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Strigolactone Alleviates NaCl Stress by Regulating Antioxidant Capacity and Hormone Levels in Rice ( Oryza sativa L.) Seedlings

Author

Listed:
  • Jianqin Zhang

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Naijie Feng

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China
    Shenzhen Research Institute, Guangdong Ocean University, Shenzhen 518108, China)

  • Dianfeng Zheng

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China
    Shenzhen Research Institute, Guangdong Ocean University, Shenzhen 518108, China)

  • Aaqil Khan

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Youwei Du

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Yaxing Wang

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Rui Deng

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Jiashuang Wu

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Jian Xiong

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Zhiyuan Sun

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Qicheng Zhang

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

  • Mingxin Wang

    (The Coastal Agricultural College, Guangdong Ocean University, Zhanjiang 524088, China
    South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang 524088, China)

Abstract

Salt stress is a key environmental factor altering rice plant growth. Strigolactones (GR24) play a vital role in responding to various abiotic stresses and regulating plant growth. However, the regulatory mechanisms of SLs on rice seedlings under salt stress have not yet been clarified. A pot experiment was undertaken to evaluate the effects of GR24 soaking on the rice variety ‘Huanghuazhan’ (salt-sensitive) seedling growth, antioxidant metabolism, and endogenous hormones under NaCl stress. Results showed that NaCl stress significantly inhibited rice growth; disrupted antioxidant enzymes activity; and increased the content of soluble proteins (SPs), proline (Pro), malondialdehyde (MDA) and hydrogen–peroxide (H 2 O 2 ). GR24 significantly improved photosynthetic pigments and antioxidant–enzyme activities, including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbate–peroxidase (APX); increased SP, ascorbic acid (AsA); and reduced glutathione (GSH) content and MDA, H 2 O 2 , and Pro content, resulting in the mitigation of oxidative injury caused by NaCl stress. Moreover, GR24 significantly increased the content of strigolactones (SLs), cytokinin (CTK), auxin (IAA), Gibberellin A3 (GA3), and IAA/ABA and CTK/ABA ratios and decreased the abscisic acid (ABA). Findings indicated that GR24 alleviated oxidative damage caused by NaCl stress by increasing photosynthetic and antioxidant capacity and maintaining the balance of endogenous hormones, thus improving the salt tolerance of rice seedlings.

Suggested Citation

  • Jianqin Zhang & Naijie Feng & Dianfeng Zheng & Aaqil Khan & Youwei Du & Yaxing Wang & Rui Deng & Jiashuang Wu & Jian Xiong & Zhiyuan Sun & Qicheng Zhang & Mingxin Wang, 2024. "Strigolactone Alleviates NaCl Stress by Regulating Antioxidant Capacity and Hormone Levels in Rice ( Oryza sativa L.) Seedlings," Agriculture, MDPI, vol. 14(9), pages 1-19, September.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:9:p:1662-:d:1483628
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    References listed on IDEAS

    as
    1. Mohammad Faisal & Mohammad Faizan & Sadia Haque Tonny & Vishnu D. Rajput & Tatiana Minkina & Abdulrahman A. Alatar & Ranjith Pathirana, 2023. "Strigolactone-Mediated Mitigation of Negative Effects of Salinity Stress in Solanum lycopersicum through Reducing the Oxidative Damage," Sustainability, MDPI, vol. 15(7), pages 1-13, March.
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