UV-screening and springtime recovery of photosynthetic capacity in leaves of Vaccinium vitis-idaea above and below the snow pack

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Solanki , T , Aphalo , P J , Neimane , S , Hartikainen , S M , Pieristè , M , Shapiguzov , A , Porcar Castell , J A , Atherton , J M , Heikkilä , A & Robson , T M 2019 , ' UV-screening and springtime recovery of photosynthetic capacity in leaves of Vaccinium vitis-idaea above and below the snow pack ' , Plant Physiology and Biochemistry , vol. 134 , pp. 40-52 . https://doi.org/10.1016/j.plaphy.2018.09.003

Title: UV-screening and springtime recovery of photosynthetic capacity in leaves of Vaccinium vitis-idaea above and below the snow pack
Author: Solanki, Twinkle; Aphalo, Pedro J.; Neimane, Santa; Hartikainen, Saara Maria; Pieristè, Marta; Shapiguzov, Alexey; Porcar Castell, Juan Alberto; Atherton, Jonathan Mark; Heikkilä, Anu; Robson, Thomas Matthew
Other contributor: University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Canopy Spectral Ecology and Ecophysiology
University of Helsinki, Canopy Spectral Ecology and Ecophysiology
University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Department of Forest Sciences
University of Helsinki, Organismal and Evolutionary Biology Research Programme









Date: 2019-01
Language: eng
Number of pages: 13
Belongs to series: Plant Physiology and Biochemistry
ISSN: 0981-9428
DOI: https://doi.org/10.1016/j.plaphy.2018.09.003
URI: http://hdl.handle.net/10138/319053
Abstract: Evergreen plants in boreal biomes undergo seasonal hardening and dehardening adjusting their photosynthetic capacity and photopmtection; acclimating to seasonal changes in temperature and irradiance. Leaf epidermal ultraviolet (UV)-screening by flavonols responds to solar radiation, perceived in part through increased ultraviolet-B (UV-B) radiation, and is a candidate trait to provide cross-photoprotection. At Hyytiala Forestry Station, central Finland, we examined whether the accumulation of flavonols was higher in leaves of Vaccinium vitis-idaea L. growing above the snowpack compared with those below the snowpack. We found that leaves exposed to colder temperatures and higher solar radiation towards the top of hummocks suffered greater photoinhibition than those at the base of hummocks. Epidermal UV-screening was highest in upper-hummock leaves, particularly during winter when lower leaves were beneath the snowpack. There was also a negative relationship between indices of flavonols and anthocyanins across all leaves suggesting fine-tuning of flavonoid composition for screening vs. antioxidant activity in response to temperature and irradiance. However, the positive correlation between the maximum quantum yield of photosystem II photochemistry (F-v/F-m) and flavonol accumulation in upper hummock leaves during dehardening did not confer on them any greater cross-protection than would be expected from the general relationship of F-v/F-m with temperature and irradiance (throughout the hummocks). Irrespective of timing of snow-melt, photosynthesis fully recovered in all leaves, suggesting that V. vills-idaea has the potential to exploit the continuing trend for longer growing seasons in central Finland without incurring significant impairment from reduced duration of snow cover.
Subject: 1183 Plant biology, microbiology, virology
Spring dehardening
Flavonoids
Anthocyanins
Understorey
Spectral quality
Photoprotection
Arctic browning
SUB-ARCTIC HEATH
CLIMATE-CHANGE
B RADIATION
DWARF SHRUB
LOW-TEMPERATURE
PHOTOSYSTEM-II
BOREAL
WINTER
LIGHT
LEAF
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