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English

Bradyrhizobium ivorense sp. nov. as a potential local bioinoculant for Cajanus cajan cultures in Côte d'Ivoire

Contributors

Fossou, Romain; Pothier, Joël F.; Zézé, Adolphe; Perret, Xavier

Published in

International journal of systematic and evolutionary microbiology, vol. 70, no. 2, p. 1421-1430

Publication date

2020

Abstract

For many smallholder farmers of Sub-Saharan Africa, pigeonpea (Cajanus cajan) is an important crop to make ends meet. To ascertain the taxonomic status of pigeonpea isolates of Côte d'Ivoire previously identified as bradyrhizobia, a polyphasic approach was applied to strains CI-1BT, CI-14A, CI-19D and CI-41S. Phylogeny of 16S ribosomal RNA (rRNA) genes placed these nodule isolates in a separate lineage from current species of the B. elkanii super clade. In phylogenetic analyses of single and concatenated partial dnaK, glnII, gyrB, recA and rpoB sequences, the C. cajan isolates again formed a separate lineage, with strain CI-1BT sharing the highest sequence similarity (95.2%) with B. tropiciagri SEMIA 6148T. Comparative genomic analyses corroborated the novel species status, with 86% ANIb and 89% ANIm as the highest average nucleotide identity (ANI) values with B. elkanii USDA 76T. Although CI-1BT, CI-14A, CI-19D and CI-41S shared similar phenotypic and metabolic properties, growth of CI-41S was slower in/on various media. Symbiotic efficacy varied significantly between isolates, with CI-1BT and CI-41S scoring on the C. cajan ‘Light-Brown' landrace as the most and least proficient bacteria, respectively. Also proficient on Vigna radiata (mung bean), Vigna unguiculata (cowpea, niébé) and additional C. cajan cultivars, CI-1BT represents a potential bioinoculant adapted to local soil conditions and capable of fostering the growth of diverse legume crops in Côte d'Ivoire. Given the data presented here, we propose the 19 C. cajan isolates to belong to a novel species called Bradyrhizobium ivorense sp. nov., with CI-1BT (=CCOS 1862T=CCMM B1296T) as a type strain.

Keywords

  • Africa
  • Symbiosis
  • Nitrogen fixation
  • Legumes
  • Pigeonpea
  • Root nodules

UNIGE affiliation entities

Funding

Citation (ISO format)

FOSSOU, Romain et al. Bradyrhizobium ivorense sp. nov. as a potential local bioinoculant for Cajanus cajan cultures in Côte d’Ivoire. In: International journal of systematic and evolutionary microbiology, 2020, vol. 70, n° 2, p. 1421–1430. doi: 10.1099/ijsem.0.003931

Main files (1)

Article (Published version)
CC BY-NC

Identifiers

Additional URL for this publication

https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.003931

Journal ISSN

1466-5026
597views
482downloads

Technical informations

Creation

13/07/2020 18:13:00

First validation

13/07/2020 18:13:00

Update

25/07/2024 15:55:49

Status update

25/07/2024 15:55:49

Last indexation

31/10/2024 19:17:00
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