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Natural variation of an EF-hand Ca2+-binding-protein coding gene confers saline-alkaline tolerance in maize

Author

Listed:
  • Yibo Cao

    (China Agricultural University)

  • Ming Zhang

    (China Agricultural University)

  • Xiaoyan Liang

    (China Agricultural University)

  • Fenrong Li

    (China Agricultural University)

  • Yunlu Shi

    (China Agricultural University)

  • Xiaohong Yang

    (China Agricultural University
    China Agricultural University
    China Agricultural University)

  • Caifu Jiang

    (China Agricultural University
    China Agricultural University
    Outstanding Discipline Program for the Universities in Beijing)

Abstract

Sodium (Na+) toxicity is one of the major damages imposed on crops by saline-alkaline stress. Here we show that natural maize inbred lines display substantial variations in shoot Na+ contents and saline-alkaline (NaHCO3) tolerance, and reveal that ZmNSA1 (Na+ Content under Saline-Alkaline Condition) confers shoot Na+ variations under NaHCO3 condition by a genome-wide association study. Lacking of ZmNSA1 promotes shoot Na+ homeostasis by increasing root Na+ efflux. A naturally occurred 4-bp deletion decreases the translation efficiency of ZmNSA1 mRNA, thus promotes Na+ homeostasis. We further show that, under saline-alkaline condition, Ca2+ binds to the EF-hand domain of ZmNSA1 then triggers its degradation via 26S proteasome, which in turn increases the transcripts levels of PM-H+-ATPases (MHA2 and MHA4), and consequently enhances SOS1 Na+/H+ antiporter-mediated root Na+ efflux. Our studies reveal the mechanism of Ca2+-triggered saline-alkaline tolerance and provide an important gene target for breeding saline-alkaline tolerant maize varieties.

Suggested Citation

  • Yibo Cao & Ming Zhang & Xiaoyan Liang & Fenrong Li & Yunlu Shi & Xiaohong Yang & Caifu Jiang, 2020. "Natural variation of an EF-hand Ca2+-binding-protein coding gene confers saline-alkaline tolerance in maize," Nature Communications, Nature, vol. 11(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-019-14027-y
    DOI: 10.1038/s41467-019-14027-y
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    Cited by:

    1. Yanyan Wang & Yibo Cao & Xiaoyan Liang & Junhong Zhuang & Xiangfeng Wang & Feng Qin & Caifu Jiang, 2022. "A dirigent family protein confers variation of Casparian strip thickness and salt tolerance in maize," Nature Communications, Nature, vol. 13(1), pages 1-14, December.

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