Citrus tristeza virus （CTV） causes economically important losses to the citrus industry worldwide. Mild strain cross protection （MSCP） against tristeza has hardly been practised due to mixed infection of different...Citrus tristeza virus （CTV） causes economically important losses to the citrus industry worldwide. Mild strain cross protection （MSCP） against tristeza has hardly been practised due to mixed infection of different CTV-strains and little background of its molecular biology in China. For better cognition on CTV, 192 sweet orange samples collected from eight provinces （Chongqing, Sichuan, Fujian, Hunan, Guangxi, Yunnan, Guangdong and Jiangxi） were tested by direct tissue blot immuno-assay （DTBIA）, and 158 of them were tested positively, which therefore were subjected to coat protein gene （CPG）/Hinf Ⅰ restriction fragment length polymorphism （RFLP） analysis. Sample bulks were compared between Chongqing and Fujian by some statistical data, including ratios of single infection and mixed infection to local samples, proportions of CTV isolates with single RFLP groups, and rates of each RFLP group. The simplified analysis of samples from the other six provinces were then conducted. This study suggests that CTV isolates with CPG/Hinf Ⅰ RFLP groups Ⅲ and Ⅰ are the main epidemic ones in China, and mixed infection of CTV in fields are popular. Based on observation of severity of stem-pitting symptom in field trees, CTV isolates with CPG/Hinf Ⅰ RFLP groups Ⅲ and Ⅰ caused severe stem-pittings in sweet oranges in China.展开更多
目的建立贝类中GⅠ、GⅡ诺如病毒快速检测与分群方法。方法对比分析6株主要流行的GⅠ、GⅡ诺如病毒及参考诺如病毒的基因序列,筛选保守区域引物,优化建立SYBR Green Ⅰ荧光定量检测与熔解曲线快速分群方法,并对实际样品检测验证。结果引...目的建立贝类中GⅠ、GⅡ诺如病毒快速检测与分群方法。方法对比分析6株主要流行的GⅠ、GⅡ诺如病毒及参考诺如病毒的基因序列,筛选保守区域引物,优化建立SYBR Green Ⅰ荧光定量检测与熔解曲线快速分群方法,并对实际样品检测验证。结果引物P289/290可同时检测GⅠ、GⅡ诺如病毒,SYBR Green Ⅰ荧光定量检测方法在病毒浓度10^3~10^9 copies 之间呈现良好的线性关系( R^2=0.993, P <0.01),熔解曲线Tm值可区分GⅠ和GⅡ不同基因群的诺如病毒( F = 7 507.60 , P <0.05 )。120份贝类样品阳性检出率5.83%,其中阳性结果测序鉴定与快速分群方法结论一致。结论该方法成本低、检测快速、分群准确,具有良好重复性,适用于贝类中GⅠ、GⅡ诺如病毒的快速检测与分群。展开更多
基金supported by the National Natural Science Foundation of China(30471205)under the program"Comparison Research on Strains of Citrus tristeza virus."
文摘Citrus tristeza virus （CTV） causes economically important losses to the citrus industry worldwide. Mild strain cross protection （MSCP） against tristeza has hardly been practised due to mixed infection of different CTV-strains and little background of its molecular biology in China. For better cognition on CTV, 192 sweet orange samples collected from eight provinces （Chongqing, Sichuan, Fujian, Hunan, Guangxi, Yunnan, Guangdong and Jiangxi） were tested by direct tissue blot immuno-assay （DTBIA）, and 158 of them were tested positively, which therefore were subjected to coat protein gene （CPG）/Hinf Ⅰ restriction fragment length polymorphism （RFLP） analysis. Sample bulks were compared between Chongqing and Fujian by some statistical data, including ratios of single infection and mixed infection to local samples, proportions of CTV isolates with single RFLP groups, and rates of each RFLP group. The simplified analysis of samples from the other six provinces were then conducted. This study suggests that CTV isolates with CPG/Hinf Ⅰ RFLP groups Ⅲ and Ⅰ are the main epidemic ones in China, and mixed infection of CTV in fields are popular. Based on observation of severity of stem-pitting symptom in field trees, CTV isolates with CPG/Hinf Ⅰ RFLP groups Ⅲ and Ⅰ caused severe stem-pittings in sweet oranges in China.
文摘为了建立一种快速、特异、灵敏的检测I群禽腺病毒的液相基因芯片方法。根据Hexon基因序列设计特异引物,上游引物5'端加TAG序列,下游引物5'端加生物素,进行PCR扩增,将扩增产物与链霉素亲和蛋白、磁珠37℃孵育30 min,通过Luminex200仪器分析。用所建立的液相基因芯片方法进行特异性、灵敏度、重复性及病料样品的检测。结果该方法的特异性强;检测的敏感性可达1×102copies/μL;批内批间的变异系数都在5%以下;检测结果与SYBR Green I荧光PCR方法 100%相符。表明建立的液相基因芯片方法特异性好、灵敏高、重复性好,可用于I群禽腺病毒的检测。
文摘目的建立贝类中GⅠ、GⅡ诺如病毒快速检测与分群方法。方法对比分析6株主要流行的GⅠ、GⅡ诺如病毒及参考诺如病毒的基因序列,筛选保守区域引物,优化建立SYBR Green Ⅰ荧光定量检测与熔解曲线快速分群方法,并对实际样品检测验证。结果引物P289/290可同时检测GⅠ、GⅡ诺如病毒,SYBR Green Ⅰ荧光定量检测方法在病毒浓度10^3~10^9 copies 之间呈现良好的线性关系( R^2=0.993, P <0.01),熔解曲线Tm值可区分GⅠ和GⅡ不同基因群的诺如病毒( F = 7 507.60 , P <0.05 )。120份贝类样品阳性检出率5.83%,其中阳性结果测序鉴定与快速分群方法结论一致。结论该方法成本低、检测快速、分群准确,具有良好重复性,适用于贝类中GⅠ、GⅡ诺如病毒的快速检测与分群。
