Alleviation of Salt Stress via Habitat-Adapted Symbiosis

Halotolerant plant-growth-promoting rhizobacteria (PGPR) could not only promote plant growth, but also help in counteracting the detrimental effects of salt stress. In present study, a total 76 bacteria were isolated from rhizosphere, non-rhizospheric soil and endophytes halophyte Salsola tetrandra, collected natural saline soils Algeria. Phylogenetic analysis based on 16S rDNA sequence Gram-negative (n = 51) identified, showed seventeen representative isolates grouped into four genera (Pseudomonas, Acinetobacter, Enterobacter, Providencia). These bacterial that exhibited different PGPR traits selected tested for their ability to tolerate abiotic stress (NaCl, PEG8000, pH). The majority drought tolerant (60% PEG8000) had an optimal growth at high pH values (pH 9 11) some strains tolerated 2 M NaCl. Strains identified as Enterobacter xiangfangensis BE1, Providencia rettgeri BR5 Pseudomonas stutzeri MLR6 capacity adaptation PGP traits. salt-tolerant finally chosen enhance tolerance, separately or combined, Arabidopsis thaliana (Col-0) exposed 0.1 NaCl, by following fresh root weight, primary elongation lateral number. best effect was recorded strain increasing shoot weight BE1 terms absence At stressed conditions, all parameters declined. However, inoculation with three (MLR6, BR5), single co-culture, conferred increase length use these combined biofertilizers seems be powerful tool development sustainable agriculture soils.