Abstract
Higher plants are exposed to natural environmental organic chemicals, associated with plant–environment interactions, and xenobiotic environmental organic chemicals, associated with anthropogenic activities. The effects of these chemicals result not only from interaction with metabolic targets, but also from interaction with the complex regulatory networks of hormone signaling. Purpose-designed plant hormone analogues thus show extensive signaling effects on gene regulation and are as such important for understanding plant hormone mechanisms and for manipulating plant growth and development. Some natural environmental chemicals also act on plants through interference with the perception and transduction of endogenous hormone signals. In a number of cases, bioactive xenobiotics, including herbicides that have been designed to affect specific metabolic targets, show extensive gene regulation effects, which are more in accordance with signaling effects than with consequences of metabolic effects. Some of these effects could be due to structural analogies with plant hormones or to interference with hormone metabolism, thus resulting in situations of hormone disruption similar to animal cell endocrine disruption by xenobiotics. These hormone-disrupting effects can be superimposed on parallel metabolic effects, thus indicating that toxicological characterisation of xenobiotics must take into consideration the whole range of signaling and metabolic effects. Hormone-disruptive signaling effects probably predominate when xenobiotic concentrations are low, as occurs in situations of residual low-level pollutions. These hormone-disruptive effects in plants may thus be of importance for understanding cryptic effects of low-dosage xenobiotics, as well as the interactive effects of mixtures of xenobiotic pollutants.




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- ABA:
-
Abscisic acid
- AHL:
-
N-acyl-l-homoserine lactone
- AhR:
-
Aryl hydrocarbon receptor
- AP2:
-
APETALA 2
- CRF:
-
Cytokinin response factor
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- ERF:
-
Ethylene-responsive element binding factor
- IAA:
-
Indole-3-acetic acid
- NAA:
-
Naphthalene-1-acetic acid
- PAH:
-
Polycyclic aryl hydrocarbon
- PGPR:
-
Plant growth-promoting rhizobacteria
- PSII:
-
Photosystem II
- ROS:
-
Reactive oxygen species
- SCL:
-
SCARECROW-like
- TF:
-
Transcription factor
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Acknowledgments
Our research on xenobiotic stress and on plant–pesticide interactions is funded, in part, by the “Ecosphère continentale et côtière” funding programme and the “Ingénierie écologique” interdisciplinary programme from the Centre National de la Recherche Scientifique (CNRS, France) and by the Fondation pour la recherche sur la biodiversité (FRB, France). AAS is supported by a doctoral scholarship from the Brittany regional council (France).
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Communicated by P. Kumar.
A contribution to the Special Issue: Plant Hormone Signaling.
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Couée, I., Serra, AA., Ramel, F. et al. Physiology and toxicology of hormone-disrupting chemicals in higher plants. Plant Cell Rep 32, 933–941 (2013). https://doi.org/10.1007/s00299-013-1428-z
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DOI: https://doi.org/10.1007/s00299-013-1428-z