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Improved salt tolerance in a wheat stay-green mutant tasg1

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Abstract

Salt stress inhibited the growth of both tasg1 and wild-type (WT) wheat seedlings, but the inhibition in tasg1 plants was relatively weaker than that of WT. Compared to the WT, the chlorophyll content, thylakoid membrane polypeptides, Hill reaction activity, actual photochemical efficiency of PSII (ΦPSII), and Mg2+- and Ca2+-ATPase activities were higher in tasg1 under salt stress. At the same time, the photosynthetic activity of the tasg1 was significantly higher than that of WT. In addition, tasg1 plants displayed relatively less accumulation of reactive oxygen species and oxidative damage accompanied by higher activity of some antioxidant enzymes, and the up-regulation of antioxidant genes further demonstrated the improvement of antioxidant activity in tasg1 under salt stress. Furthermore, tasg1 plants also showed relatively weaker Na+ fluorescence and lower Na+ content, but relatively higher content of K+ in their roots and shoots, and then, the roots of tasg1 plants enhanced net outward Na+ flux and a correspondingly increased net inward K+ flux during salt stress. This might be associated with the relatively higher activity of H+-ATPase in tasg1 plants. These results suggest that the improved antioxidant competence and Na+/K+ ion homeostasis play an important role in the enhanced salinity tolerance of tasg1 plants.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (No. 31370304) and by Funds of Shandong “Double Tops”.

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Author notes

  1. Wenqiang Wang, Fengxia Tian, Qunqun Hao, Yangyang Han, and Qinxue Li have contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Crop Biology, Shandong Agricultural University, College of Life Sciences, Tai’an, China

    Wenqiang Wang, Qinxue Li, Xin Wang, Wenlong Wang, Yong Wang & Wei Wang

  2. State Key Laboratory of Crop Biology, Shandong Agricultural University, College of Agronomy, Tai’an, China

    Qunqun Hao

  3. College of Life Science and Technology, Nanyang Normal University, Nanyang, China

    Fengxia Tian

  4. School of Biological Sciences, Weifang Medical University, Weifang, China

    Wenqiang Wang, Qunqun Hao & Yangyang Han

Authors
  1. Wenqiang Wang
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  2. Fengxia Tian
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  3. Qunqun Hao
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  4. Yangyang Han
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  6. Xin Wang
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  7. Wenlong Wang
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  8. Yong Wang
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  9. Wei Wang
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Correspondence to Wei Wang.

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Communicated by J. Huang.

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Wang, W., Tian, F., Hao, Q. et al. Improved salt tolerance in a wheat stay-green mutant tasg1. Acta Physiol Plant 40, 39 (2018). https://doi.org/10.1007/s11738-018-2617-8

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  • DOI: https://doi.org/10.1007/s11738-018-2617-8

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