Abstract
Cold adaptation of winter wheat (Triticum aestivum L.) seedlings was investigated under excessive zinc content (1000 μM) in the root medium. The ability to adapt to chilling temperatures (4°C) in seedlings exposed over seven days to excessive Zn concentrations was lower than in seedlings exposed to optimal composition of mineral nutrients. The impaired adaptation capacity was evident from the lowered content of photosynthetic pigments in leaves, the decreased stomatal conductance, and the reduced water content in shoot tissues. The negative influence of low temperature on plant physiological parameters was enhanced with the prolongation of cold exposure under Zn excess in the root medium, unlike the alleviation of cold-induced disorders during prolonged chilling under optimal Zn concentration (2 μM). Based on this study, we propose that inhibition of photosynthesis and the disturbance of plant water balance are the main factors that impair the low-temperature adaptation of seedlings exposed to high zinc concentrations.
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ACKNOWLEDGMENTS
We are grateful to Drs. N.A. Galibina and K.M. Nikerova (Institute of Forestry, Karelian Research Center, Russian Academy of Sciences) for the help in determination of zinc content in plants.
Funding
The study was supported by the federal budget allocated for the state program no. 0218-2019-0074.
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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 A. Bulychev
Abbreviations: PAR—photosynthetically active radiation; PSA—photosynthetic apparatus; PSII—photosystem II.
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Kaznina, N.M., Batova, Y.V., Laidinen, G.F. et al. Low-Temperature Adaptation of Winter Wheat Seedlings under Excessive Zinc Content in the Root Medium. Russ J Plant Physiol 66, 763–770 (2019). https://doi.org/10.1134/S1021443719050091
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DOI: https://doi.org/10.1134/S1021443719050091