Different responses to steady and fluctuating UV-B radiation treatments between two grapevine cultivars, and the underlying photoreceptor mechanisms involved in Arabidopsis
Year: 2025
Type: article
Abstract: Ultraviolet–B radiation (UV-B) is the most-energetic region of the solar spectrum received by plants and its absorption by leaves requires specialised adaptations. Natural light is essentially dynamic, yet the effects of fluctuating UV-B radiation on plant ecophysiology remain poorly understood. We investigated how two grapevine ( Vitis vinifera ) cultivars, Tempranillo (red) and Viura (white), respond to fluctuating and steady UV-B treatments in a controlled environment, and explored the underlying processes mediating acclimation using photoreceptor mutants of Arabidopsis thaliana . Plants were grown in a greenhouse under the same daily dose of fluctuating or steady UV-B radiation, paired with their respective attenuated UV-B controls. Leaf chlorophyll epidermal flavonols and photosynthetic capacity were monitored in both cultivars as well as photoassimilates in Arabidopsis . Acclimation was cultivar-specific: whereby flavonol accumulation in response to UV-B was greater in Viura (a 28% increase), although in Tempranillo within-treatment flavonol accumulation was associated with less inhibition of operating efficiency of photosystem II ( ɸ PSII ). In Arabidopsis , responses to both fluctuating and steady UV-B regimes were primarily mediated by the photoreceptor UV RESISTANCE LOCUS 8, with cryptochromes also contributing to flavonol regulation and playing a greater role in photoassimilate accumulation under steady UV-B. Knowledge of these processes across cultivars and conditions can assist in grapevine selection, to guide photoreceptor-centric approaches on the basis of differences in UV-B-radiation acclimation capacity, and to support vineyard management under naturally variable UV-B conditions. These aspects are increasingly important under current global climate change scenarios for such a widespread crop as grapevine.
Language: English
Topic: Light effects on plants
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,990
Funders: Ministerio de Ciencia, Innovación y Universidades, Academy of Finland, China Scholarship Council, Norges Forskningsråd, Agriculture Department of Shaanxi Province, Shaanxi Science and Technology Association, Agencia Estatal de Investigación, Key Research and Development Projects of Shaanxi Province
Awards: G103507813, G1105844351, G1272900390, G4179868744, G4189230686, Fluttering Fields & Wuthering Winds: Canopy Photosynthesis Under High Frequency Sunflecks, G491712853, Center of Excellence in Tree Biology (TreeBio), G5635532810, G614324367, G6338639249, G7333302638, G7631446459, G7805626310, G7863371703, G8497050386, G984602970
OpenAlex ID: W4417067534