Some plants nurture soil bacteria that keep them healthy - Probiotics for vegetables
▻https://www.economist.com/science-and-technology/2018/10/11/some-plants-nurture-soil-bacteria-that-keep-them-healthy
These findings suggest to Dr Lee and Dr Kim that the roots of [a variety of tomato called] Hawaii 7996 are releasing compounds which encourage the growth of TRM1. What those compounds are has yet to be determined. But the two researchers’ work suggests at least three ways in which bacterial wilt might be tackled. One is to apply TRM1 itself to the soil, if it can be cultured in sufficient quantities. The second is to apply the stimulating chemicals to soil, once they have been identified. The third is to tweak the DNA of vulnerable crops to produce the stimulating chemicals directly.