Effect of salinity on the adhesive power actinomycetes in soil

Actinomycetes remain one of the leading sources of microbial-derived natural products. Able to colonize various ecological niches including the most extreme, they are, increasingly, concerned research materials of microbial physiology from adverse circumstance. In this work, actinomycetes were isolated from soils of the region Beni Amir, Morocco, where the salinity is, relatively, high degrees. Glycerol Bacto Agar medium (GBA) and Bennet medium were used for the isolation and growth of actinomycetes. To promote the activities of actinomycetes, by predicting biofilm formation, their characters surface and adhesion on soil was studied. The adhesive behaviour estimation is based on sedimentation of the bacteria adsorbed to substrata power and expressed as the percentage of cells adhered to substrata. Physico-chemical characters of surface cells were estimated by measurement of the water and different solvents contact angle on a lawn of cells. The percentage of cell adhered on soil increase by adding salt in growth medium or in bacterial suspension. Physicochemical characterization of our strains revealed a hydrophilic and electron donor character. Nevertheless, cell surface hydrophobicity increases with salinity, while electron donor character seems not be affected by salt.