Diversity of Rhizobia Associated With Lablab purpureus Isolated from Algeria by PCR Amplification of the 16S rDNA PCR / RFLP

Year 2018, Volume: 4 Issue: 2, 26 - 32, 31.07.2018

Amel Benselama Faiza Ouarem Sihem Tellah S. Mohamed Ounane Ghania Ounane

Abstract

The objective of this study was determination of the taxonomic position of these isolates and the evaluation of the level
of approximation or divergence between these strains and the reference strains belonging to different genus of rhizobia.
Amplification of the ribosomal 16S rDNA gene (PCR / RFLP of 16S rDNA) was digested with four different restriction
enzymes: Msp I, Hinf I, Hha I and Taq I. The results of different electrophoretic profiles of fragments obtained shown the
selection of the most discriminating enzymes Msp I and Hinf I. The length polymorphism of the restriction fragments
(RFLP) analysis of PCR amplified 16S rDNA was compared with those of reference strains. Numerical analysis of
molecular characteristics showed that 20 strains studied were divided into three distinct groups; we noted that three
isolates only Lablab purpureus have a high level of similarity with the reference strain "Bradyrhizobium", while 17
isolates did not exhibit precise taxonomic status and therefore their exact phylogenetic classification is to be determined.
The nearly complete sequence of the 16S rRNA gene from a representative strain of each REP-PCR pattern showed that
the strains were closely related to the members of the family Bradyrhizobium.

Keywords

Lablab purpureus, PCR/RFLP, numerical analysis, genetic diversity, repetitive extragenic palindromic (REP)

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