Figure 1.

Macro‐ and microscopic views of Ralstonia solanacearum and illustration of associated symptoms on plant bioassays. (a) Ralstonia solanacearum growing on complete BG medium (Boucher et al., 1985). The pink colour of the colonies is caused by the presence of triphenyl tetrazolium chloride in the medium. (b) Electron microscopy image of R. solanacearum rod‐shaped cells under division displaying pili structures (by the late Jacques Vasse). (c) Symptoms of bacterial wilt on Medicago truncatula plants. Inoculation in Jiffy pots with two wild‐type strains (top part). Gnotobiotic inoculation with a wild‐type strain and an hrp mutant (bottom part). (d) Symptoms of bacterial wilt on Arabidopsis thaliana plants. (e) Symptoms of bacterial wilt on tomato plants. (f) One eggplant with symptoms of bacterial wilt, and a healthy control plant.