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- W4224225560 abstract "Extracellular polysaccharide (EPS) is the most important virulence factor of R. solanacearum and promotes rapid systemic colonization and induces plant wilting symptoms. In this study, biological control mechanism and effect of EPS biosynthesis genes mutants (ΔepsB, ΔepsC and ΔwecC) on bacterial wilt were evaluated. The expression level of virulence-associated genes, such as xpsR, epsE, vsrB, vsrC and phcA, were significantly decreased in the Δeps strains. Furthermore, application of ΔepsB strain was observed to delay the development of wilt progress for two days and the WT population in rhizosphere soil was significantly reduced by 46.77-fold after ΔepsB strain treatment. If the ΔepsB was applied earlier than WT population, the control efficiencies of ΔepsB were 84.67%, 72.74%, 60.68%, 56.38% and 53.29% at 8, 10, 12, 14, and 16 d after inoculation, respectively. What ‘s more, the ΔepsB mutant significantly induced the expression of plant defence associated genes involved in salicylic acid pathway, but did not affect the expression of genes associated with the jasmonic acid and ethylene pathways. Compared with plant inoculated with WT treatment, the expression of PR1a/c, PR2 and NPR1 was induced 4.5-fold, 6.9-fold and 2.2-fold, respectively, in the plant colonized by ΔepsB mutant. Meanwhile, application of ΔepsB strain in tobacco rhizosphere significantly induced the accumulation of salicylic acid, with increases of 1.58-fold compared with the control. Taken together, the results suggested that the ΔepsB mutant suppressed bacterial wilt disease by activating salicylic acid signalling and has the potential to be used as biocontrol agents for controlling bacterial wilt caused by R. solanacearum." @default.
- W4224225560 created "2022-04-26" @default.
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- W4224225560 date "2022-05-01" @default.
- W4224225560 modified "2023-10-14" @default.
- W4224225560 title "A epsB mutant of Ralstonia solanacearum as novel biocontrol agent of tobacco bacterial wilt via activating salicylic acid signalling" @default.
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- W4224225560 doi "https://doi.org/10.1016/j.pmpp.2022.101834" @default.
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