Drought and salinity act simultaneously in tolerance and acclimatization under saline conditions. Therefore, plants subjected to these types of stress should have developed specific structural adaptations at the early stages of development. The solution to these environmental problems is to look for species that are relatively water-efficient and resistant to recurrent episodes of various abiotic stresses such as salt stress. In this study, the salinity tolerance index, ionic homeostasis and osmoprotection were evaluated in A. karroo and A. saligna plants of 90 days old and cultured at various concentrations of NaCl for 21 days. Results showed that salt caused remarkable changes in some growth-related parameters (dry biomass) represented by the salinity tolerance index (STI). Na + , Ca 2+ , and RatioNa+/K+ content in the leaves increased with salinity levels, while K + contents were significantly reduced compared to the control in both acacia species. Levels of proline, total free amino acids and reducing sugars have been accumulated considerably in the leaves. A. karroo was more salt-tolerant than A. saligna. Our results showed that the adaptability of a species to salinity is closely related to ion selectivity and biomass production. The seedlings also accumulated significantly a set of important osmolytes in leaves under salt stress, showing a marked increase in secondary metabolite accumulation. This adaptation proved very specific to each species for better survival in saline environments.
Lactic acid bacteria play a key role in maintaining the balance of normal gastro-intestinal microflora. Food contamination by Staphylococcus aureus is a major problem for consumer's health in Algeria, especially during the summer period. The use of bacterial interactions is a new way to limit the pathogenic germs growth. Detection of antimicrobial substances produced by lactic acid bacteria against the undesirable germs is the objective of this work. Microbiological and biochemical methods were used to identify lactic acid bacteria having an antimicrobial activity. The 02 isolates of lactic acid bacteria obtained from raw goats' milk in western Algeria areas were identified as: Lactobacillus rhamnosus and Lactobacillus plantarum. The interactions study revealed that two lactobacilli species: L. plantarum (58) and L. plantarum (68) are able to inhibit S. aureus' growth. In mixed culture after 24 h, L. plantarum reduces the growth of S. aureus by 1.6 log and this latter bacteria was not found after 72 h. The various tests used revealed the proteinic nature of the substance, which was responsible of the growth inhibition of S. aureus. The ecological adaptation and growth characteristics of cultures of L. plantarum in food products will determine their effectiveness as biocontrol agent in dairy foods.
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