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Plant Growth-Promoting Rhizobacteria Enhance Abiotic Stress Tolerance in Solanum tuberosum Through Inducing Changes in the Expression of ROS-Scavenging Enzymes and Improved Photosynthetic Performance

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Abstract

In this report we address the changes in the expression of the genes involved in ROS scavenging and ethylene biosynthesis induced by the inoculation of plant growth-promoting rhizobacteria (PGPR) isolated from potato rhizosphere. The two Bacillus isolates used in this investigation had earlier demonstrated a striking influence on potato tuberization. These isolates showed enhanced 1-aminocyclopropane-1-carboxylic acid deaminase activity, phosphate solubilization, and siderophore production. Potato plants inoculated with these PGPR isolates were subjected to salt, drought, and heavy-metal stresses. The enhanced mRNA expression levels of the various ROS-scavenging enzymes and higher proline content in tubers induced by PGPR-treated plants contributed to increased plant tolerance to these abiotic stresses. Furthermore, the photosynthetic performance indices of PGPR-inoculated plants clearly exhibited a positive influence of these bacterial strains on the PSII photochemistry of the plants. Overall, these results suggest that the PGPR isolates used in this study are able to confer abiotic stress tolerance in potato plants.

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Acknowledgments

This research project was supported by the Konkuk University research support program. The authors are thankful to Prof. Reto J. Strasser, Bioenergetics Laboratory, University of Geneva, Switzerland, for providing the Plant Efficiency Analyzer used in this study.

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The authors have no conflicts of interest to disclose.

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Authors and Affiliations

  1. Department of Molecular Biotechnology, School of Life & Environmental Sciences, Konkuk University, Seoul, 143-701, Korea

    Mayank Anand Gururani, Venkidasamy Baskar, Jelli Venkatesh & Se Won Park

  2. Department of Botany, Guru Ghasidas Central University, Bilaspur, CG, India

    Chandrama Prakash Upadhyaya

  3. Department of Bioenergy Science and Technology, Chonnam National University, 333 Yongbongro, Buk-gu, Gwangju, 500-757, Korea

    Akula Nookaraju

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  1. Mayank Anand Gururani
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Correspondence to Se Won Park.

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Gururani, M.A., Upadhyaya, C.P., Baskar, V. et al. Plant Growth-Promoting Rhizobacteria Enhance Abiotic Stress Tolerance in Solanum tuberosum Through Inducing Changes in the Expression of ROS-Scavenging Enzymes and Improved Photosynthetic Performance. J Plant Growth Regul 32, 245–258 (2013). https://doi.org/10.1007/s00344-012-9292-6

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