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Identification of an avirulence gene,avrxa5,from the rice pathogen Xanthomonas oryzae ***

Science China(Life Sciences) 2010年第12期53卷 1440-1449页

作者： ZOU HuaSong ZHAO WenXiang ZHANG XiFu HAN YangChun ZOU LiFang CHEN GongYou School of Agriculture and Biology Shanghai Jiaotong UniversityShanghai 200240China College of Plant Protection Nanjing Agricultural University/Laboratory for Monitoring and Management for Plant Pests and DiseasesChinese Ministry of AgricultureNanjing 210095China Department of Agronomy Henan Vocation-Technical Teachers CollegeXinxiang 453003China

Xanthomonas oryzae ***,the causal agent of bacterial blight in rice,interacts with rice plants in a gene-for-gene *** specificity of the interaction is dictated by avirulence(avr) genes in the pathogen and resistance(R) genes in the *** date,no avr genes that correspond to recessive R genes have been *** isolated an avrBs3/pthA family gene,avrxa5,from our previously isolated clone p58,which was originally from strain *** avrxa5 gene converted the PXO99A strain from compatible to incompatible in rice cultivars containing the recessive xa5 gene,but not in those containing the dominant Xa5 *** indicated that avrxa5,which is highly similar to members of the avrBs3/pthA family,encodes a protein of 1238 amino acid residues with a conserved carboxy-terminal region containing three nuclear localization signals and a transcription activation *** has 19.5 34-amino-acid direct repeats,but the 13th amino acid is missing in the fifth and ninth repetitive *** swapping of the repetitive regions between avrxa5 and avrXa7 changed the avirulence specificity of the genes in xa5 and Xa7 rice lines,*** indicates that avrxa5 is distinct from previously characterized avrBs3/pthA *** specificity of avrxa5 toward recessive xa5 in rice could help us better understand the molecular mechanisms of plant-pathogen specific interactions.

关键词： rice bacterial blight Xanthomonas oryzae pv.oryzae avrxa5 avirulence recessive resistance

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Induction of avirulence by AVR-Pita1 in virulent U.S. field isolates of Magnaporthe oryzae’

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The Crop Journal 2014年第1期2卷 1-9页

作者： Yuntao Dai Eugenia Winston James C.Correll Yulin Jia Department of Plant Pathology University of Arkansas USDA Agricultural Research Service Dale Bumpers National Rice Research Center USDA Agriculture Research Service Jamie Whitten Delta States Research Center

The AVR-Pita1 gene,from the Chinese isolate O-137 of Magnaporthe oryzae,is an effector that determines the efficacy of the Pi-ta rice blast resistance *** the present study,the avirulence function of AVR-Pita1 was induced by transformation of field isolates(TM2,ZN19,B2 and B8)that originally were collected from the *** are virulent on Pi-ta-carrying rice *** presence of AVR-Pita1 from O-137 in independent transformants was detected by PCR using AVR-Pita1 specific primers and verified by DNA sequencing and Southern blot analysis using the AVR-Pita1 coding region as a *** results of pathogenicity assays showed that the AVR-Pita1-transformed isolates were not able to infect rice cultivars Katy and Drew carrying *** isolates that were transformed with inserts lacking the AVR-Pita1gene remained *** findings demonstrate that AVR-Pita1 can be used to induce novel gene-specific blast resistance in nature.

关键词： avirulence gene AVR-Pita1 Pi-ta Rice blast resistance

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