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Multilocus sequence analysis reveals multiple symbiovars within Mesorhizobium s...
Laranjo, Marta; Young, J. Peter W.; Oliveira, SolangeThe genus Mesorhizobium includes species nodulating several legumes, such as chickpea, which has a high agronomic importance. Chickpea rhizobia were originally described as either Mesorhizobium ciceri or M. mediterraneum. However, rhizobia able to nodulate chickpea have been shown to belong to several different species within the genus Mesorhizobium. The present study used a multilocus sequence analysis approac...
Chickpea rhizobia symbiosis genes are highly conserved across multiple Mesorhiz...
Laranjo, Marta; Alexandre, Ana; Rivas, Raul; Velázquez, Encarna; Young, J. Peter W.; Oliveira, SolangeABSTRACT Chickpea has been considered as a restrictive host for nodulation by rhizobia. However, recent studies have reported that several Mesorhizobium species may effectively nodulate chickpea. With the purpose of investigating the evolutionary relationships between these different species with the ability of nodulating the same host, we analysed 21 Portuguese chickpea rhizobial isolates. Symbiosis genes nifH...
dnaJ is a useful phylogenetic marker for alphaproteobacteria
Alexandre, Ana; Laranjo, Marta; Young, J. Peter W.; Oliveira, SolangeSummary In the past, bacterial phylogeny relied almost exclusively on 16S rRNA gene sequence analysis. More recently, multilocus sequences have been used to infer organismal phylogenies. In this study, the dnaJ chaperone gene was investigated as a marker for phylogeny studies in alphaproteobacteria. Preliminary analysis of G+C and G+C3s contents showed no clear evidence of horizontal transfer of this gene in...
High diversity of chickpea Mesorhizobium species isolated in a Portuguese agric...
Laranjo, Marta; Machado, Jorge; Young, J.Peter W.; Oliveira, SolangeChickpea rhizobia isolated from Portuguese soils were assigned to the genus Mesorhizobium by 16S-rDNA sequencing. High species diversity was found within populations of an agricultural region in the south of Portugal.;Besides the expected Mesorhizobium ciceri and M. mediterraneum, some isolates were close to M. loti or M. tianshanense and some formed a clade that may represent a new species. A new PCR-based app...
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