Bradyrhizobium japonicum subspecies (USDA 110 and 26) characterized by fixed-nitrogen uptake and symbiotic indoleacetic acid production |
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Authors: | Dr. Tsuneo Kaneshiro James J. Nicholson |
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Affiliation: | (1) U.S. Department of Agriculture, Plant Biochemistry Research, Northern Regional Research Center, Agricultural Research Service, 61604 Peoria, IL, USA |
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Abstract: | Two dissimilar subspecies ofBradyrhizobium japonicum (USDA 110 and 26) differ in ammonia (NH3) assimilation and symbiotic indoleacetic acid (IAA) production. Free-living cultures of type-strain USDA 26 grow on NH3 as a sole N source and take up an NH3 analog, methylamine, whereas USDA strain 110 does neither. Although both strains nodulate soybean effectively, root nodules infected with symbiont 26 contain 0.3–1.1 g IAA per gram fresh weight. Nodules infected by tryptophan catabolic variants 4b and 20d, derived from strain 26, also elicit an increased IAA content, two- to fourfold (2.0–3.9 g · g–1). In contrast, nodules infected with the dissimilar subspecies (strains 110 and 123) contain significantly less IAA. |
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