Perturbation and Disruption of Plant Hormone Signaling by Organic Xenobiotic Pollution

Serra, Anne-Antonella; Alberto, Diana; Ramel, Fanny; Gouesbet, Gwenola; Sulmon, Cécile; Couée, Ivan

doi:10.1002/9781118889022.ch25

Cited by 2 publications

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“…Such analysis confirmed that responses to low doses of triazines involved coordinated signaling pathways related to stress responses, light and hormones, with potential antagonist roles for CK and ABA signaling [102]. Involvement of CK signaling was reminiscent of previouslydescribed relationships between xenobiotic impacts and hormone-crosstalk transduction pathways [8,22,23,103] and especially potential relationships between ATZ-related and CKrelated signaling pathways [97,104,105]. Promoters of all triazine-responsive DEGs were investigated for the presence of these novel CK-responsive cis elements [17].…”

Section: Accepted Manuscriptsupporting

confidence: 53%

Low doses of triazine xenobiotics mobilize ABA and cytokinin regulations in a stress- and low-energy-dependent manner

et al. 2018

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The extent of residual contaminations of pesticides through drift, run-off and leaching is a potential threat to non-target plant communities. Arabidopsis thaliana responds to low doses of the herbicide atrazine, and of its degradation products, desethylatrazine and hydroxyatrazine, not only in the long term, but also under conditions of short-term exposure. In order to investigate underlying molecular mechanisms of low-dose responses and to decipher commonalities and specificities between different chemical treatments, parallel transcriptomic studies of the early effects of the atrazine-desethylatrazine-hydroxyatrazine chemical series were undertaken using whole-genome microarrays. All of the triazines under study produced coordinated and specific changes in gene expression. Hydroxyatrazine-responsive genes were mainly linked to root development, whereas atrazine and desethylatrazine mostly affected molecular signaling networks implicated in stress and hormone responses. Analysis of signaling-related genes, promoter sites and shared-function interaction networks highlighted the involvement of energy-, stress-, abscisic acid- and cytokinin-regulated processes, and emphasized the importance of cold-, heat- and drought-related signaling in the perception of low doses of triazines. These links between low-dose xenobiotic impacts and stress-hormone crosstalk pathways give novel insights into plant-pesticide interactions and plant-pollution interactions that are essential for toxicity evaluation in the context of environmental risk assessment.

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