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Co-existence of Leclercia adecarboxylata (LSE-1) and Bradyrhizobium sp. (LSBR-3) in nodule niche for multifaceted effects and profitability in soybean production

  • K. C. KumawatEmail author
  • Poonam Sharma
  • Inderjeet Singh
  • Asmita Sirari
  • B. S. Gill
Original Paper
  • 41 Downloads

Abstract

The present study was designed with the objective of improving growth and nodulation of soybean [Glycine max (L.) Merill] with co-inoculation of native Bradyrhizobium sp. (LSBR-3) (KF906140) and non-rhizobial nodule endophytic diazotroph Leclercia adecarboxylata (LSE-1) (KX925974) with multifunctional plant growth promoting (PGP) traits in cereal based cropping system (Rice–Wheat). A total of 40 endophytic bacteria from cultivated and wild sp. of soybean were screened for multifarious PGP traits and pathogenicity test. Based on PGP traits, antagonistic activities and bio-safety test; L. adecarboxylata (LSE-1) was identified with 16 S rRNA gene sequencing along with the presence of nifH (nitrogen fixation) and ipdc (IAA production) genes. Dual inoculant LSE-1 and LSBR-3 increased indole acetic acid (IAA), P & Zn-solubilization, 1-aminocyclopropane-1-carboxylate deaminase (ACCD) activity, siderophore, biofilm formation and exo-polysaccharides in contrast to single inoculation treatment. Further, assessment of dual inoculant LSBR-3 + LSE-1 improved growth parameters, nodulation, soil enzymes activities, nutrient accumulation and yield as compared to single as well as un-inoculated control treatment under field conditions. Single inoculant LSBR-3 improved yield by 8.84% over control. Further, enhancement of 4.15% grain yield was noticed with LSBR-3 + LSE-1 over LSBR-3 alone treatment. Application of LSBR-3 + LSE-1 gave superior B:C ratio (1.29) and additional income approximately 116 USD ha−1 in contrast to control treatment. The present results thus, is the first report of novel endophytic diazotroph L. adecarboxylata (LSE-1) as PGPR from Indian conditions particularly in Punjab region for exploiting as potential PGPR along with Bradyrhizobium sp. (LSBR-3) in soybean.

Keywords

Bradyrhizobium sp. Leclercia adecarboxylata Nutrient uptake P Solubilization Soil enzymes 

Notes

Acknowledgements

The first author is highly thankful to Indian Council of Agricultural Research (ICAR), New Delhi for providing Junior Research Fellowship (ICAR-JRF) for conducting M.Sc. research project.

Compliance with ethical standards

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Supplementary material

11274_2019_2752_MOESM1_ESM.docx (19 kb)
Supplementary file1 (DOCX 18 kb)

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of MicrobiologyPunjab Agricultural UniversityLudhianaIndia
  2. 2.Department of Plant Breeding and GeneticsPunjab Agricultural UniversityLudhianaIndia

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