Spectral Composition of Light Affects Sensitivity to UV-B and Photoinhibition in Cucumber
| Autor: | Carl-Otto Ottosen, Åke Strid, Luis Orlando Morales, Victor Costa Castro-Alves, Carolina Falcato Fialho Palma, Eva Rosenqvist |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine qL Trädgårdsvetenskap/hortikultur Photoinhibition Photosystem II total leaf area transpiration rate specific leaf mass Ci Plant Science Photosynthetic efficiency net photosynthetic rate 01 natural sciences SLM Gs chemistry.chemical_compound quantum yield or operation ifficiency of PSII morphology Pigment accumulation DM Chlorophyll fluorescence Original Research reactive oxygen species intracellular CO2 concentration INL internode lenght Ø chlorophyll fluorescence electron transport rate fraction of open PSII centres Biochemistry and Molecular Biology food and beverages Dry mass percentage ROS LCP curvature DM% CO2 non-photochemical quenching NPQ a [morphology 3 Abbreviations] Fv/Fm TLA LEDs Dry mass light conpensation point fresh mass gas exchange lcsh:Plant culture Horticulture Photosynthesis Fq'/Fm' 03 medical and health sciences An individual leaf area FM lcsh:SB1-1110 photosynthetically active radiation stem diameter 4 maximum photochemical efficiency of PSII leaf mass ratio UV-B maximum net assimilation rate Botany carbon dioxide photosystem II Botanik LMR Ultraviolet-B ILA Light intensity apparent quantum yield of photosynthesis 030104 developmental biology chemistry stomatal conductance Chlorophyll Biophysics light quality PAR chlorophyll flourescence Amax dark respiration cucumber ETR Biokemi och molekylärbiologi Rdark 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science, Vol 11 (2021) Palma, C F F, Castro-Alves, V, Morales, L O, Rosenqvist, E, Ottosen, C-O & Strid, Å 2021, ' Spectral Composition of Light Affects Sensitivity to UV-B and Photoinhibition in Cucumber ', Frontiers in Plant Science, vol. 11, 610011 . https://doi.org/10.3389/fpls.2020.610011 Frontiers in Plant Science Falcato Fialho Palma, C, C. Alves, V, Rosenqvist, E, O. Morales, L, Ottosen, C-O & Strid, Å 2021, ' Spectral composition of light affects plant sensitivity to UV-B and photoinhibition in cucumber ', Frontiers in Plant Science, vol. 11, 610011 . https://doi.org/10.3389/fpls.2020.610011 |
| ISSN: | 1664-462X |
| Popis: | Ultraviolet B (UV-B, 280 – 315 nm) and ultraviolet A (UV-A, 315-400 nm) radiation comprise small portions of the solar radiation but regulate many aspects of plant development, physiology and metabolism. Until now, how plants respond to UV-B in the presence of different light qualities is poorly understood. This study aimed to assess the effects of a low UV-B dose (0.912± 0.074 kJ m-2 day-1, at a 6 h daily UV exposure) in combination with four light treatments (blue, green, red and broadband white at 210 μmol m-2 s-1 Photosynthetic active radiation [PAR]) on morphological and physiological responses of cucumber (Cucumis sativus cv. ‘Lausanna RZ F1’). We explored the effects of light quality backgrounds on plant morphology, leaf gas exchange, chlorophyll fluorescence, epidermal pigment accumulation, and on acclimation ability to saturating light intensity. Our results showed that supplementary UV-B significantly decreased biomass accumulation in the presence of broad band white, blue and green light, but not under red light. UV‐B also reduced the photosynthetic efficiency of CO2 fixation (α) when combined with blue light. These plants, despite showing high accumulation of anthocyanins, were unable to cope with saturating light conditions. No significant effects of UV-B in combination with green light were observed for gas exchange and chlorophyll fluorescence parameters, but supplementary UV-B significantly increased chlorophyll and flavonol contents in the leaf epidermis. Plants grown under red light and UV-B significantly increased maximum photosynthetic rate and dark respiration compared to pure red light. Additionally, red and UV-B treated plants during with saturating light intensity showed an higher quantum yield of photosystem II (PSII), fraction of open PSII centres and electron transport rate and showed no effect on the apparent maximum quantum efficiency of PSII photochemistry (Fv/Fm) or non-photochemical quenching in contrast to solely red-light conditions. These findings provide new insights into how plants respond to UV-B radiation in the presence of different light spectra. Funding Agencies:GUDP (Danish Ministry of Food, Agriculture and Fisheries) Research center iFood Faculty for Business, Science and Technology at Örebro University Örebro University Vice Chancellor's strategic research programme on 'Food and Health' |
| Databáze: | OpenAIRE |
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