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Ahres M, Pálmai T, Kovács T, Kovács L, Lacek J, Vankova R, Galiba G, Borbély P. The Effect of White Light Spectrum Modifications by Excess of Blue Light on the Frost Tolerance, Lipid- and Hormone Composition of Barley in the Early Pre-Hardening Phase. PLANTS (BASEL, SWITZERLAND) 2022; 12:40. [PMID: 36616169 PMCID: PMC9823678 DOI: 10.3390/plants12010040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/15/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
It is well established that cold acclimation processes are highly influenced, apart from cold ambient temperatures, by light-dependent environmental factors. In this study we investigated whether an extra blue (B) light supplementation would be able to further improve the well-documented freezing tolerance enhancing effect of far-red (FR) enriched white (W) light. The impact of B and FR light supplementation to white light (WFRB) on hormone levels and lipid contents were determined in winter barley at moderate (15 °C) and low (5 °C) temperatures. Low R:FR ratio effectively induced frost tolerance in barley plantlets, but additional B light further enhanced frost hardiness at both temperatures. Supplementation of WFR (white light enriched with FR light) with B had a strong positive effect on abscisic acid accumulation while the suppression of salicylic acid and jasmonic acid levels were observed at low temperature which resembles the shade avoidance syndrome. We also observed clear lipidomic differences between the individual light and temperature treatments. WFRB light changed the total lipid content negatively, but monogalactosyldiacylglycerol (MGDG) content was increased, nonetheless. Our results prove that WFRB light can greatly influence phytohormone dynamics and lipid contents, which eventually leads to more efficient pre-hardening to avoid frost damage.
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Affiliation(s)
- Mohamed Ahres
- Centre for Agricultural Research, Agricultural Institute, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
| | - Tamás Pálmai
- Centre for Agricultural Research, Agricultural Institute, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
| | - Terézia Kovács
- Biological Research Centre, Institute of Plant Biology, H-6701 Szeged, Hungary
| | - László Kovács
- Biological Research Centre, Institute of Plant Biology, H-6701 Szeged, Hungary
| | - Jozef Lacek
- Institute of Experimental Botany of the Czech Academy of Sciences, 165 02 Prague, Czech Republic
- Department of Experimental Plant Biology, Faculty of Science, Charles University, 128 00 Prague, Czech Republic
| | - Radomira Vankova
- Institute of Experimental Botany of the Czech Academy of Sciences, 165 02 Prague, Czech Republic
| | - Gábor Galiba
- Centre for Agricultural Research, Agricultural Institute, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
- Department of Agronomy, GEORGIKON Campus, Hungarian University of Agricultural and Life Sciences, 8360 Keszthely, Hungary
| | - Péter Borbély
- Centre for Agricultural Research, Agricultural Institute, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
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Dexter BR, King R, Parisi AV, Harrison SL, Igoe DP, Downs NJ. Electronic Sun Journal Versus Self-report Sun Diary: A Comparison of Recording Personal Sunlight Exposure Methods. Photochem Photobiol 2020; 97:641-649. [PMID: 33264423 DOI: 10.1111/php.13359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 11/25/2020] [Accepted: 11/27/2020] [Indexed: 11/29/2022]
Abstract
This research compared personal sunlight exposure times monitored electronically within suburban Australian environments against self-report paper journals for determining the timing and total duration of individual exposure to daily solar radiation. A total of 90 Electronic Sun Journal (ESJ) daily readings and self-report timing and duration estimates of exposure for weekend and weekdays were compared. A Wilcoxon ranked sign test showed a significant difference (V = 157, P < 0.001) between the duration of exposure recorded electronically and the duration of exposure that was self-reported in a diary. There was also found to be a statistically significant difference between total exposure time measured using both methods for weekends (V = 10, P < 0.001) and weekdays (V = 87, P < 0.001). General trends in outdoor exposure timing confirmed that the most frequent daily exposures received over the weekend occurred between 1 and 2 h earlier than the most frequent exposures received on weekdays. This preliminary research found that exposure durations as recorded by the ESJ were longer on the weekends compared to weekdays (W = 402, P < 0.001) and confirmed that the ESJ is a viable alternative to self-reporting diaries.
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Affiliation(s)
- Benjamin R Dexter
- Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Australia
| | - Rachel King
- Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Australia
| | - Alfio V Parisi
- Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Australia.,School of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Australia
| | - Simone L Harrison
- School of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Australia
| | - Damien P Igoe
- Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Australia
| | - Nathan J Downs
- Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Australia.,School of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Australia
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