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Metabolic and Genomic Diversity of Rhizobia Isolated from Field Standing Native and Exotic Woody Legumes in Southern Ethiopia
Ist Teil von
Systematic and applied microbiology, 2004-09, Vol.27 (5), p.603-611
Ort / Verlag
Jena: Elsevier GmbH
Erscheinungsjahr
2004
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Eighty-seven rhizobial strains isolated from root nodules of field standing native and exotic woody legumes in southern Ethiopia were characterized using the Biolog method and AFLP fingerprinting technique. Cluster analysis of the metabolic and genomic fingerprints revealed 18 and 25 groups, respectively, demonstrating considerable diversity in rhizobial population indigenous to Ethiopian soils. While 25 strains (29%) were linked to members of
Agrobacterium, Bradyrhizobium,
Mesorhizobium,
Rhizobium or
Sinorhizobium, the bulk of the strains formed several distinct groups in both methods and did not relate to reference species included in the study. In contrast to exotic species which formed symbiosis with strains of only one specific genomic group, indigenous host species nodulated by metabolically and genomically diverse groups. The results in this study support the view, that long-term association between the symbionts allows gradual differentiation and diversity in compatible rhizobial population resident in native soils. Lack of significant metabolic and genomic relatedness to the reference strains in our results suggested that test strains in our collection probably included ‘unique’ types, which belong to several yet undefined rhizobial species.