@article{8764223,
  abstract     = {{Ascorbic acid (AsA) is an important antioxidant in plants and regulates various physiological processes. In this study, we show that exogenous treatments with the oxidized form of AsA, that is, dehydroascorbate (DHA), activates induced systemic resistance in rice against the root-knot nematode Meloidogyne graminicola, and investigate the molecular and biochemical mechanisms underlying this phenotype. Detailed transcriptome analysis on roots of rice plants showed an early and robust transcriptional response on foliar DHA treatment, with induction of several genes related to plant stress responses, immunity, antioxidant activity, and secondary metabolism already at 1 day after treatment. Quantitative and qualitative evaluation of H2O2 levels confirmed the appearance of a reactive oxygen species (ROS) burst on DHA treatment, both at the site of treatment and systemically. Experiments using chemical ROS inhibitors or scavengers confirmed that H2O2 accumulation contributes to DHA-based induced resistance. Furthermore, hormone measurements in DHA-treated plants showed a significant systemic accumulation of the defence hormone salicylic acid (SA). The role of the SA pathway in DHA-based induced resistance was confirmed by nematode infection experiments using an SA-signalling deficient WRKY45-RNAi line and reverse transcription-quantitative PCR on SA marker genes. Our results collectively reveal that DHA activates induced systemic resistance in rice against the root-knot nematode M. graminicola, mediated through the production of ROS and activation of the SA pathway.}},
  author       = {{Chavan, Satish and De Kesel, Jonas and Desmedt, Willem and Degroote, Eva and Singh, Richard Raj and Nguyen Thi, Giang Thanh and Demeestere, Kristof and De Meyer, Tim and Kyndt, Tina}},
  issn         = {{1464-6722}},
  journal      = {{MOLECULAR PLANT PATHOLOGY}},
  keywords     = {{dehydroascorbate,hydrogen peroxide (H2O2),induced resistance,Meloidogyne graminicola,rice,salicylic acid,ACID-INDUCED RESISTANCE,SALICYLIC-ACID,HYDROGEN-PEROXIDE,METHYL SALICYLATE,ASCORBIC-ACID,SYSTEMIC RESISTANCE,DEFENSE ACTIVATION,OXIDATIVE STRESS,TOMATO PLANTS,LEAF-BLIGHT}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{1303--1319}},
  title        = {{Dehydroascorbate induces plant resistance in rice against root‐knot nematode Meloidogyne graminicola}},
  url          = {{http://doi.org/10.1111/mpp.13230}},
  volume       = {{23}},
  year         = {{2022}},
}

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