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Improved drought tolerance in Festuca ovina L. using plant growth promoting bacteria

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Abstract

Numerous ecological factors influence a plant’s ability to live and grow, in which dryness is a substantial constraint on plant growth in arid and semi-arid areas. In response to a specific environmental stress, plants can use the most effective bacteria to support and facilitate their growth and development. Today, plant growth promoting rhizobacteria (PGPR) is widely used to reduce drought stress on plant growth. In this study, the effects of drought on Festuca ovina L. germination, growth, and nutrient absorption were investigated using PGPR in a factorial test with a completely random design under four water regimes. Soil water content was kept at 100% FC (field capacity), 70% FC (FC), 50% FC, and 30% FC. The treatments were inoculated with Azotobacter vinelandii, Pantoea agglomerans+Pseudomonas putida, and a mixture of bio-fertilizers. Results showed that the effects of drought stress were significantly reduced (P<0.05) when A. vinelandii and P. agglomerans+P. putida were used separately, however, the combined treatment of bio-fertilizers had a greater influence on seed germination than the single application. P. agglomerans+P. putida under 30% FC condition resulted in higher increases in stem, root length, and plant dry biomass. The highest uptake of nutrients was observed for the combined treatment of bio-fertilizers under 30% FC condition. Therefore, the use of A. vinelandii and P. agglomerans+P. putida, applied separately or combined, increased tolerance to drought stress in F. ovina by increased germination indices, dry weight, stem length, and root length. Because of the beneficial effects of PGPR on the growth characteristics of plants under drought conditions and the reduction of negative effects of drought stress, inoculating F. ovina seeds with Azotobacter and Pseudomonas is recommended to improve their growth and development characteristics under drought conditions. PGPR, as an affordable and environmentally friendly method, can improve the production of forage in water-stress rangelands.

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Acknowledgements

The authors are grateful to the Research Affairs of the University of Zabol, Iran for the financial support (IR-UOZ-GR-8721).

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  1. Department of Range and Watershed Management, Faculty of Water and Soil, University of Zabol, Zabol, 9861335856, Iran

    Fateme Rigi, Morteza Saberi & Mahdieh Ebrahimi

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Rigi, F., Saberi, M. & Ebrahimi, M. Improved drought tolerance in Festuca ovina L. using plant growth promoting bacteria. J. Arid Land 15, 740–755 (2023). https://doi.org/10.1007/s40333-023-0015-6

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