湖南甘薯种质资源曲叶病毒检测分析初报

本研究依托"第三次全国农作物种质资源普查与收集行动",利用巢式PCR(Nested PCR)检测技术,对从湖南各地区采集的甘薯种质资源进行甘薯曲叶病毒的调查、检测、统计与分析,获得该地区甘薯种质资源曲叶病毒的感染和分布情况。对收集的246份甘薯种质资源进行了甘薯曲叶病毒病症状的调查,记录了每份种质资源的田间生长特性;建立了一种甘薯曲叶病毒巢式PCR检测技术,该技术相对其他技术具有特异性强、灵敏度高、检测通量大、检测成本低的特点。利用建立的巢式PCR检测技术对选取的样品进行甘薯曲叶病毒检测,分析检测结果发现:(1)巢氏PCR共检测出14份甘薯种质资源感染甘薯曲叶病毒,根据病毒基因测序结果分析湖南省至少存在2种曲叶病毒株系。(2)田间调查共发现8份甘薯种质资源的叶片具有甘薯曲叶病毒病典型的卷曲症状,但是其中仅有4份资源与曲叶病毒巢氏PCR检测结果一致;另外4份资源虽然具有明显的卷叶现象但是未检测出曲叶病毒。(3)曲叶病毒检测呈阳性的14份甘薯种质资源分别来源于邵阳市、长沙市、永州市和株洲市4个地区,占种质资源总数的5.7%;4个地区甘薯种质资源的病毒感染率分别为17.6%、14.5%、7.1%和6.7%;全省范围内的种质资源染病情况具有较大的地域差异性;综合甘薯种植情况和地理环境分析,商品薯的跨区域流通和农民自留种的种植习惯是影响甘薯病毒传播的主要因素。本研究首次利用巢式PCR技术对湖南地区甘薯曲叶病毒进行检测和调查,为甘薯种质资源的保存、繁殖、鉴定与利用提供了重要的技术支撑,也为湖南地区甘薯曲叶病毒侵染情况及相关的分子生物学研究提供了数据参考。

Detection and Infection Analysis of Sweet Potato Leaf Curl Virus of Sweet Potato Germplasm Resources in Hunan Province

Based on the third national census of crop germplasm resources and collecting action, 246 sweet potato germplasm resources were collected from 14 regions in Hunan Province, and a set of rapid and effective nested PCR detection method for sweet potato leaf curl virus (SPLCV) was established to investigate the situation of infection and distribution of SPLCV in Hunan province through the rate of virus infection. The results showed that the infection rate of SPLCV was 8.1% in Hunan, and there are fourteen sweet potato resources contained sweet potato leaf curl virus in the four regions of Shaoyang, Changsha, Yongzhou and Zhuzhou, and the infection rate of SPLCV was17.6%, 14.5%, 7.1% and 6.7% respectively, which had great regional differences. This study was the first time to detect and investigate SPLCV in Hunan province, which provided data reference for the situation of infection and distribution of SPLCV in Hunan province. It also provided important technical support for the preservation, reproduction and subsequent development and utilization of sweet potato resources.