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Microbial community structure in the rhizosphere of the orphan legume Kersting’s groundnut [Macrotyloma geocarpum (Harms) Marechal & Baudet]

  • Sanjay K. JaiswalEmail author
  • Mustapha Mohammed
  • Felix D. Dakora
Original Article
  • 22 Downloads

Abstract

The presence of microbial communities in the rhizosphere of plants is an important determinant of plant health and soil organic matter composition. Plant species play significant roles in selecting the specific microbial communities that inhabit the root zone. However, till now, there is no solid information regarding the presence of specific plant-microbiome in the rhizosphere of many plants, especially under-exploited and under-researched species such as Kersting’s groundnut. This study assessed the effect of five Kersting’s groundnut landraces on the structure of microbial communities in rhizosphere of field-grown plants. The five tested Kersting’s groundnut landraces (Belane Mottled, Boli, Funsi, Puffeun and Heng Red Mottled) were found to exert a marked selective influence on bacteria associated with their rhizospheres, measured using 16S rDNA MiSeq illumina sequencing. Community differences in microbial composition and relative abundance were both significant. Numerous phyla in the rhizosphere were affected by the test landraces. Except for Belane mottled whose rhizospheres were dominated by Proteobacteria, the rhizosphere soils of the other landraces were dominated by Bacteroidetes. With the exception of landrace Puffeun which showed only Mesorhizobium in its rhizosphere, all the other test landraces revealed the presence of Bradyrhizobium and Rhizobium species of alpha Proteobacteria. Furthermore, the rhizosphere of all landraces were abundant in species of the indole-3-acetic–acid producing Sphingomonas and cellulose-degrading Fibrobacteres. The results of this study suggest that Kersting’s groundnut landraces can shape bacterial community composition in the rhizosphere via plant-related changes in the rhizosphere soil.

Keywords

Phosphate solublizing bacteria IAA producing bacteria Cellulose degrading bacteria Uncultivated bacteria Diversity Legumes 16S rDNA MiSeq illumina sequencing 

Notes

Acknowledgements

This work was supported with grants from the South African Department of Science and Technology, the Tshwane University of Technology, the National Research Foundation in Pretoria, and the South African Research Chair in Agrochemurgy and Plant Symbioses.

Compliance with ethical standards

Conflict of interests

The authors declare that they have no competing interests.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of ChemistryTshwane University of TechnologyPretoriaSouth Africa
  2. 2.Department of Crop SciencesTshwane University of TechnologyPretoriaSouth Africa

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