uv · Growth · Lactuca sativa (garden lettuce)

Results differ35 papers: 15 positive, 20 negative or no effect · 3 pairs of papers confirmed to differ

66 claims from these papers; 33 citations between them.

Papers whose results differ, checked claim by claim 3

3 pairs of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.

EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) (2015)
decreaseSolar UV radiation significantly decreased lettuce seedling fresh weight.
Effect on the Growth and Nutritional Components in Two Red Lettuces (Lactuca sativa L.) Cultivated Under UV Light in a Mini Plant Factory (2019)
no changeUV radiation incorporation had no effect on fresh weight, leaf area or leaf thickness of red lettuce.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
UVA Radiation Is Beneficial for Yield and Quality of Indoor Cultivated Lettuce (2019)
increaseUVA-10 increased shoot dry weight by 27% versus no UVA.
Effects of Supplemental UV-A LEDs on the Nutritional Quality of Lettuce: Accumulation of Protein and Other Essential Nutrients (2022)
decreaseSix-day UV-A decreased shoot dry mass versus control.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
Influences of UV Radiation on Growth and Nutritional Quality of Three Leaf-color Lettuce Cultivars (2014)
decreaseshoot fresh weight in green lettuce was significantly decreased under UV radiation.
Effect on the Growth and Nutritional Components in Two Red Lettuces (Lactuca sativa L.) Cultivated Under UV Light in a Mini Plant Factory (2019)
no changeUV radiation incorporation had no effect on fresh weight, leaf area or leaf thickness of red lettuce.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →

How these papers cite each other

33 citations between these papers: 18 on the same side, 15 across the two sides.

Positive result
Negative result or no effect
Citation, pointing to the cited paper
Citation across the two sides
Larger circle: more citations overall

Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.

