Abstract
The influence of ambient UV radiation on growth, chlorosis, and flavonoid content was examined in four cultivars of cucumber (`Ashley', `Poinsett', `Marketmore', and `Salad Bush'). Plants were grown from seed in UV exclusion chambers consisting of UV transmitting plexiglass (10% T, 285 nm), lined with 3- or 5-mil Llumar (10% T, 399 or 404 nm) to exclude UV-A and UV-B, 5-mil polyester (10%T, 319 nm) to exclude UVB, or cellulose acetate (10% T, 291 nm) to transmit UV-A and UV-B. Plants were grown in 15 cm plastic pots containing vermiculite and were fertilized daily with nutrient solution. Despite their differential sensitivity to supplemental UV-B radiation, all four cultivars responded similarly to the exclusion treatments. After 19 to 21 days, plants grown under ambient UV-A and UV-B generally had less stem, leaf, and root biomass and less total height and total leaf area than those grown under conditions in which UV-A and UV-B or only UV-B was excluded. Flavonoid content, leaf number, and floral development were unaffected by UV. These findings demonstrate the extreme sensitivity of cucumber to current levels of solar UV radiation.
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Claims 6
Claim · model-written summary
All four cucumber cultivars responded similarly to UV exclusion.
- Taxon
- Cucumber
Cucumis sativust0 - Outcome
- responded similarly to the exclusion treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all four cultivars responded similarly to the exclusion treatments”
t0“Cucumber”
Claim · model-written summary
Ambient UV-A and UV-B reduced cucumber stem biomass relative to UV exclusion.
- Taxon
- CucumberCucumis sativust0
- Treatment
- ambient UV-A and UV-Be0
- Outcome
- stem, leaf, and root biomasse0
- Direction
- lesse0
- Comparator
- UV-A and UV-B or only UV-B was excludede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown under ambient UV-A and UV-B generally had less stem, leaf, and root biomass and less total height and total leaf area than those grown under conditions in which UV-A and UV-B or only UV-B was excluded”
t0“Cucumber”
Claim · model-written summary
Ambient UV reduced cucumber height and leaf area relative to exclusion.
- Taxon
- CucumberCucumis sativust0
- Treatment
- ambient UV-A and UV-Be0
- Outcome
- total height and total leaf areae0
- Direction
- lesse0
- Comparator
- UV-A and UV-B or only UV-B was excludede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown under ambient UV-A and UV-B generally had less stem, leaf, and root biomass and less total height and total leaf area than those grown under conditions in which UV-A and UV-B or only UV-B was excluded”
t0“Cucumber”
Claim · model-written summary
UV did not affect cucumber flavonoid content.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UVe0
- Outcome
- Flavonoid contente0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flavonoid content, leaf number, and floral development were unaffected by UV”
t0“Cucumber”
Claim · model-written summary
UV did not affect cucumber leaf number.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UVe0
- Outcome
- leaf numbere0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flavonoid content, leaf number, and floral development were unaffected by UV”
t0“Cucumber”
Claim · model-written summary
UV did not affect cucumber floral development.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UVe0
- Outcome
- floral developmente0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flavonoid content, leaf number, and floral development were unaffected by UV”
t0“Cucumber”
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