Table 2.

PGPR’s mechanisms to alleviate drought stress in plants.

Bacteria	EPS Mechanism	Crop	Reference
Bacillus polymyxa CF43	Increases the mass of soil adhering to the roots	Wheat	Bezzate et al. [75]
Pantoea agglomerans NAS206	Augments the root-adhering soil (RAS) in both excessive or deficit water	Wheat	Amellal et al. [129]
Rhizobium sp. YAS34	Increases root-adhering soil (RAS) per root dry mass and soil macropore volume	Sunflower	Alami et al. [109]
Rhizobium sp. KYGT207	Enhances root-adhering soil (RAS) dry mass (dm) per root dm (RAS/RT) and RAS aggregate water stability	Wheat	Kaci et al. [136]
Pseudomonas putida GAP-P45	Improves soil aggregates stability	Sunflower	Sandhya et al. [71]
Pseudomonas entomophila BV-P13	Influence higher soil aggregates stability and mean weight diameter of root-adhering soil (RAS)	Maize	Sandhya et al. [120]
Pseudomonas stutzei GRFHAP-P14
Pseudomonas putida GAP-P45
Pseudomonas syringae GRFHYTP52
Pseudomonasmonteilli WAPP53
Bacillus sp. HYD-B17	Increase root-adhering soil (RAS) dry mass (dm) per root dm (RAS/RT) and weight diameter of soil aggregates	Maize	Sandhya et al. [14]
Bacillus sp. HYTAPB18
Bacillus sp. HYDGRFB19
Bacillus sp. BKB30
Bacillus sp. RMPB44
Pseudomonas aeruginosa B2	Augment soil aggregates stability	Maize	Putrie et al. [141]
Brevibacillus brevis B33
Proteus penneri Pp1	Enhance moisture and water content of soil	Maize	Nassem and Bano [138]
Pseudomonas aeruginosa Pa2
Alcaligenes faecalis AF3
Azotobacter sp. AztRMD2	Augment soil aggregates stability	Rice	Sivapriya et al. [142]
Bacillus amyloliquefaciens FZB42	Plant protection by enhancing biofilm stability	Arabidopsis thaliana	Lu et al. [110]
Pseudomonas aeruginosa MCCB0035	Increase moisture and water content of soil	Okra Plant	Yadav et al. [143]
Bacillus coagulans MCCB0059
Planomicrobium chinese P1	Maintain high moisture content in soil	Wheat	Khan and Bano [47]
Bacillus cereus P2