Browsing by Author "Borthakur, D."

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    Genomic Arrangement of Nod Gene Sequences of Bradyrhizobium Isolates from TGx Soybean Genotypes in Relation to Bradyrhizobium USDA110
    (Current Plant Science and Biotechnology in Agriculture, 2000) Abaidoo, R. C.; Keyser, H. H.; Singleton, P. W.; Borthakur, D.
    Soybean nodulates with specific rhizobia and usually requires inoculation with Bradyrhizobium japonicum strains. Several varieties (e.g., Malayan and Orba) introduced to Africa (Pulver et al., 1982;) were however adequately nodulated in soils that had no previous inoculation with B. japonicum while cultivars from North America were poorly nodulated. The freely nodulating soybean genotypes, termed promiscuous, however, had poor agronomic characteristics. The International Institute of Tropical Agriculture (IITA) selected soybean genotypes that combined the free nodulating traits of the promiscuous genotypes and the improved agronomic characteristics of the North American genotypes. The resultant TGx genotypes, widely cultivated in western and eastern Africa have poor yields due to ineffective nodulation (Okereke and Eaglesham, 1992). This observation led to the suggestion that the TGx soybean genotypes would benefit from B. japonicum inoculation. It is therefore important that the genetic relatedness of the indigenous rhizobia nodulating these soybean genotypes to recommended inoculum strains (e.g., B. japonicum USDA 110) needs to be elucidated. A total of 258 Bradyrhizobium