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Effect of Epichloë gansuensis endophyte and transgenerational effects on the water use efficiency, nutrient and biomass accumulation of Achnatherum inebrians under soil water deficit

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Abstract

Background and aims

This study explored the effects of Epichloë gansuensis endophyte on water use efficiency (WUE), nutrient content and biomass accumulation of Achnatherum inebrians (drunken horse grass, DHG) under varying water availability. It also examined possible transgenerational effects (TGE) on above indicators.

Methods

DHG with (EI) and without endophyte (EF), from seed of plants of the same seed-line that had been grown in Yuzhong (YZ-D, relatively dry) and Xiahe (XH-W, relatively wet), were grown under limited water conditions (LWC). Plant height, leaf number and chlorophyll content were monitored dynamically. After 10 weeks, the biomass, photosynthetic indexes and C, N, P content of plants was determined.

Results

The endophyte increased plant height and chlorophyll content, but decreased plant leaf number, and the CO2 concentration, while increasing other photosynthetic indexes. The biomass, N and P content were higher in EI than EF plants of the YZ-D DHG, but not the C content and root weight. However, there were almost no significant affects on these factors between EI and EF plants of the XH-W DHG.

Conclusions

The endophyte enhanced WUE and maintained the growth of plants under LWC by improving photosynthetic efficiency and promoting nutrient absorption. However, TGE also affected this process.

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Acknowledgements

We wish to thank Professor Hong Zhang of Texas Tech University for providing related literatures, Dr. Wei Tang and Dr. Rui Li for sharing their meteorological data, Dr. Hui Song of Shandong Academy of Agricultural Science, Jinan, China for his benefit suggestions and the anonymous reviewers for reviewing the manuscript. This research was financially supported by the National Basic Research Program of China (2014CB138702), the National Nature Science Foundation of China (31402132 and 31772665), and the Fundamental Research Funds for the Central Universities (lzujbky-2016-12; lzujbky-2016-177).

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  1. State key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou, 730020, People’s Republic of China

    Chao Xia, Xingxu Zhang & Zhibiao Nan

  2. Grasslands Research Centre, Private Bag 11-008, Palmerston North, 4442, New Zealand

    Michael J. Christensen

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  1. Chao Xia
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Correspondence to Xingxu Zhang or Zhibiao Nan.

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Responsible Editor: Birgit Mitter

Michael J. Christensen retired from AgResearch.

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Xia, C., Christensen, M.J., Zhang, X. et al. Effect of Epichloë gansuensis endophyte and transgenerational effects on the water use efficiency, nutrient and biomass accumulation of Achnatherum inebrians under soil water deficit. Plant Soil 424, 555–571 (2018). https://doi.org/10.1007/s11104-018-3561-5

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