黄瓜绿斑驳花叶病毒Cucumber green mottle mosaic virus(CGMMV)是葫芦科作物的重要检疫性病毒。本研究以田间自然感病的西瓜叶片为试材,采用RT-PCR获得该病毒(CGMMV-LNYK)基因组全长(登录号MG745849),以pBluescriptⅡSK(-)为载体,分别...黄瓜绿斑驳花叶病毒Cucumber green mottle mosaic virus(CGMMV)是葫芦科作物的重要检疫性病毒。本研究以田间自然感病的西瓜叶片为试材,采用RT-PCR获得该病毒(CGMMV-LNYK)基因组全长(登录号MG745849),以pBluescriptⅡSK(-)为载体,分别克隆其所编码的4段基因,并采用人工接种验证它们的体外侵染活性。结果表明:该病毒与韩国分离物KW(登录号AF417242)亲缘关系最近,相似度达99.8%,并成功克隆了CGMMV-LNYK编码的4段基因,分别记为RNA1～RNA4。经人工接种,发现RNA1和RNA4能侵染葫芦,表现明显花叶症状,与该病毒接种葫芦症状一致,且接种RNA1后的症状较RNA4明显,4种RNA混合接种症状最为明显,经RT-PCR检测,发病植株可扩增到与接种的RNA大小相等的片段。展开更多
Plants are exposed to many potentially pathogenic microbes in the environment, but each species is only susceptible to a limited number of pathogens. The broad resistance is referred to as nonhost re-sistance. To date...Plants are exposed to many potentially pathogenic microbes in the environment, but each species is only susceptible to a limited number of pathogens. The broad resistance is referred to as nonhost re-sistance. To date, little is known about the underlying mechanism of nonhost resistance and the sig-naling transduction process. Here we describe a simple method for isolating Arabidopsis nonhost re-sistance mutants against a nonadapted bacterial pathogen. A RAP2.6 promoter-driven LUC reporter system was developed to replace the tedious bacterial growth assay during the primary screening. The RAP2.6-LUC reporter gene is normally induced by the virulent bacterium Pseudomonas syringae pv tomato but not the nonadapted bacterium P. syringae pv phaseolicola. By using this method we iso-lated 4 mutants displaying strong reporter activity in response to P. syringae pv phaseolicola, which were characterized in some details. ebs1, ebs2, ebs3, and ebs4 (enhanced bacterial susceptibility) were compromised in resistance against P. syringae pv phaseolicola and/or P. syringae pv tomato. In addi-tion, ebs4 showed enhanced hypersensitive response to the incompatible bacterium P. syringae pv tomato (avrB). These results demonstrated that the method is suited for large scale screening for nonhost resistance mutants.展开更多
文摘黄瓜绿斑驳花叶病毒Cucumber green mottle mosaic virus(CGMMV)是葫芦科作物的重要检疫性病毒。本研究以田间自然感病的西瓜叶片为试材,采用RT-PCR获得该病毒(CGMMV-LNYK)基因组全长(登录号MG745849),以pBluescriptⅡSK(-)为载体,分别克隆其所编码的4段基因,并采用人工接种验证它们的体外侵染活性。结果表明:该病毒与韩国分离物KW(登录号AF417242)亲缘关系最近,相似度达99.8%,并成功克隆了CGMMV-LNYK编码的4段基因,分别记为RNA1～RNA4。经人工接种,发现RNA1和RNA4能侵染葫芦,表现明显花叶症状,与该病毒接种葫芦症状一致,且接种RNA1后的症状较RNA4明显,4种RNA混合接种症状最为明显,经RT-PCR检测,发病植株可扩增到与接种的RNA大小相等的片段。
基金the Shanghai Leading Academic Discipline Project (Grant No. B209)a grant from Chinese Ministry of Science and Technology to Zhou Jian Min (Grant No. 2003AA210080)
文摘Plants are exposed to many potentially pathogenic microbes in the environment, but each species is only susceptible to a limited number of pathogens. The broad resistance is referred to as nonhost re-sistance. To date, little is known about the underlying mechanism of nonhost resistance and the sig-naling transduction process. Here we describe a simple method for isolating Arabidopsis nonhost re-sistance mutants against a nonadapted bacterial pathogen. A RAP2.6 promoter-driven LUC reporter system was developed to replace the tedious bacterial growth assay during the primary screening. The RAP2.6-LUC reporter gene is normally induced by the virulent bacterium Pseudomonas syringae pv tomato but not the nonadapted bacterium P. syringae pv phaseolicola. By using this method we iso-lated 4 mutants displaying strong reporter activity in response to P. syringae pv phaseolicola, which were characterized in some details. ebs1, ebs2, ebs3, and ebs4 (enhanced bacterial susceptibility) were compromised in resistance against P. syringae pv phaseolicola and/or P. syringae pv tomato. In addi-tion, ebs4 showed enhanced hypersensitive response to the incompatible bacterium P. syringae pv tomato (avrB). These results demonstrated that the method is suited for large scale screening for nonhost resistance mutants.
