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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >NDR1, A LOCUS OF ARABIDOPSIS THALIANA THAT IS REQUIRED FOR DISEASE RESISTANCE TO BOTH A BACTERIAL AND A FUNGAL PATHOGEN
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NDR1, A LOCUS OF ARABIDOPSIS THALIANA THAT IS REQUIRED FOR DISEASE RESISTANCE TO BOTH A BACTERIAL AND A FUNGAL PATHOGEN

机译：NDR1，拟南芥的一种，对细菌和真菌病原菌均具有抗病性

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We have employed Arabidopsis thaliana as a model host plant to genetically dissect the molecular pathways leading to disease resistance, A. thaliana accession Col-O is susceptible to the bacterial pathogen Pseudomonas syringae pv, tomato strain DC3000 but resistant in a race-specific manner to DC3000 carrying any one of the cloned avirulence genes avrB, avrRpm1, avrRpt2, and avrPph3. Fast-neutron-mutagenized Col-O M(2) seed was screened to identify mutants susceptible to DC3000(avrB). Disease assays and analysis of in planta bacterial growth identified one mutant, ndr1-1 (non-race-specific disease resistance), that was susceptible to DC3000 expressing any one of the four avirulence genes tested. Interestingly, a hypersensitive-like response was still induced by several of the strains. The ndr1-1 mutation also rendered the plant susceptible to several avirulent isolates of the fungal pathogen Peronospora parasitica. Genetic analysis of ndr1-1 demonstrated that the mutation segregated as a single recessive locus, located on chromosome III. Characterization of the ndr1-1 mutation suggests that a common step exists in pathways of resistance to two unrelated pathogens. [References: 44]
机译：我们已经使用拟南芥作为模型宿主植物来遗传剖析导致疾病抗性的分子途径，拟南芥登录号Col-O对细菌病原体丁香假单胞菌pv，番茄菌株DC3000敏感，但对种族具有抗性DC3000带有任何克隆的无毒力基因avrB，avrRpm1，avrRpt2和avrPph3。快速中子诱变的Col-O M（2）种子进行了筛选，以确定对DC3000（avrB）敏感的突变体。疾病检测和植物细菌生长分析确定了一个突变体ndr1-1（非种族特异性疾病抗性），该突变体对DC3000敏感，可表达所测试的四种无毒力基因中的任何一种。有趣的是，几种菌株仍诱导出类似超敏反应。 ndr1-1突变还使植物易受真菌病原体Peronospora parasitica的几种无毒分离株的影响。 ndr1-1的遗传分析表明，该突变被分离为位于染色体III上的单个隐性基因座。 ndr1-1突变的特征表明对两种无关病原体的抗性途径中存在一个共同的步骤。 [参考：44]

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