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Induction of Hypersensitive Response and nonhost resistance by a Cladosporium fulvum Elicitor CfHNNI1 is Dose-Dependent and Negatively Regulated by Salicylic Acid

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Journal of Integrative Agriculture 2012年第10期11卷 1665-1674页

作者： XU You-ping CHEN Hui-ying ZHOU Xin CAI Xin-zhong Institute of Biotechnology College of Agriculture and Biotechnology Zhejiang University Center of Analysis and Measurement Zhejiang University Key Laboratory of Molecular Biology of Crop Pathogens and Insects Ministry of Agriculture/Zhejiang University

nonhost resistance is a phenomenon that enables plants to protect themselves against the majority of potential pathogens, and thus has a great potential for application in plant protection. We recently found that CfHNNI1 （for Cladosporium fulvum host and nonhost plant necrosis inducer 1） is an inducer of plant hypersensitive response （HR） and nonhost resistance. In this study, its functional mechanism was analyzed. CfHNN11 was a single copy gene in C. fulvum genome. The functional ORF of the CfHNN11 cDNA was ATG3-TAG780, which showed homology with genes encoding bZIP transcription factors. The functional ORF included in frame an inner one ATG273-TAG780, which was sufficient to induce HR in plants. CfIINN11 induced plant HR in a dose-dependent manner. CfHNNIl-induced necrosis in NahG transgenic tomato plants was significantly stronger than that in their wild type controls. However, the necrosis in Nr and defl tomato mutants was similar to that in their corresponding wild type plants. These data demonstrate that induction of HR and nonhost resistance by CfHNNI1 is negatively regulated by salicylic acid signalling pathway but independent of ethylene and jasmonic acid signalling pathways.

关键词： CfHNNI1 Cladosporium fulvum ethylene hypersensitive response jasmonic acid nonhost resistance salicylic acid

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Induction of Hypersensitive Response and nonhost resistance by a Cladosporium fulvum elicitor CfHNNI1 is Dose-dependent and Negatively Regulated by Salicylic Acid

Induction of Hypersensitive Response and Nonhost Resistance ...

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中国植物病理学会2012年学术年会

作者： XU You-Ping~(1.2) CHEN Hui-Ying~1 LU Lin-Hui~1 ZHOU Xin~1 CAI Xin-Zhong~(1**) (1.Institute of Biotechnology,College of Agriculture and Biotechnology, Zhejiang University,Hangzhou 310058,.China 2.Center of Analysis and measurement,Zhejiang University,Hangzhou 310058,.China)

＜正＞nonhost resistance is a phenomenon that enables plants to protect themselves against the majority of potential pathogens,and thus has a great potential for application in plant *** recently found that CfHNNI1（for Cladosporium fulvum host and nonhost plant necrosis inducer 1 ） is an inducer of plant hypersensitive response（HR） and nonhost *** this study,its functional mechanism was ***1 was a single copy gene in *** *** functional ORF of the CfHNNI1 cDNA was ATG3～TAG780,which shown homology with genes encoding bZIP transcription factors. The functional ORF included in frame an inner one ATG273～TAG780,which was sufficient to induce HR in ***1 induced plant HR in a dose-dependent ***1-induced necrosis in NahG transgenic tomato plants was significantly stronger than in their wild type ***,that in Nr and defl tomato mutants was similar to that in their corresponding wild type *** data demonstrate that induction of HR and nonhost resistance by CfHNNI1 is negatively regulated by salicylic acid signalling pathway but independent of ethylene and jasmonic acid signalling pathways.

关键词： CfHNNI1 Cladosporium fulvum ethylene hypersensitive response jasmonic acid nonhost resistance salicylic acid

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Mutation of a Gene in the Fungus Leptosphaeria maculans Allows Increased Frequency of Penetration of Stomatal Apertures of Arabidopsis thaliana

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Molecular Plant 2008年第3期1卷 471-481页

作者： Candace E. Elliott Harjono Barbara J. Howletta School of Botany The University of Melbourne Melbourne Vic 3010 Australia . Current address: Laboratory of Forest Protection Faculty of Forestry Gadjah Mada University Yogyakarta Indonesia 55281

Leptosphaeria maculans, a pathogen of Brassica napus, is unable to invade most wild-type accessions of Arabidopsis thaliana, although several mutants are susceptible. The infection pathway of L. maculans via a non-invasive inoculation method on A. thaliana Imsl （undefined）, pmr4-1 （defective in callose deposition）, and pen1-1 and pen2-1 （defective in non-host responses to several pathogens） mutants is described. On wild types Col-0 and Ler-0, hyphae are generally arrested at stomatal apertures. A T-DNA insertional mutant of L. maculans （A22） that penetrates stomatal apertures of Col-0 and Ler-0 five to seven times more often than the wild-type isolate is described. The higher penetration frequency of isolate A22 is associated with an increased hypersensitive response, which includes callose deposition. Com- plementation analysis showed that the phenotype of this isolate is due to T-DNA insertion in an intronless gene denoted as ipa （increased penetration on A rabidopsis）. This gene is predicted to encode a protein of 702 amino acids with best matches to hypothetical proteins in other filamentous ascomycetes. The ipa gene is expressed in the wild-type isolate at low levels in culture and during infection of A. thaliana and B. napus.

关键词： nonhost resistance BRASSICA-NAPUS SECONDARY STRUCTURE DISEASE resistance SALICYLIC-ACID OILSEED RAPE

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