Effect of salt-tolerant plant growth-promoting rhizobacteria on wheat plants and soil health in a saline environment

Salt-tolerant plant growth-promoting rhizobacteria (ST-PGPR) significantly influence the growth and yield of wheat crops in saline soil. Wheat growth improved in pots with inoculation of all nine ST-PGPR (ECe=4.3 dS center dot m(-1); greenhouse experiment), while maximum growth and dry biomass was observed in isolate SU18 Arthrobacter sp.; simultaneously, all ST-PGPR improved soil health in treated pot soil over controls. In the field experiment, maximum wheat root dry weight and shoot biomass was observed after inoculation with SU44 B.aquimaris, and SU8 B.aquimaris, respectively, after 60 and 90days. Isolate SU8 B.aquimaris, induced significantly higher proline and total soluble sugar accumulation in wheat, while isolate SU44 B.aquimaris, resulted in higher accumulation of reducing sugars after 60days. Percentage nitrogen (N), potassium (K) and phosphorus (P) in leaves of wheat increased significantly after inoculation with ST-PGPR, as compared to un-inoculated plants. Isolate SU47 B.subtilis showed maximum reduction of sodium (Na) content in wheat leaves of about 23% at both 60 and 90 days after sowing, and produced the best yield of around 17.8% more than the control.