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Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Several phenotypic tests were used in this study to determine the biodiversity of rhizobial strains nodulating Medicago ciliaris L. Phenotypic characteristics of thirty-seven rhizobia strains isolated from root nodules of Medicago ciliaris L. growing in soils collected from Zerizer (north eastern Algeria) were studied. Tolerance to salinity, high temperatures, acid and alkaline pHs, drought and antibiotics and symbiotic and cultural characteristics allowed the description of a wide physiological diversity among tested isolates. Thirteen isolates from the total could grow at 45°C. Only six isolates grew at 4% NaCl. Furthermore, the isolates that showed tolerance to salinity stress also showed tolerance to water stress, indicating direct relationships between these two physiological pathways. High salt- and water stress-tolerant strains were isolated and tested for their ability to fix biological nitrogen. Seven isolates were phenotypically categorised as Agrobacterium. [ABSTRACT FROM AUTHOR]