Fig. 1From: PGPR strain Paenibacillus polymyxa SQR-21 potentially benefits watermelon growth by re-shaping root protein expressionSchematic representation of the experimental design with the hydroponic split-roots system, which allows SQR-21 and watermelon roots co-cultured together in one half box, and the remaining half roots at the other half box were not contaminated by the strainBack to article page