Abstract
Summary In Europe, lettuce ( Lactuca sativa L., Asteraceae ) is commonly raised in greenhouses and transplanted to the field at the age of two to four weeks in order to prolong the growing season. The sudden exposure to outdoor conditions including altered temperature, radiation levels and rainfall events is extremely stressful for non-acclimated seedlings. Particularly the increase in ultraviolet-B radiation is considered a serious threat. A new approach to pre-acclimate seedlings to ambient ultraviolet-B radiation is the use of ultraviolet-B transparent covering materials. In order to estimate the benefit of UV-B pre-acclimation, lettuce plants were raised in greenhouses covered with three different materials varying in ultraviolet-B transmittance and transplanted to the field at the age of three weeks. Ultraviolet-B exposure during the greenhouse period led to a reduction in growth (leaf length, leaf area and leaf number) and an increase in flavonoid content. Transplantation to the field induced a strong enhancement in flavonoid content and a severe growth reduction overriding differences between UV-B treatment groups within a few days. At the time of harvest plant fresh weight was therefore independent from previous ultraviolet-B treatment. Effects of UV-B acclimation on plant performance immediately after transplantation require more detailed examination.
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Claims 5
Claim · model-written summary
Greenhouse ultraviolet-B exposure reduced lettuce leaf length, area and number.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- Ultraviolet-B exposuree0
- Outcome
- growth (leaf length, leaf area and leaf number)e0
- Direction
- reductione0
- Setting
- greenhouse periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ultraviolet-B exposure during the greenhouse period led to a reduction in growth (leaf length, leaf area and leaf number)”
t0“lettuce seedlings”
Claim · model-written summary
Greenhouse ultraviolet-B exposure increased lettuce flavonoid content.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Ultraviolet-B exposuree0
- Outcome
- flavonoid contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ultraviolet-B exposure during the greenhouse period led to a reduction in growth (leaf length, leaf area and leaf number) and an increase in flavonoid content”
t0“lettuce seedlings”
Claim · model-written summary
Field transplantation strongly increased lettuce flavonoid content.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Transplantation to the fielde0
- Outcome
- flavonoid contente0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transplantation to the field induced a strong enhancement in flavonoid content”
t0“lettuce seedlings”
Claim · model-written summary
Field transplantation severely reduced lettuce growth and overrode UV-B group differences within days.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Transplantation to the fielde0
- Outcome
- growthe0
- Direction
- reductione0
- Qualifier
- within a few dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transplantation to the field induced a strong enhancement in flavonoid content and a severe growth reduction overriding differences between UV-B treatment groups within a few days”
t0“lettuce seedlings”
Claim · model-written summary
Lettuce fresh weight at harvest was independent of prior UV-B treatment.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- time of harveste0
- Treatment
- previous ultraviolet-B treatmente0
- Outcome
- plant fresh weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the time of harvest plant fresh weight was therefore independent from previous ultraviolet-B treatment”
t0“lettuce seedlings”
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