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• W3165749964 abstract "Abstract Crop losses to plant pathogens are a growing threat to global food security, and hence, more effective control strategies are urgently required. Biofumigation, an agricultural technique, where Brassica plant tissues are mulched into soils to release antimicrobial plant allelochemicals called isothiocyanates (ITCs), has been proposed as an environmentally friendly alternative to synthetic agrochemicals. While biofumigation has been shown to suppress a range of plant pathogens, its effects on plant pathogenic bacteria remain largely unexplored. Here we used a laboratory model system to compare the efficacy of different types of ITCs against Ralstonia solanacearum plant bacterial pathogen. Additionally, we evaluated the potential for ITC-tolerance evolution under high, intermediate and low transfer frequency ITC exposure treatments. We found that allyl-ITC was the most efficient compound at suppressing R. solanacearum growth, and its efficacy was not improved when combined with other types of ITCs. Despite consistent pathogen growth suppression, ITC tolerance evolution was observed in the low transfer frequency exposure treatment. Mechanistically, tolerance was associated with parallel mutations in a gene linked to glucose/sorbonose dehydrogenase, resulting in cross-tolerance to ampicillin beta-lactam antibiotic. Interestingly, pathogen adaptation to the growth media also indirectly selected for increased ITC tolerance through potential metabolic adaptations linked with cell wall structure (serine/threonine kinase) and DNA replication, recombination and repair (deoxyribonucleases). Together, our results suggest that R. solanacearum can rapidly evolve tolerance to allyl-ITC plant allelochemical, which could constrain the long-term efficiency of biofumigation biocontrol and potentially shape pathogen evolution with plants. Importance Several alternatives to agrochemicals have been proposed to reduce crop losses to plant pathogens. One such strategy is called biofumigation, which is a biocontrol technique based on natural plant allelochemicals, such as isothiocyanates (ITCs), that have antimicrobial activity against plant pathogens. Here we show that while one such compound, allyl-ITC, is effective at suppressing the growth of notorious Ralstonia solanacearum plant pathogenic bacterium, increased tolerance evolves rapidly, leading to cross-tolerance to the beta-lactam antibiotic, ampicillin. Mechanistically, ITC tolerance was linked to mutations in a putative glucose/sorbonose dehydrogenase gene, which has previously been linked to resistance to clinical antibiotics in other pathogens. Together, our results suggest that plant pathogenic bacteria can rapidly evolve tolerance to antimicrobial compounds produced by plants via similar mechanisms by which they evolve resistance to clinical antibiotics. Potential pathogen tolerance evolution should thus be considered when developing new biocontrol methods based on pathogen growth inhibition." @default.
• W3165749964 created "2021-06-07" @default.
• W3165749964 creator A5011738830 @default.
• W3165749964 creator A5062733921 @default.
• W3165749964 date "2021-05-22" @default.
• W3165749964 modified "2023-10-15" @default.
• W3165749964 title "Plant pathogenic bacterium can rapidly evolve tolerance to an antimicrobial plant allelochemical" @default.
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• W3165749964 doi "https://doi.org/10.1101/2021.05.21.445234" @default.
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