Diversity of plant growth promoting Rhizobacteria of Rhus Tripartitus in arid soil of Algeria (Ahaggar) and their physiological properties under abiotic stresses
2018
Asmaa Benaissa | R. Djebbar | A. Abderrahmani
Plant Growth Promoting Rhizobacteria (PGPR) associated with Ucria (Rhus tripartitus) represents a good alternative for including this crop in revegetation programs in arid area. In this study, 137 bacterial strains were isolated in Tryptic Soy Agar medium (TSA) from six samples of ucria’s rhizospheric soil (Ahaggar, Algeria), based on colony characteristics, Gram © reaction, oxidase and catalase tests. To evaluate their PGP activities and their physiological characteristics under stress environment, ten tests were made. Sixty strains of 16 genera were selected for their PGPR abilities, which represent 43.79% to the total of rhizobacteria isolated. The maximum bacterial population were Bacillus (35%). 71.66% of isolates were able to solubilize the phosphate, 31.66% were able to produce Indole Acid Acetic (IAA), 58.33% were siderophore producers, 28,33% were able to produce Cyanhydric Acid (HCN) and 70% were able to grow without any source of nitrogen. Indeed, PGPR strains have shown tolerance and/or resistance to several experimental environmental conditions. As a conclusion, the PGPR strains of Ucria’s rhizosphere were shown a good potential for biofertilization and biocontrol of crops, and their tolerance to abiotic stresses is an interesting step to support their utilities.
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