Papers reporting a positive result 15

Influence of Ambient UV Radiation on Growth and Flavonoid Concentration of `New Red Fire' Lettuce · 1997
- positive
  Excluding solar UV-A and UV-B significantly increased lettuce leaf number and shoot and root biomass.
  compared with ambient UV-A and UV-B
Inhibitory effects of ambient levels of solar UV‐A and UV‐B radiation on growth of cv. New Red Fire lettuce · 1998
- positive
  Additional exclusion of UV-A increased dry weight of stems by 33% compared with plants under polyester.
  compared with polyester
- positive
  Excluding solar UV-B increased dry weight of tops by 57% compared with ambient UV-B.
  compared with ambient UV‐B (tefzel or teflon)
- positive
  Excluding solar UV-B increased dry weight of stems by 72% compared with ambient UV-B.
  compared with ambient UV‐B (tefzel or teflon)
- positive
  Additional exclusion of UV-A increased dry weight of tops by 35% compared with plants under polyester.
  compared with polyester
- positive
  Excluding solar UV-B increased fresh weight of tops by 63% compared with ambient UV-B.
  compared with ambient UV‐B (tefzel or teflon)
- positive
  Additional exclusion of UV-A increased dry weight of leaves by 33% compared with plants under polyester.
  compared with polyester
- positive
  Excluding solar UV-B increased dry weight of roots by 47% compared with ambient UV-B.
  compared with ambient UV‐B (tefzel or teflon)
- positive
  Excluding solar UV-B increased dry weight of leaves by 57% compared with ambient UV-B.
  compared with ambient UV‐B (tefzel or teflon)
- no effect
  Additional exclusion of UV-A had no difference in root biomass compared with plants under polyester.
  compared with polyester
cited by 12 papers here
Effects of Supplemental UV-A Irradiation on Growth and Bitterness of Lettuce and Radish Plants Grown under Artificial Light. · 1998
- positive
  UV-A promoted lettuce shoot growth.
UV SUPPLEMENTATION FOR GROWTH REGULATION AND DISEASE CONTROL · 2006
- positive
  UV treatments reduced lettuce leaf area.
- positive
  UV treatments increased lettuce leaf thickness.
cited by 3 papers here
Increased exposure to UV‐B radiation during early development leads to enhanced photoprotection and improved long‐term performance in Lactuca sativa · 2011
- positive
  Relative growth of lettuce plants pre-acclimatized to UV-B was increased.
- negative
  Growth in the UV-inclusive environment showed reduced leaf expansion compared with the UV-depleted environment.
  compared with UV-depleted environment
cites 3 papers herecited by 2 papers here
Ecological responses to UV radiation: interactions between the biological effects of UV on plants and on associated organisms · 2011
- positive
  Lettuce plants grown under zero UV-B had significantly higher shoot fresh weight than under the UV-inclusive filter.
  compared with UV-inclusive filter
cites 5 papers here
Enhancing plant productivity while suppressing biofilm growth in a windowfarm system using beneficial bacteria and ultraviolet irradiation · 2015
- positive
  UV irradiation of the water reservoir reduced algal and biofilm growth.
EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) · 2015
- positive
  UV-B treatment gave the highest lettuce shoot and root length.
- negative
  Solar UV radiation significantly decreased lettuce seedling fresh weight.
cites 1 paper here
Effects of Photoradiation on the Growth and Potassium, Calcium, and Magnesium Uptake of Lettuce Cultivated by Hydroponics · 2018
- positive
  Shortened UV light radiation gave better lettuce growth performance in shoot fresh weight, plant height and number of leaves.
UVA Radiation Is Beneficial for Yield and Quality of Indoor Cultivated Lettuce · 2019
- positive
  UVA-20 was associated with 32% larger leaf area.
- positive
  UVA-30 was associated with 14% larger leaf area.
- positive
  UVA-10 increased shoot dry weight by 27% versus no UVA.
  compared with control (no UVA)
- positive
  UVA-10d increased shoot dry weight by 32%.
- positive
  UVA-10 was associated with 31% larger leaf area.
- positive
  UVA-20 increased shoot dry weight by 29% versus no UVA.
  compared with control (no UVA)
- positive
  UVA-30 increased shoot dry weight by 15% versus no UVA.
  compared with control (no UVA)
- positive
  UVA-15d increased shoot dry weight by 30%.
- positive
  UVA-5d increased shoot dry weight by 18%.
cites 2 papers herecited by 3 papers here
Effect of high salinity and of priming of non-germinated seeds by UV-C light on photosynthesis of lettuce plants grown in a controlled soilless system · 2023
- positive
  UV-C priming moderately increased lettuce growth parameters under salinity.
Supplementary White, UV-A, and Far-Red Radiation Differentially Regulates Growth and Nutritional Qualities of Greenhouse Lettuce · 2023
- positive
  W+FR+UV produced the highest root activity.
- positive
  W+FR+UV increased lettuce leaf length and width relative to other supplemental lights.
  compared with other supplementary light treatments
cites 1 paper here
Enhanced vegetable production in hydroponic systems using decontamination of closed circulating fluid · 2024
- positive
  UV-C decontamination of hydroponic circulation water accelerated lettuce growth.
  compared with control groups without such a system
Fuzzy Logic-Based Hydroponic Vertical Farming System Using UVC for Pathogen and Pest Control · 2025
- positive
  The proposed UVC hydroponic system gave lettuce higher shoot, root and total biomass than the standard system (p<0.05).
  compared with standard system
A Two-Stage Screening-to-Optimization Approach with Mechanistic Model Analysis: Enhancing Anthocyanin in Lettuce Without Yield Loss · 2026
- positive
  UV-A was more compatible with growth and pigmentation than UV-B.
  compared with UV-B
cites 3 papers here

