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World Journal of Microbiology and Biotechnology

, Volume 30, Issue 2, pp 719–725 | Cite as

Molecular characterization and identification of plant growth promoting endophytic bacteria isolated from the root nodules of pea (Pisum sativum L.)

  • Mohsin TariqEmail author
  • Sohail Hameed
  • Tahira Yasmeen
  • Mehwish Zahid
  • Marriam Zafar
Original Paper

Abstract

Root nodule accommodates various non-nodulating bacteria at varying densities. Present study was planned to identify and characterize the non-nodulating bacteria from the pea plant. Ten fast growing bacteria were isolated from the root nodules of cultivated pea plants. These bacterial isolates were unable to nodulate pea plants in nodulation assay, which indicate the non-rhizobial nature of these bacteria. Bacterial isolates were tested in vitro for plant growth promoting properties including indole acetic acid (IAA) production, nitrogen fixation, phosphate solubilization, root colonization and biofilm formation. Six isolates were able to produce IAA at varying level from 0.86 to 16.16 μg ml−1, with the isolate MSP9 being most efficient. Only two isolates, MSP2 and MSP10, were able to fix nitrogen. All isolates were able to solubilize inorganic phosphorus ranging from 5.57 to 11.73 μg ml−1, except MSP4. Bacterial isolates showed considerably better potential for colonization on pea roots. Isolates MSP9 and MSP10 were most efficient in biofilm formation on polyvinyl chloride, which indicated their potential to withstand various biotic and abiotic stresses, whereas the remaining isolates showed a very poor biofilm formation ability. The most efficient plant growth promoting agents, MSP9 and MSP10, were phylogenetically identified by 16S rRNA gene sequence analysis as Ochrobactrum and Enterobacter, respectively, with 99 % similarity. It is suggested the potential endophytic bacterial strains, Ochrobactrum sp. MSP9 and Enterobacter sp. MSP10, can be used as biofertilizers for various legume and non-legume crops after studying their interaction with the host crop and field evaluation.

Keywords

Pisum sativum L. Plant growth promoting bacteria 16S rRNA sequencing Nodules 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Mohsin Tariq
    • 1
    • 2
    Email author
  • Sohail Hameed
    • 1
  • Tahira Yasmeen
    • 1
    • 2
  • Mehwish Zahid
    • 1
  • Marriam Zafar
    • 1
    • 3
  1. 1.Microbial Physiology LaboratoryNational Institute for Biotechnology and Genetic Engineering (NIBGE)/ PAECIslamabadPakistan
  2. 2.Government College University Faisalabad (GCUF)FaisalabadPakistan
  3. 3.Centre of Agricultural Biochemistry and Biotechnology (CABB)University of Agriculture FaisalabadFaisalabadPakistan

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