Exclusion of inefficient Bradyrhizobium japonicum serogroups by soybean genotypes

Soybean [Glycine max (L.) Merr.] forms a symbiosis with serogroups of Bradyrhizobium japonicum that differ in their dinitrogen fixing abilities. The objectives of this study were to identify soybean genotypes that would restrict nodulation by relatively inefficient serogroups indigenous to a large p...

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Bibliographic Details
Published in:Plant and soil 1990, Vol.121 (1), p.99-105
Main Authors: Weiser, G.C. (Edisto Research and Education Center, Blackville, SC (USA)), Skipper, H.D, Wollum, A.G. II
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Bradyrhizobium
Bradyrhizobium japonicum
Economic plant physiology
FORMATION DE NODOSITES
Fundamental and applied biological sciences. Psychology
GENOTIPOS
GENOTYPE
GENOTYPES
GLYCINE MAX
Inoculation
NODULACION
Nodulation
Nodules
Plants
RHIZOBIUM
ROOT NODULATION
Root nodules
Soybeans
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
Tap roots
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Summary:Soybean [Glycine max (L.) Merr.] forms a symbiosis with serogroups of Bradyrhizobium japonicum that differ in their dinitrogen fixing abilities. The objectives of this study were to identify soybean genotypes that would restrict nodulation by relatively inefficient serogroups indigenous to a large portion of the southeastern USA, and then characterize the nodulation responses of selected genotypes with specific bradyrhizobial strains under controlled conditions. From field screening trials followed by controlled single and competitive inoculations of serogroups USDA 31, 76 and 110, twelve soybean genotypes out of 382 tested were identified with varying levels of exclusion abilities. Soybean nodule occupancies and nodulation characteristics were influenced by plant genotype, environment (i.e. field or greenhouse), bradyrhizobial serogroup, and location of nodules (i.e. tap or lateral root). The cultivar Centennial sustains high seed yields even though it nodulates to a high degree with the inefficient serogro/up USDA 31. In contrast, data from the released cultivars Braxton, Centennial and Coker 368 indicate that they may have been selected to exclude the inefficient serogroup USDA 76 from their tap root nodules, possibly contributing to high seed yield.
ISSN:0032-079X
1573-5036
DOI:10.1007/bf00013102