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Alleviation of the detrimental effect of water deficit on wheat (Triticum aestivum L.) growth by an indole acetic acid-producing endophytic fungus

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Abstract

Background and aims

Endophytic fungi colonization is an eco-friendly strategy to respond to environmental stresses and confer tolerance to the host plant. Here, the responses of wheat plant inoculated with an indole acetic acid (IAA) -producing endophytic fungus to drought stress and water recovery were evaluated.

Methods

The inoculation of wheat plants with Alternaria alternata (LQ1230) was conducted to evaluate drought resistance under adequate water, water deficit and water recovery conditions by examining the growth parameters and various physiological indicators of wheat seedlings.

Results

The LQ1230 isolated from Elymus dahuricus Turcz could secrete indole acetic acid (IAA) by both the tryptophan-dependent (319.24 ± 14.88 μg/mL) and independent (40.12 ± 8.59 μg/mL) pathways. LQ1230 inoculation enhanced wheat growth and drought tolerance through regulation of antioxidant enzyme activities and the content of compatible solutes such as soluble sugars and proline. Additionally, LQ1230 inoculated plants demonstrated significantly improved photosynthesis, C and N accumulation of wheat plants, leading to a positive relationship with plant dry biomass under water deficit and re-watering conditions.

Conclusions

We found that the improved wheat plant growth, photosynthesis and nutrient accumulations by the inoculation of Alternaria alternata LQ1230 might be attributed to the reprogramming of wheat plant metabolism, thus enhancing wheat drought tolerance. Inoculation with fungal endophytes such as LQ1230 has the potential to increase crop drought resistance.

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Acknowledgements

The authors would like to acknowledge the Institute of Grassland Research of CAAS for providing the Elymus dahuricus Turcz seeds and Xuan Xu for helpful comments and revision of the manuscript. This study was financially supported by the Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences.

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  1. Institute of Environment and Sustainable Development in Agricultural, Chinese Academy of Agricultural Sciences, Beijing, China

    Xiaojing Qiang, Junjun Ding, Wei Lin, Qiaozhen Li, Chunying Xu, Qian Zheng & Yuzhong Li

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  1. Xiaojing Qiang
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  2. Junjun Ding
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  3. Wei Lin
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  4. Qiaozhen Li
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Correspondence to Yuzhong Li.

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Qiang, X., Ding, J., Lin, W. et al. Alleviation of the detrimental effect of water deficit on wheat (Triticum aestivum L.) growth by an indole acetic acid-producing endophytic fungus. Plant Soil 439, 373–391 (2019). https://doi.org/10.1007/s11104-019-04028-7

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