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Culturable microbial diversity in the rhizosphere of different biotypes under variable salinity

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Abstract

The microbial diversity in the rhizosphere of different biotypes is influenced by different factors like plant species, root exudates and soil environment. Culturable microbial diversity in the rhizosphere of six biotypes (Chenopodium murale (CM), Spergula arvensis (SA), Launaea nudicaulis (LN), Brassica juncea (BJ), Phalaris minor (PM) and Triticum aestivum (TA)) growing in variable saline environment (ECe < 8.0 and > 8.0 dS m−1) was assessed and compared with the diversity of bulk soils (BS) of same environments. The significantly (P < 0.0001) highest bacterial and actinomycetes population were found in the rhizosphere of BJ whereas SA possessed higher fungal population. Phosphorus and zinc solubilizing bacteria was also found highest in BJ and TA rhizosphere, respectively. High saline soils had greater endospore forming bacterial population. The TA (0.88) and LN (0.87) rhizospheres showed significantly greater Shannon–Weiner diversity index compared to bulk soils (0.45–0.61). Pielou’s index of evenness of different samples ranged from 0.13 to 0.43. Discriminant function analysis revealed that rhizospheres of SA, CM and TA were clearly distinct. The rhizospheric soil of PM and BJ were similar to each other but clearly distinct from others. The observed separation of different biotypes was regulated by dimorphic fungi, nitrogen fixing bacteria, Pseudomonas, and fungi. Thus, our study clearly suggests that culturable microbial populations are influenced by different biotypes and salinity levels.

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Acknowledgements

Authors are thankful to the Director, ICAR-Central Soil Salinity Research Institute, Karnal, India for providing necessary facilities to carry out the research work (107/2020).

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Authors and Affiliations

  1. ICAR-Central Soil Salinity Research Institute, Karnal, Haryana, 132001, India

    Priyanka Chandra, Pooja Dhuli, Pooja Verma, Awtar Singh, Madhu Choudhary, Kailash Prajapat, A. K. Rai & R. K. Yadav

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  1. Priyanka Chandra
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  2. Pooja Dhuli
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  3. Pooja Verma
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  4. Awtar Singh
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  5. Madhu Choudhary
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  6. Kailash Prajapat
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  7. A. K. Rai
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  8. R. K. Yadav
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Correspondence to Awtar Singh or Madhu Choudhary.

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Chandra, P., Dhuli, P., Verma, P. et al. Culturable microbial diversity in the rhizosphere of different biotypes under variable salinity. Trop Ecol 61, 291–300 (2020). https://doi.org/10.1007/s42965-020-00089-3

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  • DOI: https://doi.org/10.1007/s42965-020-00089-3

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