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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Abiotic Stress
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1459121
This article is part of the Research Topic Salinity and Drought Stress in Plants: Understanding Physiological, Biochemical and Molecular Responses Volume II View all 5 articles

Exogenous Uniconazole promotes Physiological Metabolism and Grain Yield of Rice under Salt Stress

Provisionally accepted
Xiaole Du Xiaole Du You Wei Du You Wei Du Naijie Feng Naijie Feng *Dianfeng Zheng Dianfeng Zheng *Hang Zhou Hang Zhou *Jingxin Huo Jingxin Huo
  • College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, Guangdong Province, China

The final, formatted version of the article will be published soon.

    Salt stress severely inhibit plant growth and development. Uniconazole has been considered to significantly increase plant stress tolerance. However, the mechanism by which Uniconazole induces salt tolerance in rice seedlings and its impact on yield is still unclear. In this study, the effects of exogenous Uniconazole on morphogenesis, physiological metabolism, and yield of rice seedlings under salt stress were analyzed using the salt-tolerant rice variety HD961 and the salt-sensitive rice variety 9311. The results showed that salt stress significantly inhibited rice growth, disrupted the antioxidant system and pigment accumulation, and reduced photosynthesis, and yield. There were corresponding percent decreases of 13.0% and 24.1% in plant height, 31.6% and 55.8% in leaf area, 65.7% and 85.3% in root volume, respectively for HD961 and 9311. spraying However, compared to salt stress, the US treatment increased the percentage to 4.7% and 139.0% in root volume, 7.5% and 38.0% in total chlorophyll, 4.5% and 14.3% in peroxidase (POD) of leaves, 14.4% and 54.2% in POD of roots, 18.7% and 22.7% in catalase (CAT) of leaves, and 22.6% and 53.9% in CAT of roots, respectively, for HD961 and 9311. In addition, it also significantly enhanced photosynthesis at the reproductive stage, promoted the transport of carbohydrate to grains. And US treatment significantly increased the percentage to 9.0% in panicle length, 28.0% in panicle number per hole, 24.0% in filled grain number, 3.0% in 1000-grain weight, and 26.0% in yield per plant, respectively, for HD961, compared to salt stress. In summary, applying Uniconazole at the seedling stage can alleviate the damage induced by NaCl stress on rice by regulating the physiological metabolism of rice plants. This reduces the negative effects of salt stress, enhance salt tolerance, and boost rice production.

    Keywords: salt stress, rice, uniconazole, physiological, yield

    Received: 03 Jul 2024; Accepted: 29 Aug 2024.

    Copyright: © 2024 Du, Du, Feng, Zheng, Zhou and Huo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Naijie Feng, College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, Guangdong Province, China
    Dianfeng Zheng, College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, Guangdong Province, China
    Hang Zhou, College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, Guangdong Province, China

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