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Among the leguminous trees native to Uruguay,Parapiptadenia rigida (Angico), a Mimosoideae legume, is one of the most promising species for agroforestry. Like many other legumes, it is able to establish symbiotic associations with rhizobia and belongs to the group known as nitrogen-fixing trees, which are major components of agroforestry systems. Information about rhizobial symbionts for this genus is scarce, and thus, the aim of this work was to identify and characterize rhizobia associated withP. rigida . A collection of Angico-nodulating isolates was obtained, and 47 isolates were selected for genetic studies. According to enterobacterial repetitive intergenic consensus PCR patterns and restriction fragment length polymorphism analysis of theirnifH and 16S rRNA genes, the isolates could be grouped into seven genotypes, including the generaBurkholderia ,Cupriavidus , andRhizobium , among which theBurkholderia genotypes were the predominant group. Phylogenetic studies ofnifH ,nodA , andnodC sequences from theBurkholderia and theCupriavidus isolates indicated a close relationship of these genes with those from betaproteobacterial rhizobia (beta-rhizobia) rather than from alphaproteobacterial rhizobia (alpha-rhizobia). In addition, nodulation assays with representative isolates showed that while theCupriavidus isolates were able to effectively nodulateMimosa pudica , theBurkholderia isolates produced white and ineffective nodules on this host.

New Betaproteobacterial Rhizobium Strains Able To Efficiently Nodulate Parapiptadenia rigida (Benth.) Brenan