The Mechanisms of Sodium Chloride Stress Mitigation by Salt-Tolerant Plant Growth Promoting Rhizobacteria in Wheat

We investigated the growth-promoting mechanism of salt-tolerant plant growth promoting rhizobacteria (ST-PGPR) in wheat under sodium chloride (NaCl) stress by measuring and physiological biochemical responses plants inoculated with ST-PGPR 0–400 mM NaCl. The results showed that plays a significant role NaCl stress. Under 300 NaCl, three strains increased height, root length, dry weight, fresh weight 71.21%, 89.19%, 140.94%, 36.31%, respectively, compared to control group. proline soluble sugar contents Bacillus thuringiensis 38.8% 21.4%, respectively. average content antioxidant enzymes 13.89%, control, species ST-PGPR, ethylene decreased 2.16-fold. In addition, mathematical model based on “interaction equation” revealed best mixed inoculation were due complementary strengths strains. analysis experimental phenomena data mechanisms which Brevibacterium frigoritolerans, thuringiensis, velezensis alleviate wheat: (1) lowering osmotic stress, oxidative (2) using secretions provide substances needed for wheat. This study provides new approach comprehensive understanding evaluation as biological inoculant crops salt