Plant growth promoting rhizobacteria (PGPR) promote plant growth and activate defense response against phytopathogens. At the subcellular level plant-PGPR interaction is less understood, which would be essential for future improvement(s) of PGPR formulations. In a rigorous screening process, that also involved efficient PGPR strains, Bacillus sonorensis RS4 was selected to study partner-triggered interactions. The potential of B. sonorensis RS4 to improve growth of groundnut, efficiency to colonize roots, and influence on root topology was assessed. Twenty four cell wall proteins of B. sonorensis RS4 [in presence of groundnut root exudates (REs)], and 22 groundnut root proteins (in RS4-bacterized plants) were differentially expressed. The alterations in cell wall proteins of B. sonorensis RS4 were primarily related to the amino acids synthesis, chemotaxis, antioxidant-metabolism, carbohydrate metabolism, transporters, and antibiosis-related secondary metabolites. Root proteins that were differentially expressed during the interaction may be involved in plant growth, defense responses, and in transportation. The changes in B. sonorensis RS4 cell wall proteome and groundnut root proteome, suggest that at least a part of the proteome changes triggered by each of the partners appear to play a significant role in helping each other akin to symbiosis.

促进根瘤菌生长的植物（PGPR）促进植物生长并激活针对植物病原体的防御反应。在亚细胞水平上，对植物-PGPR相互作用的了解较少，这对于PGPR制剂的未来改进至关重要。在严格的筛选过程中（也涉及有效的PGPR菌株），选择了Bonillus sonorensis RS4来研究伴侣触发的相互作用。评估了B. sonorensis RS4改善花生生长，根部定植效率以及对根系拓扑结构的影响的潜力。sonorensis的二十四种细胞壁蛋白RS4 [存在花生根系分泌物（REs）]和22种花生根系蛋白质（在经RS4杀菌的植物中）差异表达。B. sonorensis RS4细胞壁蛋白的变化主要与氨基酸合成，趋化性，抗氧化剂代谢，碳水化合物代谢，转运蛋白和抗微生物相关的次级代谢产物有关。在相互作用过程中差异表达的根蛋白可能参与植物生长，防御反应和运输。在这些变化B. sonorensis RS4细胞壁蛋白质和花生根蛋白质组，建议至少蛋白质组的一部分，通过改变每一个合作伙伴触发出现在互相帮助类似于共生发挥显著作用。