Bradyrhizobium populations occur in deep soil under the leguminous tree Acacia albida

Article Abstract:

The presence of rhizobia able to nodulate Acacia albida was determined in soil samples taken from various depths from the Sahelian and Sudano-Guinean areas of West Africa. All isolates were Bradyrhizobium sp. and the proportion of effective isolates was similar for the surface and deep soil. The rhizobia populations tended to be greater near the water table than at the surface. Populations were found as deep as 34 meters in the Sahelian area at a concentration of 1320/g of soil. Populations for the Sudano-Guinean area were generally greater at all sampling points and were frequently comparable to that of soils capable of supporting legume crops even at deeper levels.

Soil microbiology, Acacia, Acacia (Plant)

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Genetic diversity and phylogeny of rhizobia that nodulate Acacia spp. in Morocco assessed by analysis of rRNA genes

Article Abstract:

A study was conducted to analyze the genetic diversity among rhizobia determined from various soils and evaluated on four Acacia species, and to determine their phylogenetic positions within the family Rhizobiaceae using 16S rRNA analysis. Experimental results suggested that the internal transcribed spacer between the 16S and 23S rRNA genes could be an effective marker for determining genetic variations at the intergenetic and interspecific levels.

Analysis, Phylogeny, Soils, Soil analysis

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Bradyrhizobium sp. strains that nodulate the leguminous tree Acacia albida produce fucosylated and partially sulfated nod factors

Article Abstract:

The lipo-chitooligosaccharide Nod factors of six different strains of Bradyrhizobium sp. that nodulate Acacia albida have similar structures. Usually, each rhizobial species produces a distinct Nod factor whose structure determines the host range.

Microbial metabolism

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