宁夏地区番茄细菌性斑点病病原菌的分离鉴定及其抗病性鉴定方法的筛选  

Isolation and identification of tomato bacterial spot pathogen in Ningxia and screening of identification methods for disease resistance

作　　者：李小红 王晓敏[1,2,3] 邓文霞 王凯彬 郭猛 程国新 LI Xiaohong;WANG Xiaomin;DENG Wenxia;WANG Kaibin;GUO Meng;CHENG Guoxin(School of Agriculture,Ningxia University,Yinchuan 750021,Ningxia,China;Ningxia Modern Facility Horticulture Engineering Technology Research Center,Yinchuan 750021,Ningxia,China;Key Laboratory of Modern Molecular Breeding for Dominant and Special Crops in Ningxia,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏大学农学院,宁夏银川750021 [2]宁夏现代设施园艺工程技术研究中心,宁夏银川750021 [3]宁夏优势特色作物现代分子育种重点实验室,宁夏银川750021

出　　处：《浙江大学学报（农业与生命科学版）》2023年第3期349-357,共9页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：宁夏回族自治区农业特色优势产业育种专项“瓜菜种质资源创新与新品种选育(2020-2024)”(NXNYYZ20200101);宁夏回族自治区重点研发计划重大项目(2019BBF02022)。

摘　　要：为明确引起宁夏地区番茄细菌性斑点病的病原菌,以宁夏中卫市和吴忠市感染细菌性斑点病的番茄病叶为材料,通过常规组织分离法分离菌株,对其形态学、分子生物学、致病性进行鉴定,并采用四因素三水平正交试验设计[L9(34)]筛选室内苗期抗病性鉴定方法。结果表明:菌株1(分离自宁夏中卫市的病原菌)、菌株2(分离自宁夏吴忠市的病原菌)的菌落形态均呈乳白色,全缘,不透明,表面光滑,产生绿色荧光,菌体杆状,革兰氏染色呈阴性;菌株1、菌株2的16S rDNA序列与丁香假单胞菌番茄致病变种KT783475.1的相似度为99.93%;回接后叶片产生褐色病斑,伴有黄色晕圈,与自然发病植株的症状一致。因此,确定引起宁夏地区番茄细菌性斑点病的病原菌是丁香假单胞菌番茄致病变种(Pseudomonas syringae pv. tomato)。在接种苗期为四叶期、菌悬液浓度为1.00×107 CFU/mL、接种方法为茎秆接种法、保湿时间为96 h的条件下,病情指数为72.22%,显著高于其他处理,是番茄细菌性斑点病室内苗期抗病性鉴定的最佳方法。本研究为宁夏地区番茄细菌性斑点病的防治及抗病育种提供了一定的理论依据。In order to identify the pathogens causing tomato bacterial spot disease in Ningxia,tomato leaves infected with bacterial spot disease from Zhongwei and Wuzhong cities of Ningxia were used as the materials,and the strains were isolated using the conventional tissue isolation method,and their morphology,molecular biology and pathogenicity were identified.The four-factor and three-level orthogonal design of experiment[L9(34)]was conducted to screen the indoor resistance identification method at the seedling stage.The results showed that the colony morphologies of strain 1 isolated from Zhongwei City and strain 2 isolated from Wuzhong City were all milky white,full edge,opaque,smooth surface,producing green fluorescence,rod-shaped cells,and Gram staining was negative.The 16S rDNA sequences of both strain 1 and strain 2 were 99.93%similar to that of Pseudomonas syringae pv.tomato pathogenic variant KT783475.1.After reinoculation,brown lesions with yellow halos were presented on the leaves of the tomato,which was consistent with the natural symptoms.So,it was confirmed that the pathogen causing tomato bacterial spot disease in Ningxia was P.syringae pv.tomato.Under the treatment combination of inoculating seedlings at the four-leaf stage,the bacterial suspension concentration of 1.00×10^(7) CFU/mL,with stem inoculation method and 96 h moisture,the disease index was 72.22%,which was significantly higher than that in other treatments,and thus it was considered to be the best indoor resistance identification method at the seedling stage for tomato bacterial spot disease.The above results will provide a theoretical basis for the prevention and control of tomato bacterial spot disease and resistance breeding in Ningxia.

关 键 词：番茄 细菌性斑点病 形态学鉴定 分子生物学鉴定 

分 类 号：S436.412.19[农业科学—农业昆虫与害虫防治]