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A meta-analysis of arbuscular mycorrhizal effects on plants grown under salt stress

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Abstract

Salt stress limits crop yield and sustainable agriculture in most arid and semiarid regions of the world. Arbuscular mycorrhizal fungi (AMF) are considered bio-ameliorators of soil salinity tolerance in plants. In evaluating AMF as significant predictors of mycorrhizal ecology, precise quantifiable changes in plant biomass and nutrient uptake under salt stress are crucial factors. Therefore, the objective of the present study was to analyze the magnitude of the effects of AMF inoculation on growth and nutrient uptake of plants under salt stress through meta-analyses. For this, data were compared in the context of mycorrhizal host plant species, plant family and functional group, herbaceous vs. woody plants, annual vs. perennial plants, and the level of salinity across 43 studies. Results indicate that, under saline conditions, AMF inoculation significantly increased total, shoot, and root biomass as well as phosphorous (P), nitrogen (N), and potassium (K) uptake. Activities of the antioxidant enzymes superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase also increased significantly in mycorrhizal compared to nonmycorrhizal plants growing under salt stress. In addition, sodium (Na) uptake decreased significantly in mycorrhizal plants, while changes in proline accumulation were not significant. Across most subsets of the data analysis, identities of AMF (Glomus fasciculatum) and host plants (Acacia nilotica, herbs, woody and perennial) were found to be essential in understanding plant responses to salinity stress. For the analyzed dataset, it is concluded that under salt stress, mycorrhizal plants have extensive root traits and mycorrhizal morphological traits which help the uptake of more P and K, together with the enhanced production of antioxidant enzymes resulting in salt stress alleviation and increased plant biomass.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MEST) (No. 2012R1A2A1A01005294).

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  1. Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Chungbuk, 361-763, Republic of Korea

    Murugesan Chandrasekaran, Sonia Boughattas & Tongmin Sa

  2. Department of Plant Pathology, North Carolina State University, Raleigh, NC, 27695, USA

    Shuijin Hu

  3. Department of Animal Sciences, North Carolina Agricultural and Technical State University, Greensboro, NC, 27411, USA

    Sang-Hyon Oh

  4. Parasitology Laboratory, Institute Pasteur Tunis, Tunis, Tunisia

    Sonia Boughattas

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  1. Murugesan Chandrasekaran
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Chandrasekaran, M., Boughattas, S., Hu, S. et al. A meta-analysis of arbuscular mycorrhizal effects on plants grown under salt stress. Mycorrhiza 24, 611–625 (2014). https://doi.org/10.1007/s00572-014-0582-7

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