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A dirigent family protein confers variation of Casparian strip thickness and salt tolerance in maize

Author

Listed:
  • Yanyan Wang

    (China Agricultural University)

  • Yibo Cao

    (China Agricultural University
    Beijing Forestry University)

  • Xiaoyan Liang

    (China Agricultural University)

  • Junhong Zhuang

    (China Agricultural University
    China Agricultural University)

  • Xiangfeng Wang

    (China Agricultural University)

  • Feng Qin

    (China Agricultural University
    China Agricultural University)

  • Caifu Jiang

    (China Agricultural University
    China Agricultural University)

Abstract

Plant salt-stress response involves complex physiological processes. Previous studies have shown that some factors promote salt tolerance only under high transpiring condition, thus mediating transpiration-dependent salt tolerance (TDST). However, the mechanism underlying crop TDST remains largely unknown. Here, we report that ZmSTL1 (Salt-Tolerant Locus 1) confers natural variation of TDST in maize. ZmSTL1 encodes a dirigent protein (termed ZmESBL) localized to the Casparian strip (CS) domain. Mutants lacking ZmESBL display impaired lignin deposition at endodermal CS domain which leads to a defective CS barrier. Under salt condition, mutation of ZmESBL increases the apoplastic transport of Na+ across the endodermis, and then increases the root-to-shoot delivery of Na+ via transpiration flow, thereby leading to a transpiration-dependent salt hypersensitivity. Moreover, we show that the ortholog of ZmESBL also mediates CS development and TDST in Arabidopsis. Our study suggests that modification of CS barrier may provide an approach for developing salt-tolerant crops.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29809-0
    DOI: 10.1038/s41467-022-29809-0
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    References listed on IDEAS

    as
    1. 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.
    2. Daniele Roppolo & Bert De Rybel & Valérie Dénervaud Tendon & Alexandre Pfister & Julien Alassimone & Joop E. M. Vermeer & Misako Yamazaki & York-Dieter Stierhof & Tom Beeckman & Niko Geldner, 2011. "A novel protein family mediates Casparian strip formation in the endodermis," Nature, Nature, vol. 473(7347), pages 380-383, May.
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