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Exogenic Melatonin Reduces the Toxic Effect of Polymetallic Stress on Barley Plants


The effect of melatonin on growth parameters, the photochemical activity of photosystem II (PS II), the content of the main photosynthetic pigments, and lipid peroxidation in barley plant leaves under polymetallic stress were studied. Melatonin reduces the toxic effect of polymetals on biomass accumulation, root growth, and maintenance of the assimilating surface. The protective action of the hormone is based on its ability to reduce the intensity of oxidative stress by maintaining the level of carotenoids and increasing the activity of superoxide dismutase, but not by regulating the photochemical activity of chloroplasts. The effectiveness of melatonin does not depend on the duration of exposure. The data obtained can be the basis for optimizing the use of melatonin as a plant priming inducer.

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The reported study was funded by RFBR project number 19-34-90051.

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Correspondence to E. D. Danilova.

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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Translated by M. Batrukova

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Danilova, E.D., Zlobin, I.E., Kuznetsov, V.V. et al. Exogenic Melatonin Reduces the Toxic Effect of Polymetallic Stress on Barley Plants. Dokl Biochem Biophys 499, 228–232 (2021).

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  • melatonin
  • Hordeum vulgare
  • polymetallic pollution
  • photosynthetic pigments
  • photosystem II
  • lipid peroxidation
  • superoxide dismutase
  • priming