Abstract
• UVB acclimation at the dose of 3 and 5 μmol m -2 s -1 promotes photosynthesis. • UVB acclimation increases the content of UV-absorbing compounds. • UVB acclimation enhances antioxidant capacity as affected by genotype. • UVB radiation (below 3 μmol m -2 s -1 ) does not reduce biomass accumulation. Cucumbers are distributed worldwide and are therefore exposed to varying levels of UVB radiation. However, the dose-response of cucumber to UVB radiation is unclear. Here, we examined the effects of different doses on photosynthetic performance, UV-absorbing compounds, antioxidant capacity, and growth in cucumber ( Cucumis sativus L.). Three originated cultivars (Changchunmici, Hexin9, and Hexin66) were exposed to UVB radiation at the intensity of 0, 3, and 5 μmol m -2 s -1 for 13 days. Results showed that UVB acclimation led to significant increase in light-saturated photosynthetic rate ( A sat ), with a more pronounced effect in Changchunmici than Hexin9 and Hexin66. The increase in A sat was supported by greater chlorophyll concentration on a leaf basis and thicker leaf, as well as higher antioxidant capacity. Meanwhile, UVB acclimation promoted the accumulation of UV-absorbing compounds (e.g., phenolics, flavonoids, flavonol) irrespective of cultivars, contributing to an enhanced screening or/and defense capacity to cope with UVB radiation. UVB acclimation at any level did not cause the adverse effect on growth parameters (e.g. shoot dry weight, leaf area, and leaf mass area) in all cultivars, except Changchunmici under 5 μmol m -2 s -1 UVB. Thus, we conclude that UVB acclimation within a suitable radiation range does not inhibit cucumber growth, instead, promotes photosynthetic capacity. The study would provide extensive understanding of horticultural plant responses to UVB radiation, facilitating light environment optimization in protected horticulture.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
UVB acclimation significantly increased light-saturated photosynthetic rate, more in Changchunmici than the other cultivars.
- Taxon
- cucumber
Cucumis sativust0 - Material
- Changchunmicie0
- Treatment
- UVB acclimatione0
- Outcome
- light-saturated photosynthetic ratee0
- Direction
- increasee0
- Comparator
- Hexin9 and Hexin66e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UVB acclimation led to significant increase in light-saturated photosynthetic rate ( A sat ), with a more pronounced effect in Changchunmici than Hexin9 and Hexin66”
t0“cucumber”
Claim · model-written summary
UVB acclimation increased leaf chlorophyll concentration and thickness.
- Taxon
- cucumberCucumis sativust0
- Treatment
- UVB acclimatione1
- Outcome
- chlorophyll concentration on a leaf basis and thicker leafe0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater chlorophyll concentration on a leaf basis and thicker leaf”
e1“UVB acclimation led to significant increase in light-saturated photosynthetic rate”
t0“cucumber”
Claim · model-written summary
UVB acclimation increased antioxidant capacity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- UVB acclimatione1
- Outcome
- antioxidant capacitye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher antioxidant capacity”
e1“UVB acclimation led to significant increase in light-saturated photosynthetic rate”
t0“cucumber”
Claim · model-written summary
UVB acclimation promoted UV-absorbing compound accumulation across cultivars.
- Taxon
- cucumberCucumis sativust0
- Treatment
- UVB acclimatione0
- Outcome
- accumulation of UV-absorbing compoundse0
- Direction
- promotede0
- Qualifier
- irrespective of cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UVB acclimation promoted the accumulation of UV-absorbing compounds (e.g., phenolics, flavonoids, flavonol) irrespective of cultivars”
t0“cucumber”
Claim · model-written summary
UVB acclimation did not adversely affect growth parameters in most cultivars.
- Taxon
- cucumberCucumis sativust0
- Treatment
- UVB acclimation at any levele0
- Outcome
- growth parameterse0
- Direction
- did not cause the adverse effecte0
- Qualifier
- except Changchunmici under 5 μmol m -2 s -1 UVBe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UVB acclimation at any level did not cause the adverse effect on growth parameters (e.g. shoot dry weight, leaf area, and leaf mass area) in all cultivars, except Changchunmici under 5 μmol m -2 s -1 UVB”
t0“cucumber”
The same questions in other papers
uv · physiology: pigments · Cucumis sativus (cucumber)Results differ
3 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- no effect
6 papers more in this group
See all 10 papers →uv · growth · Cucumis sativus (cucumber)Results differ
28 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- negative
35 papers more in this group
See all 39 papers →uv · quality: phytochemicals · Cucumis sativus (cucumber)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
2 papers more in this group
See all 6 papers →uv · molecular: metabolites · Cucumis sativus (cucumber)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- no effect
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.