Abstract
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 Photosynthetically 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 CO 2 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 exposed to saturating light intensity showed 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 (F v /F m ) 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.
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Claims 13
Claim · model-written summary
Supplementary UV-B decreased cucumber biomass under broadband white light.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- supplementary UV-Be0
- Outcome
- biomass accumulatione0
- Direction
- decreasede0
- Qualifier
- broad band whitee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B significantly decreased biomass accumulation in the presence of broad band white, blue and green light, but not under red light”
t0“Cucumber”
Claim · model-written summary
Supplementary UV-B decreased cucumber biomass under blue light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- supplementary UV-Be0
- Outcome
- biomass accumulatione0
- Direction
- decreasede0
- Qualifier
- bluee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B significantly decreased biomass accumulation in the presence of broad band white, blue and green light, but not under red light”
t0“Cucumber”
Claim · model-written summary
Supplementary UV-B decreased cucumber biomass under green light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- supplementary UV-Be0
- Outcome
- biomass accumulatione0
- Direction
- decreasede0
- Qualifier
- green lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B significantly decreased biomass accumulation in the presence of broad band white, blue and green light, but not under red light”
t0“Cucumber”
Claim · model-written summary
Supplementary UV-B did not significantly change cucumber biomass under red light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- supplementary UV-Be0
- Outcome
- biomass accumulatione0
- Direction
- note0
- Qualifier
- red lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B significantly decreased biomass accumulation in the presence of broad band white, blue and green light, but not under red light”
t0“Cucumber”
Claim · model-written summary
UV-B with blue light reduced photosynthetic efficiency of CO2 fixation.
- Taxon
- cucumberCucumis sativust0
- Treatment
- UV-Be0
- Outcome
- photosynthetic efficiency of CO 2 fixation (α)e0
- Direction
- reducede0
- Qualifier
- blue lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B also reduced the photosynthetic efficiency of CO 2 fixation (α) when combined with blue light”
t0“Cucumber”
Claim · model-written summary
Cucumber under UV-B and blue light accumulated high anthocyanins.
- Taxon
- cucumberCucumis sativust0
- Outcome
- high accumulation of anthocyaninse0
- Direction
- highe0
- Qualifier
- saturating light conditionse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These plants, despite showing high accumulation of anthocyanins, were unable to cope with saturating light conditions”
t0“Cucumber”
Claim · model-written summary
Cucumber under UV-B and blue light could not cope with saturating light.
- Taxon
- cucumberCucumis sativust0
- Outcome
- unable to cope with saturating light conditionse0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These plants, despite showing high accumulation of anthocyanins, were unable to cope with saturating light conditions”
t0“Cucumber”
Claim · model-written summary
UV-B under green light did not significantly affect gas exchange or chlorophyll fluorescence.
- Taxon
- cucumberCucumis sativust0
- Treatment
- UV-B in combination with green lighte0
- Outcome
- gas exchange and chlorophyll fluorescence parameterse0
- Direction
- No significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant effects of UV-B in combination with green light were observed for gas exchange and chlorophyll fluorescence parameters”
t0“Cucumber”
Claim · model-written summary
Supplementary UV-B under green light increased chlorophyll and flavonol in leaf epidermis.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leaf epidermise0
- Treatment
- supplementary UV-Be0
- Outcome
- chlorophyll and flavonol contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B significantly increased chlorophyll and flavonol contents in the leaf epidermis”
t0“Cucumber”
Claim · model-written summary
Red light plus UV-B increased maximum photosynthetic rate compared with pure red light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- red light and UV-Be0
- Outcome
- maximum photosynthetic ratee0
- Direction
- increasede0
- Comparator
- pure red lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown under red light and UV-B significantly increased maximum photosynthetic rate and dark respiration compared to pure red light”
t0“Cucumber”
Claim · model-written summary
Red light plus UV-B increased dark respiration compared with pure red light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- red light and UV-Be0
- Outcome
- dark respiratione0
- Direction
- increasede0
- Comparator
- pure red lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown under red light and UV-B significantly increased maximum photosynthetic rate and dark respiration compared to pure red light”
t0“Cucumber”
Claim · model-written summary
Red light plus UV-B increased PSII quantum yield, open PSII centres and electron transport rate under saturating light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- red and UV-Be0
- Outcome
- quantum yield of photosystem II (PSII), fraction of open PSII centres and electron transport ratee0
- Direction
- highere0
- Qualifier
- saturating light intensitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“red and UV-B treated plants exposed to saturating light intensity showed higher quantum yield of photosystem II (PSII), fraction of open PSII centres and electron transport rate”
t0“Cucumber”
Claim · model-written summary
Red light plus UV-B did not affect apparent maximum PSII quantum efficiency or non-photochemical quenching under saturating light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- red and UV-Be1
- Outcome
- apparent maximum quantum efficiency of PSII photochemistry (F v /F m ) or non-photochemical quenchinge0
- Direction
- no effecte0
- Comparator
- solely red-light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed no effect on the apparent maximum quantum efficiency of PSII photochemistry (F v /F m ) or non-photochemical quenching, in contrast to solely red-light conditions”
t0“Cucumber”
e1“red and UV-B treated plants exposed to saturating light intensity”
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