TABLE 5.

Improvement in phytohormone production by PGPR under drought stress.

Soil microbe/Strain	Plant species	Effect under drought	References
P. brassicacearum STM196	Arabidopsis	Enhanced ABA decreased leaf transpiration	Bresson et al., 2013
G. diazotrophicus PAL5	Sugarcane	Inoculation activated the ABA-dependent signaling genes conferring drought resistance	Vargas et al., 2014
Azospirillum sp.	Wheat	IAA enhanced root growth, lateral roots formation, and increased uptake of water and nutrients	Hosseini et al., 2017
Bacillus amyloliquefaciens S-134	Wheat	Higher IAA production under water stress	Raheem et al., 2018
M. luteus S4.43	Sunflower	Enhanced the IAA production under drought	Namwongsa et al., 2019
H. huttiense RCA24	Rice	IAA producer under drought stress	Andreozzi et al., 2019
B. endophyticus J13 B. tequilensis J12	Tomato	Stress-induced increase in the levels of phytohormones, gibberellic acid, auxin, and cytokinin	Ghosh et al., 2019
B. subtilis DHK	Maize	Production of IAA and stimulates the transcription of ACC synthase enzyme	Sood et al., 2020