ENVIRONMENTAL STRESS RESISTANCES OF ROOT-NODULE BACTERIA FROM MEDICAGO FALCATE L.

• Main Authors: Zultsetseg Ch, Selitskaya O V, Gerelmaa Z, Rentsenkhand Ts
• Format: Article
• Language: English
• Published: Mongolian Academy of Sciences 2018-09-01
• Series: Proceedings of the Mongolian Academy of Sciences
• Subjects: Medicago falcate L; root nodule bacteria; environmental stress
• Online Access: https://www.mongoliajol.info/index.php/PMAS/article/view/1005

<p>The symbiotic system of Legumes and root-nodule bacteria is a significant process for enriching barren and dry soils and supporting plant growth. The aim of this study was to isolate root-nodule bacteria from Medicago falcate and to select high activity strains with resistance to environmental stress. <br />As a result, only MSZ-25 strain grew in the medium containing 0.8M NaCl, with pH4.8-9.8 and at temperatures of 4-45°С. All rhizobial isolates were tolerant to the concentrations of 0.01-0.1% Pb(NO₃)₂, 0.01% ZnSO₄, CdCI₂, CuCI₂ and NiCI₂. The strains were also resisted to penicillin 10μ/ml, erythromycin 10μ/ml, and chlorampenicol 10μ/ml but the growths of all isolates were inhibited by kanamycin 30μ/ml, novobiocin 30μ/ml and tetracycline 10μ/ml.</p>