Nodulation restrictive genotypes of Glycine and Amphicarpaea: a comparative analysis

Several genes that restrict nodulation with specific Bradyrhizobium strains are known in Glycine max (soybean), and a similar system of nodulation restriction has recently been discovered in the related North American legume Amphicarpaea bracteata. We analyzed how nodulation-restrictive genotypes of...

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Bibliographic Details
Published in:Plant and soil 1997-02, Vol.189 (2), p.181-188
Main Authors: Marr, D.L. (State Univ. of New York, Binghamton, NY (USA). Dept. of Biological Sciences), Devine, T.E, Parker, M.A
Format: Article
Language:English
Subjects:
Acetylene reduction
Agronomy. Soil science and plant productions
Alleles
Bacteria
Biological and medical sciences
BRADYRHIZOBIUM
Economic plant physiology
FIJACION DEL NITROGENO
FIXATION DE L'AZOTE
FORMATION DE NODOSITES
Fundamental and applied biological sciences. Psychology
GENE
GENES
Genetic loci
GENOTIPOS
GENOTYPE
GENOTYPES
GLYCINE MAX
Legumes
NITROGEN FIXATION
NODULACION
Nodulation
Nodules
Plants
ROOT NODULATION
Soybeans
Symbiosis
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
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Summary:Several genes that restrict nodulation with specific Bradyrhizobium strains are known in Glycine max (soybean), and a similar system of nodulation restriction has recently been discovered in the related North American legume Amphicarpaea bracteata. We analyzed how nodulation-restrictive genotypes of each plant interacted with Bradyrhizobium strains sampled from the other host species. Ten bacterial isolates from A. bracteata that nodulated differentially with genotypes of their homologous host legume showed uniform responses to two soybean isogenic lines that differed at the Rj4 locus controlling nodulation restriction: all isolates formed nodules of normal size and morphology on both isolines. However, little or no nitrogen fixation occurred in any of these symbioses. A. bracteata genotypes that displayed broad vs. restricted symbiotic phenotypes toward naturally-associated bradyrhizobia were also tested with two bacterial isolates from soybean (USDA 76 and USDA 123). Both isolates formed nodules and fixed nitrogen in association with both A. bracteata genotypes. However, symbiotic effectiveness (as measured by acetylene reduction assays) was normal only for the combination of USDA 76 with the restrictive A. bracteata genotype. Overall, these results indicate that plant genes that restrict nodulation by certain naturally-associated bradyrhizobia do not confer comparable specificity when plants interact with bacteria from another related legume species.
ISSN:0032-079X
1573-5036
DOI:10.1023/A:1004203018770