Abstract
Understanding the wavelength dependence of plant responses is essential for optimizing production and quality of indoor plant cultivation. UVA is the main component of solar UV radiation, but its role on plant growth is poorly understood. Here, two experiments were conducted to examine whether UVA supplementation is beneficial for indoor plant cultivation. Lettuce (Lactuca sativa L. cv. ‘Klee’) was grown under mixed blue, red and far-red light with photon flux density (PFD) of 237μmol m-2 s-1 in the growth room; photoperiod was 16 h. In the first experiment, three UVA intensities with peak wavelengths at 365 nm were used: 10 (UVA-10), 20 (UVA-20) and 30 (UVA-30) μmol m-2 s-1, respectively. In the second experiment, 10 μmol m-2 s-1 UVA radiation were given for 5 (UVA-5d), 10 (UVA-10d) and 15 (UVA-15d) days before harvest on day 15, respectively. Compared with control (no UVA), shoot dry weight was increased by 27%, 29% and 15% in the UVA-10, UVA-20, and UVA-30 treatments, respectively, which correlated with 31% (UVA-10), 32% (UVA-20) and 14% (UVA-30) larger leaf area. Shoot dry weight under the treatments of UVA-5d, UVA-10d and UVA-15d was increased by 18%, 32% and 30%, respectively, and leaf area was increased by 15-26%. For both experiments, UVA radiation substantially enhanced secondary metabolites accumulation, e.g. anthocyanin and ascorbic acid contents were increased by 17-49% and 47-80%, respectively. Moreover, plants grown under the UVA-30 treatment were stressed, as indicated by lipid peroxidation and lower maximum quantum efficiency of photosystem II photochemistry (Fv/Fm). We conclude that UVA supplementation not only stimulates biomass production in controlled environments, but also enhances secondary metabolite accumulation.
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Claims 13
Claim · model-written summary
UVA-10 increased shoot dry weight by 27% versus no UVA.
- Taxon
- Lettuce
Lactuca sativat0 - Treatment
- UVA-10e0
- Outcome
- shoot dry weighte0
- Direction
- increasede0
- Value
- 27%e0
- Comparator
- control (no UVA)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Compared with control (no UVA), shoot dry weight was increased by 27%, 29% and 15% in the UVA-10, UVA-20, and UVA-30 treatments, respectively”
Claim · model-written summary
UVA-20 increased shoot dry weight by 29% versus no UVA.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA-20e0
- Outcome
- shoot dry weighte0
- Direction
- increasede0
- Value
- 29%e0
- Comparator
- control (no UVA)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Compared with control (no UVA), shoot dry weight was increased by 27%, 29% and 15% in the UVA-10, UVA-20, and UVA-30 treatments, respectively”
Claim · model-written summary
UVA-30 increased shoot dry weight by 15% versus no UVA.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA-30e0
- Outcome
- shoot dry weighte0
- Direction
- increasede0
- Value
- 15%e0
- Comparator
- control (no UVA)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Compared with control (no UVA), shoot dry weight was increased by 27%, 29% and 15% in the UVA-10, UVA-20, and UVA-30 treatments, respectively”
Claim · model-written summary
UVA-10 was associated with 31% larger leaf area.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“which correlated with 31% (UVA-10), 32% (UVA-20) and 14% (UVA-30) larger leaf area.”
Claim · model-written summary
UVA-20 was associated with 32% larger leaf area.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“which correlated with 31% (UVA-10), 32% (UVA-20) and 14% (UVA-30) larger leaf area.”
Claim · model-written summary
UVA-30 was associated with 14% larger leaf area.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“which correlated with 31% (UVA-10), 32% (UVA-20) and 14% (UVA-30) larger leaf area.”
Claim · model-written summary
UVA-5d increased shoot dry weight by 18%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA-5de0
- Outcome
- Shoot dry weighte0
- Direction
- increasede0
- Value
- 18%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Shoot dry weight under the treatments of UVA-5d, UVA-10d and UVA-15d was increased by 18%, 32% and 30%, respectively”
Claim · model-written summary
UVA-10d increased shoot dry weight by 32%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA-10de0
- Outcome
- Shoot dry weighte0
- Direction
- increasede0
- Value
- 32%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Shoot dry weight under the treatments of UVA-5d, UVA-10d and UVA-15d was increased by 18%, 32% and 30%, respectively”
Claim · model-written summary
UVA-15d increased shoot dry weight by 30%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA-15de0
- Outcome
- Shoot dry weighte0
- Direction
- increasede0
- Value
- 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Shoot dry weight under the treatments of UVA-5d, UVA-10d and UVA-15d was increased by 18%, 32% and 30%, respectively”
Claim · model-written summary
UVA treatment increased leaf area by 15-26% in the second experiment.
- Taxon
- LettuceLactuca sativat0
- Outcome
- leaf areae0
- Direction
- increasede0
- Value
- 15-26%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“leaf area was increased by 15-26%.”
Claim · model-written summary
UVA increased anthocyanin content by 17-49%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA radiatione0
- Outcome
- anthocyanine0
- Direction
- increasede0
- Value
- 17-49%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“UVA radiation substantially enhanced secondary metabolites accumulation, e.g. anthocyanin and ascorbic acid contents were increased by 17-49% and 47-80%, respectively.”
Claim · model-written summary
UVA increased ascorbic acid content by 47-80%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA radiatione0
- Outcome
- ascorbic acid contentse0
- Direction
- increasede0
- Value
- 47-80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“UVA radiation substantially enhanced secondary metabolites accumulation, e.g. anthocyanin and ascorbic acid contents were increased by 17-49% and 47-80%, respectively.”
Claim · model-written summary
UVA-30 caused lettuce stress indicated by lipid peroxidation and lower Fv/Fm.
- Taxon
- LettuceLactuca sativat0
- Treatment
- UVA-30 treatmente0
- Outcome
- lipid peroxidation and lower maximum quantum efficiency of photosystem II photochemistry (Fv/Fm)e0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“plants grown under the UVA-30 treatment were stressed, as indicated by lipid peroxidation and lower maximum quantum efficiency of photosystem II photochemistry (Fv/Fm).”
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