Screening of Some Fungi and Bacteria Improving Date Palm Resistance to Salinity Stress

Soil and water salinity is one of the serious and developing problems in the world, and large areas of the countrys land are also facing this problem. The use of fungal and bacterial microorganisms, which are considered the most important soil microorganisms, has become a global solution to reduce environmental stresses such as salinity. Therefore, in order to investigate the effect of fungi and bacteria improve the resistance of date palms to salt stress, an experiment was conducted in Shadgan city in Khuzestan province. In order to screen salt-resistant fungal strains, 36 strains fungi isolated from the date palm rhizosphere zone were cultured in concentrations of  zero, 2500, 5000, 7500, 10000, 12500, 15000 mg/liter of sodium salt. The average diameter growth and inhibition percentage showed that the lowest inhibition percentage due to salt salinity was observed in Fusarium solani, Aspergillus niger, Pencillium chrysoyenum, Aspergillus tubingensis. The use of salinity-resistant fungis in the form of elicitors is recommended under salinity stress conditions. However, considering the role of Fusarium solani fungus in Date root rot disease, the application of this fungus needs more extensive studies. Biological screening of bacteria the ACC-Deaminase production evaluation method showed that Bacillus Pumilus and Bacillus safensis bacteria have the ability to produce more enzymes. This enzyme breaks the precursor of ethylene production under stress conditions and prevents the production of ethylene Wich is produced under stress  conditions.