Abstract
The presented review is a summary on the current knowledge about metal induced stress response in plants, focusing on the roles of reactive oxygen species, auxin and nitric oxide in roots. The article focuses mainly on the difference between defence and toxicity symptoms of roots during metal-induced stress. Nowadays, pollution of soils by heavy metals is a rapidly growing issue, which affects agriculture and human health. In order to deal with these problems, we must first understand the basic mechanisms and responses to environmental conditions in plants growing under such conditions. Studies so far show somewhat conflicting data, interpreting the same stress responses as both symptoms of defence and toxicity. Therefore, the aim of this review is to give a report about current knowledge of heavy metal-induced stress research, and also to differentiate between toxicity and defence, and outline the challenges of research, focusing on reactive oxygen and nitrogen species, auxin, and the interplay among them. There are still remaining questions on how reactive oxygen and nitrogen species, as well as auxin, can activate either symptoms of toxicity or defence, and adaptation responses.
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This work was supported by the Grant Agency VEGA, project No. 2/0039/16. The authors would also like to thank the anonymous reviewers for their helpful criticisms, who improved the manuscript.
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Demecsová, L., Tamás, L. Reactive oxygen species, auxin and nitric oxide in metal-stressed roots: toxicity or defence. Biometals 32, 717–744 (2019). https://doi.org/10.1007/s10534-019-00214-3
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DOI: https://doi.org/10.1007/s10534-019-00214-3