Journal
PLANT CELL AND ENVIRONMENT
Volume 39, Issue 1, Pages 222-230Publisher
WILEY
DOI: 10.1111/pce.12609
Keywords
acclimation; chlorophyll fluorescence; diurnal change; epidermal UV-transmittance; quercetin; UV-A; UV-absorbing compounds; UV-B; UV protection
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Funding
- Louisiana Board of Regents (SURE/NSF) [LEQSF-EPS (2013)-SURE-85]
- US National Science Foundation (NSF, University of Wisconsin-Madison) [DEB-0841609]
- US Department of Agriculture UV-Monitoring Program (USDA-CSREES via Colorado State University) [2004-34263-14270]
- Utah Agricultural Experiment Station
- Loyola University J. H. Mullahy Endowment in Environmental Biology
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The accumulation of ultraviolet (UV)-absorbing compounds (flavonoids and related phenylpropanoids) and the resultant decrease in epidermal UV transmittance (T-UV) are primary protective mechanisms employed by plants against potentially damaging solar UV radiation and are critical components of the overall acclimation response of plants to changing solar UV environments. Whether plants can adjust this UV sunscreen protection in response to rapid changes in UV, as occurs on a diurnal basis, is largely unexplored. Here, we use a combination of approaches to demonstrate that plants can modulate their UV-screening properties within minutes to hours, and these changes are driven, in part, by UV radiation. For the cultivated species Abelmoschus eseulentus, large (30-50%) and reversible changes in T-UV occurred on a diurnal basis, and these adjustments were associated with changes in the concentrations of whole-leaf UV-absorbing compounds and several quercetin glycosides. Similar results were found for two other species (Vicia faba and Solanum lycopersicum), but no such changes were detected in Zea mays. These &Wings reveal a much more dynamic UV-protection mechanism than previously recognized, raise important questions concerning the costs and benefits of UV-protection strategies in plants and have practical implications for employing UV to enhance crop vigor and quality in controlled enviromnents.
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