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. 2023 Aug 25;23:407. doi: 10.1186/s12870-023-04403-8

Fig. 2.

Fig. 2

A schematic overview of the processes used by plant growth promoting rhizobacteria to alleviate drought stress and promote plant growth. A. Plant growth promoting rhizobacteria improve general traits of plant growth. Inoculation with PGPR increased the growth rate and general developmental of plants compared to the non-inoculated control (on the left). PGPR enhance root system architecture, root and shoot growth and weight, height, and early plant flowering. B. Functional processes used by plant growth promoting rhizobacteria to promote plant growth: PGPR colonization of plant roots enlarges root architecture and enhances, nutrient and water uptake, nitrogen fixation, phytohormone production, enzyme production, photosynthetic activity and other processes. PGPR: Plant Growth Promoting Rhizobacteria; ACC: 1- AminoCyclopropane-1-Carboxylate; CK; Cytokinin; ET: Ethylene; Fe; Iron; GA: gibberellic acid; IAA: indole-3-acetic acid; N: Nitrogen; NH3: ammonia; NH4+: ammonium; P: Phosphate; L-Trp: L-tryptophan; VOC: volatile organic compound