Composition of endophytic bacterial communities of wild legumes as potential biological control agents of crop legumes diseases (Case study: Kermanshah Zagros forest)

Document Type : Research Paper

Authors

1 1- Department of Plant Protection, Faculty of Agricultural Sciences and Food Industries, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Plant Protection, Faculty of Agricultural Sciences and Food Industries, Science and Research Branch, Islamic Azad University, Tehran, Iran

3 Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran

4 Department of Biodiversity, BoomZista Institute, Vancouver, British Columbia, Canada

5 Department of Plant Breeding and Biotechnology, Faculty of Agricultural Sciences and Food Industries, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

Forest ecosystems are the main reservoirs of global biodiversity. Microorganisms play a key role in the biochemical cycles of these ecosystems and are used to protect plants and stimulate their growth. Due to the limitations in the application of classic methods in the isolation and identification of endophytic microorganisms, their potentials and functions have yet to be properly understood. In this study, a culture-independent method was used to study the endophytic bacterial communities of some wild legumes. To this end, the Zagros forests of Kermanshah were surveyed and two varieties of Astragalus ovinus and Vicia lutea were sampled. Total DNAs from different parts of the plant samples were extracted and the bacterial 16S rDNA genes were subsequently amplified. Sequencing analysis using the Illumina MiSeq platform showed the most abundant endophytic bacteria belonged to seven orders of Rhizobiales, Xanthomonadales, Sphingomonadales, Pseudomonadales, Chitinophagales, Enterobacteriales, Betaproteobacteriales. The latter were comprised to three classes of Gammaproteobacteria, Alphaproteobacteria and Bacteroidia, and two phyla of Proteobacteria and Bacteroidetes. Our findings showed that members of Proteobacteria were the dominant bacterial endophytes and accounted for more than 99% and 68% of the total population of endophytic bacteria in V. lutea and A. ovinus, respectively. These bacteria, with the highest percentage of taxonomic units (OTUs), have the highest potential to use as biological control agents of crop legumes diseases. This study provides a clear picture of the population, dominance and diversity of bacterial endophytes of wild legumes in the Zagros forests using metagenomic analysis.

Keywords


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