“…Some strains can maintain the non-producing strains against drought stress by producing secondary metabolites, such as exopolysaccharides [ 81 ]. A study showed that microorganisms belonging to the roots of grapevine and olive plants can improve the growth of Orize sative L. This enhancement may be due to the extensive roots system and increased water uptake ability [ 82 , 83 ]. In addition, it has been found that using humic acid and PGPR ( B.megaterium and B. subtilis ) enhanced the plant height and yield compared with untreated control.…”