A simplified synthetic community rescues Astragalus mongholicus from root rot disease by activating plant-induced systemic resistance

• DOI: 10.1186/s40168-021-01169-9
• Publication Date: 2021-11-04T02:02:31Z
• Authors: Zhefei Li; Xiaoli Bai; Shuo Jiao; Yanmei Li; Peirong Li; Yan Yang; Hui Zhang; Gehong Wei
• Keywords: Stenotrophomonas; Stenotrophomonas maltophilia

Abstract Background Plant health and growth are negatively affected by pathogen invasion; however, plants can dynamically modulate their rhizosphere microbiome adapt to such biotic stresses. Although plant-recruited protective microbes be assembled into synthetic communities for application in the control of plant disease, microbial commonly contain some taxa at low abundance. The roles low-abundance remain unclear; it is also unclear whether all enriched enhance host adaptation environment. Here, we a community with disease resistance function based on differential analysis root-associated bacterial composition. We further simplified investigated bacteria Astragalus mongholicus root rot simple community. Results Fusarium oxysporum infection reduced Shannon diversity significantly composition roots . Under fungal challenge, recruited beneficial as Stenotrophomonas , Achromobacter Pseudomonas Flavobacterium roots. constructed disease-resistant containing 10 high- three diseased After joint selection pathogens, complex was four-species composed high-abundance ( sp., Rhizobium Ochrobactrum sp.) one bacterium Advenella sp.). Notably, these four strains thirteen-species had similar effects disease. Furthermore, protected via synergistic effect highly abundant inhibiting less activating plant-induced systemic resistance. Conclusions Our findings suggest that abundance play an important role only few associated Therefore, construction simplification found present study could strategy employed environmental stress.