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Endophytic infection modifies organic acid and mineral element accumulation by rice under Na2CO3 stress

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Abstract

Background and aims

Saline and alkali soils severely impact plant growth. Endophyte and plant associations are known to significantly modify plant metabolism. This study reports the effects of a type of endophyte on organic acid (OA) accumulation and ionic balance in rice under Na2CO3 stress.

Methods

Rice seedlings with (E+) and without (E-) endophytic infection were subjected to different levels of Na2CO3 stress (0, 5, 10, 15, and 20 mM) for two weeks. Organic acids and mineral elements in the leaves and roots were determined.

Results

Seedlings with endophytic infection accumulated mainly citrate and fumarate, with some malate and succinate in the leaves. In the roots, accumulation of malate and fumarate was enhanced significantly by endophytic infection, while less citrate and succinate was accumulated under Na2CO3 stress, which suggested that leaves and roots use different mechanisms to control OA metabolism. Endophytes reduced the total Na and Na:K ratios, but increased ST values, the percent changes of other measured nutrients, Chl content, and dry weight per plant under Na2CO3 stress.

Conclusions

Endophytic infection plays a key role in maintaining plant growth by improving nutrient uptake and adjusting OA accumulation under Na2CO3 stress. The application of endophytes can enhance the resistance of rice to salinity.

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Acknowledgements

This research was supported by the National Science Foundation of China (31470398, 31600314, and 31270369), the Program for Liaoning Excellent Talents in University (LR2015061) and Shenyang City Science and Technology Plan (F16-205-1-50).

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Authors and Affiliations

  1. College of Life Science, Shenyang Normal University, Shenyang, 110034, People’s Republic of China

    Xuemei Li, Lianju Ma, Ning Bu & Yueying Li

  2. School of Environmental Science, Liaoning University, Shenyang, 110036, People’s Republic of China

    Lihong Zhang

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  1. Xuemei Li
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  2. Lianju Ma
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  3. Ning Bu
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  4. Yueying Li
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Correspondence to Xuemei Li or Lihong Zhang.

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Li, X., Ma, L., Bu, N. et al. Endophytic infection modifies organic acid and mineral element accumulation by rice under Na2CO3 stress. Plant Soil 420, 93–103 (2017). https://doi.org/10.1007/s11104-017-3378-7

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