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.
Original languageEnglish
JournalPlant Physiology and Biochemistry
Volume134
Pages (from-to)40-52
Number of pages13
ISSN0981-9428
DOIs
Publication statusPublished - 4 Sep 2018
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 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

Cite this

@article{45e56f5bc80948f0be92eb3bc5e05659,
title = "UV-screening and springtime recovery of photosynthetic capacity in leaves of Vaccinium vitis-idaea above and below the snow pack.",
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.",
keywords = "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",
author = "Twinkle Solanki and Aphalo, {Pedro J.} and Santa Neimane and Hartikainen, {Saara Maria} and Marta Pierist{\`e} and Alexey Shapiguzov and {Porcar Castell}, {Juan Alberto} and Atherton, {Jonathan Mark} and Anu Heikkil{\"a} and Robson, {Thomas Matthew}",
year = "2018",
month = "9",
day = "4",
doi = "10.1016/j.plaphy.2018.09.003",
language = "English",
volume = "134",
pages = "40--52",
journal = "Plant Physiology and Biochemistry",
issn = "0981-9428",
publisher = "ELSEVIER FRANCE",

}

TY - JOUR

T1 - UV-screening and springtime recovery of photosynthetic capacity in leaves of Vaccinium vitis-idaea above and below the snow pack.

AU - Solanki, Twinkle

AU - Aphalo, Pedro J.

AU - Neimane, Santa

AU - Hartikainen, Saara Maria

AU - Pieristè, Marta

AU - Shapiguzov, Alexey

AU - Porcar Castell, Juan Alberto

AU - Atherton, Jonathan Mark

AU - Heikkilä, Anu

AU - Robson, Thomas Matthew

PY - 2018/9/4

Y1 - 2018/9/4

N2 - 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.

AB - 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.

KW - 1183 Plant biology, microbiology, virology

KW - Spring dehardening

KW - Flavonoids

KW - Anthocyanins

KW - Understorey

KW - Spectral quality

KW - Photoprotection

KW - Arctic browning

KW - SUB-ARCTIC HEATH

KW - CLIMATE-CHANGE

KW - B RADIATION

KW - DWARF SHRUB

KW - LOW-TEMPERATURE

KW - PHOTOSYSTEM-II

KW - BOREAL

KW - WINTER

KW - LIGHT

KW - LEAF

U2 - 10.1016/j.plaphy.2018.09.003

DO - 10.1016/j.plaphy.2018.09.003

M3 - Article

VL - 134

SP - 40

EP - 52

JO - Plant Physiology and Biochemistry

JF - Plant Physiology and Biochemistry

SN - 0981-9428

ER -