Rhizobia Indigenous to the Okavango Region in Sub-Saharan Africa: Diversity, Adaptations, and Host Specificity.

摘要: The rhizobial community indigenous to the Okavango region has not yet been characterized. isolation of rhizobia can provide a basis for formulation inoculant. Moreover, their identification and characterization contribute general understanding species distribution ecology. Isolates were obtained from nodules local varieties pulses cowpea, Bambara groundnut, peanut, hyacinth bean, common bean. Ninety-one them identified by BOX repetitive element PCR (BOX-PCR) sequence analyses 16S-23S rRNA internally transcribed spacer (ITS) recA, glnII, rpoB, nifH genes. A striking geographical was observed. Bradyrhizobium pachyrhizi dominated at sampling sites in Angola which characterized acid soils semihumid climate. semiarid Namibia more diverse, with most being related yuanmingense daqingense. Host plant specificity observed only nodulated presumably representing yet-undescribed species. Furthermore, isolates respect adaptation high temperatures, drought, host plants. experiments revealed that Namibian shared an exceptionally temperature tolerance, but none showed considerable drought. isolates' performance on different hosts variable results, inducing better nodulation peanut bean than Angolan strains. predominance distinct genotypes implies strains may exhibit inoculant formulations.