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Open AccessArticle

Temperature and Light-Quality-Dependent Regulation of Freezing Tolerance in Barley

1
Festetics Doctoral School, Georgikon Faculty, University of Pannonia, 8360 Keszthely, Hungary
2
Agricultural Institute, Centre for Agricultural Research, 2462 Martonvásár, Hungary
3
Department of Genetics and Plant Breeding, Crop Research Institute, 161 06 Prague 6, Czech Republic
*
Author to whom correspondence should be addressed.
Plants 2020, 9(1), 83; https://doi.org/10.3390/plants9010083
Received: 22 November 2019 / Revised: 31 December 2019 / Accepted: 7 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue Plant and Microbe Adaptations to Cold)
It is established that, besides the cold, incident light also has a crucial role in the cold acclimation process. To elucidate the interaction between these two external hardening factors, barley plantlets were grown under different light conditions with low, normal, and high light intensities at 5 and 15 °C. The expression of the HvCBF14 gene and two well-characterized members of the C-repeat binding factor (CBF)-regulon HvCOR14b and HvDHN5 were studied. In general, the expression level of the studied genes was several fold higher at 5 °C than that at 15 °C independently of the applied light intensity or the spectra. The complementary far-red (FR) illumination induced the expression of HvCBF14 and also its target gene HvCOR14b at both temperatures. However, this supplementation did not affect significantly the expression of HvDHN5. To test the physiological effects of these changes in environmental conditions, freezing tests were also performed. In all the cases, we found that the reduced R:FR ratio increased the frost tolerance of barley at every incident light intensity. These results show that the combined effects of cold, light intensity, and the modification of the R:FR light ratio can greatly influence the gene expression pattern of the plants, which can result in increased plant frost tolerance. View Full-Text
Keywords: barley; frost tolerance; HvCBF14; CBF regulon; LED lighting; far-red light; low temperature barley; frost tolerance; HvCBF14; CBF regulon; LED lighting; far-red light; low temperature
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Ahres, M.; Gierczik, K.; Boldizsár, Á.; Vítámvás, P.; Galiba, G. Temperature and Light-Quality-Dependent Regulation of Freezing Tolerance in Barley. Plants 2020, 9, 83.

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