Next SOL Seminar Online will be presented by Corri Hamilton on Xylem sap from wilt-resistant tomato inhibits growth of the pathogen Ralstonia solanacearum
Abstract. The soilborne plant pathogen Ralstonia solanacearum (Rs) causes lethal bacterial wilt disease (BWD) by colonizing water-transporting xylem vessels. Rs reduces crop yields at every level of production from small- to large-scale farming operations. Rs is a geographically diverse species complex that infects over 200 different plant species including banana, ginger, potato and tomato. Plaw1nting resistant crop varieties is the optimal way to control plant diseases, and most BWD resistance in tomato derives from breeding line H7996. This resistance is conferred by several quantitative trait loci and the underlying mechanism(s) are not understood. Moreover, some Rs strains can overcome H7996 resistance, increasing our need to understand this form of resistance. Tomato xylem sap is relatively low in nutrients, and Rs grew equally poorly in sap harvested from either wilt-susceptible or wilt-resistant tomatoes. However, sap collected from wilt-susceptible tomato plants that were infected with Rs supported better bacterial growth than sap from uninfected plants, suggesting this pathogen manipulates the plant to improve its xylem habitat. We hypothesize that xylem sap from BWD-resistant plants restricts Rs virulence by chemically inhibiting pathogen growth, not by carbon starvation. To test this hypothesis, we are characterizing compounds found in H7996 xylem sap that contribute to BWD resistance. These findings will further our understanding of how this devastating plant pathogen succeeds or fails in the harsh tomato xylem environment.
When? Friday 13th November 3 pm (GMT+1)
The zoom link to join the meeting is https://cuboulder.zoom.us/j/94333146166 Meeting ID: 943 3314 6166, password: Solanaceae
Watch again this talk: https://youtu.be/cYjw_xmOipw