Genetic Diversity of Native Bradyrhizobia Isolated from Soybeans ( Glycine max L.) in Different Agricultural-Ecological-Climatic Regions of India

Author:

Appunu Chinnaswamy123,N′Zoue Angèle45678,Laguerre Gisèle23456

Affiliation:

1. Microbial Genetics Laboratory, Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221 005, India

2. INRA, UMR 1229 Microbiologie et Géochimie des Sols, F-21065 Dijon, France

3. Université de Bourgogne, UMR 1229, F-21065 Dijon, France

4. IRD, UMR 113 Symbioses Tropicales et Méditerranéennes, F-34398 Montpellier, France

5. INRA, UMR 113, F-34398 Montpellier, France

6. CIRAD, UMR 113, F-34398 Montpellier, France

7. SupAgro, UMR 113, F-34398 Montpellier, France

8. Université de Montpellier II, UMR 113, F-34398 Montpellier, France

Abstract

ABSTRACT Fifty isolates from root nodules of soybean plants sampled in five agricultural-ecological-climatic regions of India were analyzed by PCR-restriction fragment length polymorphism analysis of the 16S rRNA gene, the intergenic spacer region between the 16S and 23S rRNA genes (IGS), and the nifH and nodC genes. Eight haplotypes assigned to the Bradyrhizobium genus were identified, and the genetic diversity was conserved across regions. Sequence analyses of the IGS and the dnaK, glnII, recA , and nifH genes revealed three groups. One of them (26% of isolates) was assigned to Bradyrhizobium liaoningense . A second group (36% of isolates) was identified as B. yuanmingense but likely forms a new biovar able to nodulate soybean plants. The third lineage (38% of isolates) was different from all described Bradyrhizobium species but showed the same symbiotic genotype as B. liaoningense and B. japonicum bv. glycinearum .

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

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