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. 2022 Jan 26;12:785699. doi: 10.3389/fpls.2021.785699

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Copyright © 2022 De Kesel, Degroote, Nkurunziza, Singh, Demeestere, De Kock, Anggraini, Matthys, Wambacq, Haesaert, Debode and Kyndt.

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) and the copyright owner(s) 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.

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Establishment of induced resistance (IR) via Cucurbitaceae COld Peeling Extract (CCOPE) derived from melon (Cucumis melo var. cantalupensis; mCOPE) is associated with ethylene (ET) accumulation, lowered abscisic acid (ABA) concentrations, decreased levels of reactive oxygen species (ROS) and a transient increase in lignin content in roots of rice plants. Shoots of 14-days-old rice plants were treated with the buffer used for CCOPE preparation (Control) or mCOPE. Six hours, 1 day and/or 4 days later (6 hpt, 1 dpt, and 4 dpt, respectively), roots were collected to quantify levels of (A) salicylic acid (SA), (B) jasmonic acid (JA), (C) indole-3-acetic acid (IAA), (D) ABA, (E) ET, (F) ROS, and/or (G) lignin. (A–G) Error bars represent the standard error of the mean. Asterisks indicate significant differences upon comparison of mCOPE-treated plants with same-aged, mock-treated control plants. Statistical differences were determined via a two-sided heteroscedastic t-test (p < 0.05). Asterisks indicate statistically significant differences upon comparison of CCOPE- and mock-treated cells.