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Abstract In order to understand the genetic diversity of the pathogen of peanut bacterial wilt in Guangdong Province, 64 strains were isolated from wilt peanut plants of main planting in Guangdong Province in recent years, among which 31 were Ralstonia solanacearum strains. Genetic diversity analysis of the 31 R. solanacearum strains demonstrated that they all belonged to phylotype I. The R. solanacearum strains from different places were randomly selected for pathogenicity analysis. The result showed that the pathogenicity of these strains was different. Among them, the pathogenicity of strain ZKRS126 from Zhanjiang was obviously varietyspecific. It showed strong pathogenicity to peanut A300 but weak pathogenicity to peanut A281. In addition, the pathogenicity of strains with close genetic relationship was also significantly different. The pathogenicity of ZKRS126 and ZKRS206 to peanut A300 was significantly different. This study will contribute to the control and research of peanut bacterial wilt in Guangdong Province, and provide basic data and supporting materials for the subsequent research and breeding of resistant peanut varieties.
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Received: 30 September 2022
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2022, Vol. 35 
