvrXa23, a novel transcription activator-like effector, specifically triggers the broad-spectrum BB resistance in CBB23. The prevalence of avrXa23 in all 38 Xoo strains surveyed may explain the broad-spectrum feature of BB resistance in CBB23. The results will significantly facilitate the molecular cloning of the corresponding resistance (R) gene in the host, and provide new insights into our understanding of the molecular mechanism for broad-spectrum disease resistance in plants.
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