Tunchai, Mattana

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Tunchai, Mattana
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mattana.tu@kmitl.ac.th

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    Item type:Publication,
    Chemotactic disruption as a method to control bacterial wilt caused by Ralstonia pseudosolanacearum
    (2021-03-01)
    Tunchai, Mattana
    ;
    Hida, Akiko
    ;
    Oku, Shota
    ;
    Tajima, Takahisa
    ;
    Kato, Junichi
    We have demonstrated that chemotaxis to l-malate facilitated motility of Ralstonia pseudosolanacearum MAFF 106611, a causative agent of bacterial wilt, to plant roots. Here, we evaluated the assumption that the disruption of chemotaxis to l-malate leads to inhibition of plant infection by R. pseudosolanacearum MAFF 106611. Chemotactic assays revealed that chemotaxis to l-malate was completely or partially inhibited in the presence of l-, d-, and dl-malate, respectively. Moreover, l-malate served as a carbon and energy source for R. pseudosolanacearum MAFF 106611, while d-malate inhibited the growth of this bacterium. In the sand-soak inoculation virulence assay for tomato plants, the addition of l-, d-, and dl-malate to sand suppressed the plant infection. We concluded that supplementation of l- and dl-malate suppresses tomato plant infection with R. pseudosolanacearum MAFF 106611 by disrupting its chemotaxis to l-malate, while d-malate suppresses it by both the disruption of l-malate chemotaxis and inhibition of growth.