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. 2021 Jun 30;12:691835. doi: 10.3389/fpls.2021.691835

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Copyright © 2021 Kong, Sheng, Liang, Ali, Gu, Wu, Chen, Liu and Gao.

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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The transmembrane receptors trP47363 and trP13076 play a key role in melatonin, 5-methoxytryptamin, and 5-methoxyindole activation of the SA-signaling pathway. MT, 5-methoxytryptamine, and 5-methoxyindole induced expression of the SA marker gene, PR-1a, in leaves of wild-type and VIGS mutants of N. benthamiana. (A) RT-qPCR analysis of PR-1a gene expression in response to MT, 5-methoxytryptamine, and 5-methoxyindole treatments in wild-type plants. Values were normalized to levels of EF-1a expression. Values represent the mean relative expression level (fold-change) with expression levels in the control set to 1.0 ± standard deviation (SD; n = 9). (B) RT-qPCR analysis of MT, 5-methoxytryptamin, and 5-methoxyindole induced PR-1a gene expression in the mutant, ΔNbtrP49122-trP40966. (C,D) RT-qPCR analysis of MT, 5-methoxytryptamine, and 5-methoxyindole induced expression of PR-1a in leaves of the mutant lines, ΔNbtrP47363-trP13076 and ΔNbtrP47363-trP13076-trP49122-trP40966.