The role of glycine betaine and choline in osmoprotection of various Rhizobium, Sinorhizobium, Mesorhizobium, Agrobacterium, and Bradyrhizobium reference strains which display a large variation in salt tolerance was investigated. When externally provided, both compounds enhanced the growth of Rhizobium tropici, Sinorhizobium meliloti, Sinorhizobium fredii, Rhizobium galegae, Agrobacterium tumef...

Plants are generally subjected to a combination of different conditions such as magnetic field and soil bacteria in their life. The present investigation tried to compare the effects and interactions of magnetic field and rhizobial inoculant in alfalfa. A pot experiment was performed under a natural condition by a factorial design to ...

The strains of nodule bacteria differ greatly in their symbiotic properties and efficiency nitrogen fixation therefore, the selection highly effective is great importance when attempting to achieve a successful pre-sowing inoculation common bean. aim this study was determine nodulation ability indigenous rhizobial evaluate compatibility efficacy with two bean cultivars. A two-factorial pot expe...

An interrelationship between introduced and indigenous rhizobia focused on their competitiveness in nodulation was evaluated in a soil pot experiment. Clover seeds were inoculated by six different gradual concentrations of inoculum of two effective Rhizobium leguminosarum bv. trifolii isolates (inoculation strains 1/2 and 14/2). At the beginning of flowering, clover plants were removed from the...

We have examined nutritional factors influencing conjugal transfer of the two nonsymbiotic large plasmids, pRmeGR4a and pRmeGR4b, of Rhizobium meliloti GR4. To monitor transfer, each plasmid was tagged with a different antibiotic resistance marker. Transfer of plasmid pRmeGR4b was dependent upon the presence of plasmid pRmeGR4a on the same donor cell. Transconjugants for pRmeGR4b were obtained ...

Abstract Purpose The increase in frequency of freeze–thaw episodes with the diminution snow cover protection due to climate change compromises winter survival alfalfa ( Medicago sativa L.). Symbiosis cold-tolerant rhizobial strains can improve ability survive and grow under stressful conditions. Methods Six Sinorhizobium (Ensifer) meliloti were tested combination two populations bred differ the...

Six woody legume tree species, Acacia ehrenbergiana (Hayne.), Acacia nilotica (Willd.), Acacia saligna (Labill.), Acacia tortilis (Forssk.), Acacia tortilis var. reddiana ( Savi.) and Leucaena leucocephala (Lam.) were performed the growth characteristics and to identify the resistance of native isolated Rhizobium strains from root zone surrounding trees to environmental stressesantibiotic, high...

Three slow-growing rhizobial strains, designated RITF806(T), RITF807 and RITF211, isolated from root nodules of Acacia melanoxylon grown in Ganzhou city, Jiangxi Province, China, had been previously defined, based on amplified 16S rRNA gene restriction analysis, as a novel group within the genus Bradyrhizobium. To clarify their taxonomic position, these strains were further analysed and compare...

Thirty-one strains of two new genomic species (genomic species 1 and 2) of rhizobia isolated from root nodules of Phaseolus vulgaris and originating from various locations in France were compared with reference strains of rhizobia by performing a numerical analysis of 64 phenotypic features. Each genomic species formed a distinct phenon and was separated from the other rhizobial species. A comp...