Papers reporting a negative result or no effect 20

The Effects of Nutrient Solution Sterilization on the Growth and Yield of Hydroponically Grown Lettuce · 1987
- no effect
  Lower intensity UV seemed to promote lettuce plant growth slightly, with no consistent, statistically significant effect.
Factors Affecting the Survival of Bremia lactucae Sporangia Deposited on Lettuce Leaves · 2000
- no effect
  UVA had no effect on sporangium viability relative to dark incubation.
  compared with incubation in the darkNo difference from an alternative treatment
- negative
  UVB significantly reduced sporangium viability.
  compared with incubation in the dark
cited by 2 papers here
Ultraviolet Radiation as a Limiting Factor in Leaf Expansion and Development · 2008
- negative
  UV-A wavelengths contributed some reductions in lettuce leaf expansion and final leaf size.
- negative
  UV-B caused the greatest reductions in lettuce leaf expansion and final leaf size.
cites 2 papers herecited by 3 papers here
UV-B transmittance of greenhouse covering materials affects growth and flavonoid content of lettuce seedlings · 2010
- no effect
  Lettuce fresh weight at harvest was independent of prior UV-B treatment.
- negative
  Greenhouse ultraviolet-B exposure reduced lettuce leaf length, area and number.
cites 1 paper herecited by 1 paper here
Development-dependent UV-B Responses in Red Oak Leaf Lettuce (Lactuca sativa L.): Physiological Mechanisms and Significance for Hardening · 2011
- no effect
  Late UV-B treatment produced no growth response in lettuce.
- negative
  Continuous near-ambient UV-B exposure severely reduced lettuce growth.
cites 1 paper here
Development-dependent UV-B responses in red oak leaf lettuce ( Lactuca sativa L.): physiological mechanisms and significance for hardening · 2011
- negative
  Continuous near-ambient UV-B severely reduced lettuce growth.
Interaction of drought stress and UV-B radiation - impact on biomass production and flavonoid metabolism in lettuce (Lactuca sativa L.) · 2013
- no effect
  Dry matter was not significantly affected by UV-B or drought alone or combined.
Growth and phenolic compounds of Lactuca sativa L. grown in a closed‐type plant production system with UV‐A, ‐B, or ‐C lamp · 2013
- negative
  Repeated or gradual UV-B exposure inhibited lettuce growth.
- negative
  Repeated UV-C exposure severely inhibited the growth of lettuce plants.
- no effect
  Continuous UV-A treatment did not inhibit lettuce growth up to 4 days of treatment.
cited by 4 papers here
Low levels of ultraviolet-B radiation from fluorescent tubes induce an efficient flavonoid synthesis in Lollo Rosso lettuce without negative impact on growth · 2014
- negative
  The highest UV-B doses from the UV-B tubes caused some growth reduction in lettuce.
cites 3 papers here
Influences of UV Radiation on Growth and Nutritional Quality of Three Leaf-color Lettuce Cultivars · 2014
- negative
  shoot dry weights in three leaf-color lettuces was lowered greatly under UV radiation.
- negative
  shoot fresh weight in purple lettuce was remarkably reduced under UV radiation.
- no effect
  shoot fresh weight in red lettuce was notably different under UV radiation.
- negative
  shoot fresh weight in green lettuce was significantly decreased under UV radiation.
Changes in Growth and Antioxidant Contents of Romaine Lettuce by Different UV Spectra · 2018
- no effect
  UV-A treatment did not change growth parameters or antioxidant compounds of romaine lettuce relative to control in two cultivars.
  compared with control
- negative
  UV-B treatment caused growth reduction of romaine lettuce in both cultivars.
cites 2 papers here
Effect on the Growth and Nutritional Components in Two Red Lettuces (Lactuca sativa L.) Cultivated Under UV Light in a Mini Plant Factory · 2019
- no effect
  UV radiation incorporation had no effect on fresh weight, leaf area or leaf thickness of red lettuce.
Growth, nutritional quality, and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs · 2020
- no effect
  Ultraviolet supplementation produced no detected growth difference in either lettuce cultivar.
Effects of Supplemental UV-A LEDs on the Nutritional Quality of Lettuce: Accumulation of Protein and Other Essential Nutrients · 2022
- negative
  Six-day UV-A decreased shoot dry mass versus control.
  compared with the control
- no effect
  Supplemental UV-A left shoot fresh mass, leaf area and leaf number unaffected in both lettuce varieties.
cites 1 paper herecited by 1 paper here
Effects of Ultraviolet-B Radiation on the Regulation of Ascorbic Acid Accumulation and Metabolism in Lettuce · 2023
- no effect
  UV-B did not significantly decrease lettuce shoot fresh or dry weight.
cites 1 paper herecited by 1 paper here
Influence of R/FR ratio on response of maize, lettuce, and Amaranthus retroflexus L. to UV‐B radiation · 2023
- negative
  UV-B inhibited plant growth and allometric parameters.
End-of-production Ultraviolet A and Blue Light Similarly Increase Lettuce Coloration and Phytochemical Concentrations · 2023
- no effect
  UVA and blue light did not inhibit lettuce growth compared with no supplemental lighting.
  compared with lettuce grown without EOP supplemental lighting
cited by 1 paper here
Ultraviolet A and Blue Light Transiently Regulate Total Phenolic and Anthocyanin Concentrations in Indoor-grown Red-leaf Lettuce · 2023
- no effect
  Single-phase UVA supplementation did not inhibit lettuce biomass accumulation.
cites 4 papers here
Destructive effect of UV-C light radiation on lettuce growth: risk assessment of long time exposure · 2024
- negative
  Two hours of UV-C exposure had the most damaging effect on lettuce morphology.
cites 1 paper here
Effects of UV-B and UV-C Spectrum Supplementation on the Antioxidant Properties and Photosynthetic Activity of Lettuce Cultivars · 2024
- negative
  UV-C limited growth of the green leaf cultivar.
cites 2 papers here

A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.

uv · Growth · Lactuca sativa (garden lettuce)

Papers whose results differ, checked claim by claim 3

How these papers cite each other

Papers reporting a positive result 15

Papers reporting a negative result or no effect 20

uv on Lactuca sativa (garden lettuce) against other targets

uv · growth on other organisms