Combination of Siderophore-Producing Bacteria and Piriformospora indica Provides an Efficient Approach to Improve Cadmiu
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PLANT MICROBE INTERACTIONS
Combination of Siderophore-Producing Bacteria and Piriformospora indica Provides an Efficient Approach to Improve Cadmium Tolerance in Alfalfa Mozhgan Sepehri 1 & Behnam Khatabi 2 Received: 22 June 2020 / Accepted: 19 October 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Application of siderophore-producing microorganisms (SPMs), as an environmentally friendly approach, facilitates plant growth and survival under heavy metals toxicity. This study evaluated the effectiveness of SPMs, belonging to the bacterial genera Rhizobium and Pseudomonas and a root endophytic fungus (Piriformospora indica) to improve the fitness of alfalfa under cadmium (Cd) stress. A greenhouse experiment was performed as a randomized design with factorial arrangement of treatments. Treatments included microbial inoculations (Sinorhizobium meliloti, Pseudomonas fluorescence, and P. indica) and different Cd concentrations (0, 2, 5, 10 mg/kg) with three replications in potting media containing sand and sterile perlite (v/v, 2:1). The effect of Cd on plant growth and development, antioxidant enzymes activities, and accumulation of Cd and nutrients in alfalfa plant was investigated. Alfalfa inoculated with SPMs showed significantly higher biomass and nutrients uptake under both normal and Cd stress conditions than the controls. Under the highest Cd concentration (10 mg/kg), alfalfa plants inoculated with P. fluorescens and P. indica, either alone or in combination, showed the highest shoot dry weights. Cd-induced oxidative stress was mitigated by SPMs through enhanced antioxidant enzyme activities of catalase, ascorbate peroxidase, and guaiacol peroxidase. We showed that P. indica either alone or in combination with the siderophore producing bacteria (SPB) minimized the toxicity of Cd by enhanced growth rate and the lower Cd concentration in the shoots. In conclusion, metal-resistant SPMs could assist alfalfa to survive in Cd-contaminated soil by enhancing plant growth and development. Application of plant-associated microbes is an efficient, environmentally friendly approach to surmount the adverse effects of heavy metals toxicity on plants, animals, and humans.
Keywords Plant growth-promoting microorganisms . Antioxidant activity . Plant stress responses . Host adaptation Abbreviations APX Ascorbate peroxidase CAT Catalase CFU Colony forming units CM Complex medium DTT Dithiothreitol EDTA Ethylenediaminetetraacetic acid GPX Glutathione peroxidase HM Heavy metal * Behnam Khatabi [email protected] 1
Department of Soil Science, School of Agriculture, Shiraz University, Shiraz, Iran
2
Department of Agriculture, Food and Resource Sciences, University of Maryland Eastern Shore, Princess Anne, MD, USA
PGPB PGPF PGPMs PVP PBS SNF SPB SPMs
Plant growth promoting bacteria Plant growth promoting fungi Plant growth promoting microorganisms Polyvinylpyrrolidone Phosphate buffered saline Symbiotic nitrogen fixation Siderophore-producing bacteria Siderophore-producing microorganisms
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