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Relationship Between Ralstonia solanacearum Diversity and Severity of Bacterial Wilt Disease in Tomato Fields in China

文献类型： 外文期刊

作者： Zheng, Xue-fang 1 ; Zhu, Yu-jing 2 ; Liu, Bo 2 ; Zhou, You 2 ; Che, Jian-mei 2 ; Lin, Nai-quan 1 ;

作者机构： 1.Fujian Agr & Forestry Univ, Biol Control Res Inst, Fuzhou 350002, Peoples R China

2.Fujian Acad Agr Sci, Agr Bioresources Res Inst, Fuzhou 350003, Peoples R China

关键词： bacterial wilt disease;China;pathogenic differentiation;Ralstonia solanacearum;tomato

期刊名称：JOURNAL OF PHYTOPATHOLOGY （ 影响因子：1.789； 五年影响因子：1.574 ）

ISSN： 0931-1785

年卷期： 2014 年 162 卷 9 期

页码：

收录情况： SCI

摘要： A field survey was conducted to determine the relationship between Ralstonia solanacearum diversity and severity of bacterial wilt disease in tomato plants grown in plastic greenhouses. Both vegetative and reproductive stages of the plants were surveyed, and the symptoms were empirically categorized into five scales: 0 (asymptomatic): 1st, 2nd, 3rd and 4th. The bacterial wilt pathogen was isolated from infected plants at each disease scale; pathogenic characteristics and population densities of the bacterial strains were assessed. Two hundred and eighty-two isolates were identified as R. solanacearum, which were divided into three pathogenic types, virulent, avirulent and interim, using the attenuation index (AI) method and a plant inoculation bioassay. Ralstonia solanacearum was detected in all asymptomatic and symptomatic tomato plants, with population numbers, ranging from 10.5 to 86.7 x 105 cfu/g. However, asymptomatic plants harboured only avirulent or interim R. solanacearum, whereas tomato plants displaying 1st or 2nd disease degree contained interim and virulent strains. Additionally, 3rd and 4th degree plants harboured only virulent strains. The disease was more severe in vegetative-stage plants (disease severity index (DSI) 0.20) with higher total numbers of interim and virulent R. solanacearum strains than those in reproductive-stage plants (DSI 0.12). Three pathotypes of R. solanacearum coexisted in a competitive growth system in the tomato field, and their distribution closely correlated with the severity of tomato bacterial wilt.

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