Genetic Diversity and Symbiotic Effectiveness of Rhizobia Isolated from Root Nodules of Medicago sativa L.

Document Type : Research Paper

Authors

1 Former PhD student of Tehran University and Assistant professor of University of Mohaghegh Ardabili

2 Associate professor, Tehran University

3 Assistant professor, Agricultural Biotechnology Research Institute of Iran

4 Assistant professor, Soil and Water Research Institute of Iran

5 Assistant professor, Tehran University

Abstract

The symbiotic nitrogen fixation resulting from the rhizobia–legume interaction can act as a sustainable source of nitrogen in many agricultural systems. Better N2 fixation can be achieved by selecting superior rhizobia from native populations. Genetic characterization and biodiversity of the native rhizobia population can be useful for the selection of inoculant strains. In this study, the plant infection, symbiotic effectiveness, and genetic diversity of 48 rhizobia isolated from root nodules of Medicago sativa L., cultivated in different sites of Hamedan Province, was studied by restriction fragment length polymorphism (RFLP) analysis of PCR-amplified intergenic spacer (ITS). Analysis of the 16S-23S (ITS) fragment showed considerable diversity within these microsybionts. At the similarity of 70%, these rhizobia were clustered into 6 groups: I, II, III and IV. Plant infection test results showed that most strains formed nodules on the roots of host plant. No nodules were observed on the roots of plants inoculated with KH16, KH24, KH6, KH10, KH133, and KH193. According to the results of symbiotic effectiveness test, strains were divided into four groups: non effective, relatively effective, effective, and highly effective strains.

Keywords


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