Genetic and symbiotic characterization of rhizobia isolated from tree and herbaceous legumes grown in soils from ecologically diverse sites in Kenya
2000
Odee, D. W. | Haukka, K. | Mcinroy, S. G. | Sutherland, J. M. | Young, J. P. W. | Sprent, J. I
The article is about the study of the natural genetic diversity and symbiotic status among 41 root nodule bacteria from ecologically diverse sites in Kenya having no history of growing domesticated legumes, but where species of Acacia and sesbania sesban grow naturally. Isolates originated either from nodules of field plants (trees and shrubs) or from trap host plants grown in field-collected soil. The host plant were Acacia mellifera, Acacia nilotica, Acacia nubica, Acacia seyal, Acacia xanthophloea, and Faidherbia albida Twenty Keyan and eight reference strains were tested on tree species that are priority in Kenya. These showed considerable diversity in symbiotic characters. Whereas Acacia species and F.albida showed variation in symbiotic effectiveness with test strains, S.sesban nodulated most effectively only with its homologus and strains. Agrobacterium- allied strains failed to nodulate any of the host species tested. The high diversity (rhizobiial genotypes, host affinities and their symbiotic effectiveness0 found in the Kenya sites will require rigorous selection for host X strain X site combination in order to obtain effective and competitive inoculants for legume tree and crops in rehabilitation and agroforestry programmes.
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