Functional redundancy of genes for sulphate activation enzymes in Rhizobium sp. BR816

Article Abstract:

A study was conducted on the isolation of the nodPQ genes from Rhizobium sp BR816, a broad-host-range bacterium related to Sinorhizobium meliloti. Plant inoculation analysis did not indicate differences between the mutant strain and the wild-type. Moreover, it appears that a third, functionally homologous locus complements mutations in the Nod factor sulphation genes. Southern blot analysis also indicates that this locus has genes necessary for the sulphation of amino acids.

Bacterial genetics, Sulfates

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Rhizobium tropici chromosomal citrate synthase gene

Article Abstract:

Nucleotide sequences of the two genes, one chromosomal and the other plasmid-borne, which encode citrate synthase in Rhizobium tropici, are similar in the structural region but different in the regulatory region. Although the expressions of the two genes are differential, both of them are functional and contribute to during nodulation and nitrogen fixation. Mutation of the plasmid-borne gene affects nodulation more than the mutation of chromosomal gene.

Enzymes, Gene expression, Enzyme synthesis, Microbial mutation, Nitrogen, Nitrogen fixation

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Phylogenetic relationships and host range of Rhizobium spp. that nodulate Phaseolus vulagaris L

Article Abstract:

Phylogenetic analysis of nucleotide sequence of 16S rRNA gene segements of five Rhizobium strains obtained from 22 tropical legume species shows that these strains are of two different chromosomal lineages and they all are capable of nodulating beans.

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