Arbuscular mycorrhiza and plant chromium tolerance

Abstract

Arbuscular mycorrhizal (AM) fungi are ubiquitous soil fungi that readily form symbiotic associations with most terrestrial plants. The growth and functions of AM fungi depend on carbohydrates supplied by the plants, in return, they assist the plants acquire mineral nutrients (e.g., phosphorus) from soil. The AM symbiosis also improves plant survival in various environments of unfavorable growth conditions, such as metal (loid) contaminated soil. It has been well demonstrated that AM symbiosis improved plant adaptation to Cr contaminated soil, which would have a great potential in phytoremediation and ecological restoration of Cr contaminated soils. By using Cr as an example case, we have reviewed the role of AM fungi in alleviation of Cr phytotoxicity and associated factors influencing AM plant Cr tolerance. AM symbiosis improves plant Cr tolerance through its direct roles in Cr stabilization and transformation and indirect roles via AM symbiosis mediated nutrient acquisition and physiological regulation. Future research perspectives on physiological and molecular mechanisms underlying Cr behavior and detoxification in AM symbiosis, as well as potential usage of AM fungi in ecological restoration and agriculture production in Cr contaminated soils were also proposed.

Keywords

Arbuscular mycorrhizal fungi / Heavy metal / Chromium / Tolerance / Translocation and transformation / Bioremediation

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Acknowledgments

This study was supported by National Key Research and Development Program of China (2016YFD0800400) and the National Natural Science Foundation of China (21677164).

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2019 Higher Education Press