Abstract
Studies have shown that natural ultraviolet (UV) radiation increases secondary products such as phenolics but can significantly inhibit biomass accumulation in lettuce plants. In the work presented here, the effect of UV radiation on phenolic concentration and biomass accumulation was assessed in relation to photosynthetic performance in red and green lettuce types. Lettuce plants in polythene clad tunnels were exposed to either ambient (UV transparent film) or UV‐free conditions (UV blocking film). The study tested whether growth reduction in lettuce plants exposed to natural UV radiation is because of inhibition of photosynthesis by direct damage to the photosynthetic apparatus or by internal shading by anthocyanins. Ambient levels of UV radiation did not limit the efficiency of photosynthesis suggesting that phenolic compounds may effectively protect the photosynthetic apparatus. Growth inhibition does, however, occur in red lettuce and could be explained by the high metabolic cost of phenolic compounds for UV protection. From a commercial perspective, UV transparent and UV blocking films offer opportunities because, in combination, they could increase plant quality as well as productivity. Growing plants continuously under a UV blocking film, and then 6 days before the final harvest transferring them to a UV transparent film, showed that high yields and high phytochemical content can be achieved complementarily.
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Claims 4
Claim · model-written summary
Ambient UV did not limit photosynthetic efficiency.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- Ambient levels of UV radiatione0
- Outcome
- efficiency of photosynthesise0
- Direction
- did not limite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ambient levels of UV radiation did not limit the efficiency of photosynthesis”
t0“lettuce”
Claim · model-written summary
UV exposure inhibited growth in red lettuce.
Verbatim
e0“Growth inhibition does, however, occur in red lettuce”
Claim · model-written summary
Shifting lettuce from UV blocking to UV transparent film six days before harvest achieved high yields.
- Taxon
- lettuceLactuca sativat0
- Treatment
- transferring them to a UV transparent filme0
- Outcome
- high yieldse0
- Direction
- highe0
- Qualifier
- 6 days before the final harveste0
- Comparator
- UV blocking filme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growing plants continuously under a UV blocking film, and then 6 days before the final harvest transferring them to a UV transparent film, showed that high yields and high phytochemical content can be achieved complementarily”
t0“lettuce”
Claim · model-written summary
The film shift also achieved high phytochemical content.
- Taxon
- lettuceLactuca sativat0
- Treatment
- transferring them to a UV transparent filme0
- Outcome
- high phytochemical contente0
- Direction
- highe0
- Comparator
- UV blocking filme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growing plants continuously under a UV blocking film, and then 6 days before the final harvest transferring them to a UV transparent film, showed that high yields and high phytochemical content can be achieved complementarily”
t0“lettuce”
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