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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Abiotic Stress
Volume 16 - 2025 | doi: 10.3389/fpls.2025.1506873

Alginate oligosaccharides trigger multiple defence responses in tobacco and induce resistance to Phytophthora infestans

Provisionally accepted
Chune Peng Chune Peng 1Wei Xu Wei Xu 1Xipan Wang Xipan Wang 2Fanxiao Meng Fanxiao Meng 2Qingbin Wang Qingbin Wang 3Xinkun Wang Xinkun Wang 1Rathna Silviya Lodi Rathna Silviya Lodi 1Xiaodan Dong Xiaodan Dong 1*Changxiang Zhu Changxiang Zhu 2*Lizeng Peng Lizeng Peng 1*
  • 1 Shandong Academy of Agricultural Sciences, Jinan, China
  • 2 Shandong Agricultural University, Taian, Shandong Province, China
  • 3 Qilu Normal University, Jinan, Shandong, China

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

    Alginate oligosaccharides (AOS), important plant immunity inducers, are widely used in agriculture because of their important role in the biological control of crop diseases. However, the mechanism by which AOS induce plant resistance to pathogens is not clear. Here, we report the AOS with a degree of polymerization of 2-5, which was obtained by a newly reported enzyme Aly2. AOS treatment exhibited high activity in enhancing resistance to Phytophthora infestans (P. infestans). AOS significantly induced reactive oxygen species (ROS) accumulation, calcium influx, stomata closure and callose deposition. The salicylic acid (SA) synthesis related gene and the defense-related genes were upregulated after AOS treatment. A transcriptome file generated from AOS-treated seedlings verified the SA pathway and suggested the presence of chitin elicitor receptor kinase (CERK). The subsequent results showed that AtCERK1 bind AOS tightly, suggesting AtCERK1 is responsible for AOS recognition. This study laid a theoretical foundation for the broad application of AOS.

    Keywords: Alginate oligosaccharides, immune inducer, Defense response, Salicylic Acid, Chitin elicitor receptor kinase

    Received: 06 Oct 2024; Accepted: 10 Jan 2025.

    Copyright: © 2025 Peng, Xu, Wang, Meng, Wang, Wang, Lodi, Dong, Zhu and Peng. 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:
    Xiaodan Dong, Shandong Academy of Agricultural Sciences, Jinan, China
    Changxiang Zhu, Shandong Agricultural University, Taian, 271018, Shandong Province, China
    Lizeng Peng, Shandong Academy of Agricultural Sciences, Jinan, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.