Abstract
Intensification of sodic soil due to increasing pH is an emerging environmental issue. The present study aimed to isolate and characterise alkaline stress-tolerant and plant growth-promoting bacterial strains from moderately alkaline soil (pH 8–9), strongly alkaline soil (pH 9–10), and very strongly alkaline soil (> 10). Total 68 bacteria were isolated, and screened for multiple plant growth promoting (PGP) attributes. Out of total, 42 isolates demonstrating at least three plant growth promoting PGP traits selected for further assays. Then out of 42, 15 bacterial isolates were selected based on enhanced maize plant growth under greenhouse experiment, and 16S rRNA gene sequencing revealed Bacillus spp. as a dominant genus. Furthermore, based on improved seed germination percentage and biomass of maize (Zea mays L.) under alkaline stress conditions Alcaligenes sp. NBRI NB2.5, Bacillus sp. NBRI YE1.3, and Bacillus sp. NBRI YN4.4 bacterial strains were selected, and evaluated for growth-promotion and alkaline stress amelioration under greenhouse condition. Amongst the selected 3 plant growth promoting rhizobacterial (PGPR) strains, Bacillus sp. NBRI YN4.4 significantly improved the photosynthetic pigments and soluble sugar content, and decreased proline level in inoculated maize plants as compared to uninoculated control under stress conditions. Moreover, significantly enhanced soil enzymes such as dehydrogenase, alkaline phosphatase and betaglucosidase due to inoculation of Bacillus sp. NBRI YN4.4 in maize plants grown in alkaline soil attributes to its role in improving the soil health. Therefore, alkaline stress-tolerant PGPR NBRI YN4.4 can be useful for developing strategies for the reclamation of saline/sodic soils and improving the plant growth and soil health in sustainable manner.
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The authors acknowledge the Director, CSIR National Botanical Research Institute for providing facilities and support during the study. VKD acknowledges CSIR, New Delhi for Senior Research Fellowship.
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The authors acknowledge the financial assistance from the CSIR Network Project MLP022 and In-house Project OLP105.
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PSC, NJ, SKT conceived the idea and designed the experiments; VKD, SM, and SKM carried out the research experiments and analyzed the results. Overall manuscript was written by PSC, VKD, NJ and SKT. All authors read and approved the manuscript.
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Dixit, V.K., Misra, S., Mishra, S.K. et al. Characterization of plant growth-promoting alkalotolerant Alcaligenes and Bacillus strains for mitigating the alkaline stress in Zea mays. Antonie van Leeuwenhoek 113, 889–905 (2020). https://doi.org/10.1007/s10482-020-01399-1
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DOI: https://doi.org/10.1007/s10482-020-01399-1