Abstract
Three cucumber cultivars (cv. Suyo, Shimoshirazu-jibaikyuuri and Tsukemidori) were grown for 3 weeks in sun-lit environmental glass chambers under UV-B (290-320nm) irradiation from six 20W fluorescent sunlamps using 0.10mm polyvinyl chloride sheeting and UV-B free control conditions using 0.10mm polyester film. Plants were irradiated with three levels (0, 244 and 381mW m-2) of biologically effective UV-B (UV-BBE) for 8h (8 a.m. to 4 p.m.) a day. The levels of UV-BBE irradiance at Tsukuba (36°N latitude) were about 250mW m-2 at noon in summer under clear sky conditions. Visible foliar injury (yellow lesions and glazing) due to UV-B irradiation occurred on the leaf surface. The leaf area and dry weight of whole plants of the three cultivars of cucumber were significantly reduced and decreased with increasing intensities of UV-BBE irradiation. Growth parameters of the relative growth rate (RGR), the net assimilation rate (NAR) and leaf area ratio (LAR) were reduced by medium and high UV-BBE irradiation throughout irradiation periods. Specific leaf area (SLA) decreased remarkably due to UV-B, which indicates that plants exposed to UV-B increase their leaf thickness. This increase of leaf thickness might be an adaptation mechanism against increased UV-B radiation.
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Claims 7
Claim · model-written summary
UV-B caused yellow lesions and glazing on cucumber leaves.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- UV-B irradiatione0
- Outcome
- Visible foliar injury (yellow lesions and glazing)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Visible foliar injury (yellow lesions and glazing) due to UV-B irradiation occurred on the leaf surface.”
t0“cucumber plants”
Claim · model-written summary
Leaf area fell significantly as UV-B intensity rose.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- UV-BBE irradiatione0
- Outcome
- leaf areae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf area and dry weight of whole plants of the three cultivars of cucumber were significantly reduced and decreased with increasing intensities of UV-BBE irradiation.”
Claim · model-written summary
Whole-plant dry weight fell significantly as UV-B intensity rose.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- UV-BBE irradiatione0
- Outcome
- dry weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf area and dry weight of whole plants of the three cultivars of cucumber were significantly reduced and decreased with increasing intensities of UV-BBE irradiation.”
Claim · model-written summary
Medium and high UV-B reduced relative growth rate, net assimilation rate and leaf area ratio.
- Treatment
- medium and high UV-BBE irradiatione0
- Outcome
- relative growth rate (RGR), the net assimilation rate (NAR) and leaf area ratio (LAR)e0
- Direction
- reducede0
Not reportedTaxonComparator
Verbatim
e0“Growth parameters of the relative growth rate (RGR), the net assimilation rate (NAR) and leaf area ratio (LAR) were reduced by medium and high UV-BBE irradiation throughout irradiation periods.”
Claim · model-written summary
UV-B markedly reduced specific leaf area.
Not reportedTaxonComparator
Verbatim
e0“Specific leaf area (SLA) decreased remarkably due to UV-B, which indicates that plants exposed to UV-B increase their leaf thickness.”
Claim · model-written summary
UV-B increased leaf thickness.
Not reportedTaxonComparator
Verbatim
e0“Specific leaf area (SLA) decreased remarkably due to UV-B, which indicates that plants exposed to UV-B increase their leaf thickness.”
Claim · model-written summary
The authors suggest thicker leaves might adapt cucumber to increased UV-B.
Not reportedTaxon
Verbatim
e0“This increase of leaf thickness might be an adaptation mechanism against increased UV-B radiation.”
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