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Bacterial communities in the rhizosphere play an important role in sustaining plant growth and the health of diverse soils. Recent studies have demonstrated that microbial keystone taxa in the rhizosphere microbial community are extremely critical for the suppression of diseases. However, the mechanisms involved in disease suppression by keystone species remain unclear. The present study assessed the effects of three  Pseudomonas  strains, which were identified as keystone species in our previous study, on the growth performance and root-associated bacterial community of tobacco plants. A high relative abundance of  Ralstonia  was found in the non-inoculated group, while a large  Azospira  population was observed in all groups inoculated with the three  Pseudomonas  strains. Correspondingly, the activities of the defense-related enzymes and the expression levels of the defense signaling marker genes of the plant were increased after inoculation with the  Pseudomonas  strains. Moreover, the correlation analyses showed that the relative abundance of  Azospira , the activity of superoxide dismutase, catalase, and polyphenol oxidase, and the expression of  H1N1 ,  ACC Oxidase , and  PR1 a/c  had a significantly negative ( p &amp;lt;0.05) relationship with the abundance of  Ralstonia . This further revealed that the keystone species, such as  Pseudomonas  spp., can suppress bacterial wilt disease by enhancing the systemic resistance of tobacco plants.

Pseudomonas Inoculation Stimulates Endophytic Azospira Population and Induces Systemic Resistance to Bacterial Wilt