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Insights into plant and bacterial associations, along with their genome mining, have paved the way for the improvement of the agriculture sector. Initially, 69 morphologically different bacterial strains were isolated from 6 different extreme environment samples. For  in vitro  screening of plant growth-promoting bacteria, auxin, hydrogen cyanide, and antibiotic production along with phosphate solubilization potential was estimated. Only 15 strains exhibited noteworthy production of plant growth-promoting compounds.  Ochrobactrum ciceri  CS-10 fostered  Triticum aestivum  and  Zea mays  seedling root growth remarkably (104.12 and 159%, respectively), while  Bacillus australimaris  TP-10 significantly increased the number of leaves in  T. aestivum  (166.66%) and  Z. mays  (133.33%) seedlings. These strains also boosted seedling biochemical traits, like indole acetic acid, peroxidase, and soluble protein content. Particularly,  O. ciceri  elevated peroxidase content greatly in  T. aestivum  (249.7%) and  Z. mays  (260.5%). Scanning electron micrographs of inoculated roots revealed the aggregation of cells at the roots of  Z. mays,  whereas single cells/micro-colonies were observed on  T. aestivum  roots. For  in silico  analysis, AntiSMASH was used for genome mining of the environmental  Ochrobactrum  sp. and  B. australimaris  reference genome. This genome mining unveiled diverse gene clusters encoding; terpenes, beta-lactones, acyl-amino-acids, aryl polyenes, lanthipeptide, and siderophores, etc. Two common biosynthetic gene clusters (terpenes and beta-lactones) were identified in these strains, which can act as plant growth promoters. This symbiotic plant–bacteria relationship has promising ecological and economic implications, offering avenues for beneficial applications.

In vitro and in silico study for plant growth promotion potential of indigenous Ochrobactrum ciceri and Bacillus australimaris