Abstract
This study aims to evaluate the effect of solar UV radiation on defensive enzymes activities in lettuce seedlings. Seeds of lettuce were grown in high tunnels for 35 days, exposed to three different levels of solar UV, created by using three different types of plastic films. Each plastic film transmits different levels of solar UV (0% in UV-B, 4% in UV-L and 83% in UV-T). The obtained results indicated that solar UV radiation has led to significant decrease in seedling fresh weight. UV-B treatment resulted the highest shoot and root length while UV-T treatments exhibited the highest shoot: root ratio. Solar UV radiations have no effect on peroxidase activity in shoots. While ascorbate peroxidase was activated and catalase was inhibited in shoot by UV-T treatments. In lettuce roots, peroxidase, ascorbate peroxidase, and catalase activities were increased by increasing the level of solar UV radiation. In case of UV-T, phenylalanine ammonia lyase (PAL) activity in both shoots and roots of lettuce seedlings was higher than those of other treatments. In addition, Phenols are accumulated in lettuce shoots as a result of UV radiation in UV-L and UV-T treatments. Also, phenols in roots increased by increasing solar UV dose. The study concluded that solar UV radiation induced some antioxidant enzymes, increased the accumulation and biosynthesis of phenolic compounds and reduced lettuce seedlings growth.
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Claims 10
Claim · model-written summary
Solar UV radiation significantly decreased lettuce seedling fresh weight.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- solar UV radiatione1
- Outcome
- seedling fresh weighte1
- Direction
- decreasee1
- Setting
- high tunnelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e1“solar UV radiation has led to significant decrease in seedling fresh weight”
Claim · model-written summary
UV-B treatment gave the highest lettuce shoot and root length.
- Taxon
- lettuceLactuca sativae0
- Treatment
- UV-B treatmente2
- Outcome
- shoot and root lengthe2
- Direction
- higheste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e2“UV-B treatment resulted the highest shoot and root length”
Claim · model-written summary
UV-T treatments gave the highest lettuce shoot:root ratio.
- Taxon
- lettuceLactuca sativae0
- Treatment
- UV-T treatmentse3
- Outcome
- shoot: root ratioe3
- Direction
- higheste3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e3“UV-T treatments exhibited the highest shoot: root ratio”
Claim · model-written summary
Solar UV radiation had no effect on peroxidase activity in lettuce shoots.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- shootse4
- Treatment
- Solar UV radiationse4
- Outcome
- peroxidase activitye4
- Direction
- no effecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e4“Solar UV radiations have no effect on peroxidase activity in shoots”
Claim · model-written summary
UV-T treatments activated ascorbate peroxidase in lettuce shoots.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- shoote5
- Treatment
- UV-T treatmentse5
- Outcome
- ascorbate peroxidasee5
- Direction
- activatede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e5“While ascorbate peroxidase was activated and catalase was inhibited in shoot by UV-T treatments”
Claim · model-written summary
UV-T treatments inhibited catalase in lettuce shoots.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- shoote5
- Treatment
- UV-T treatmentse5
- Outcome
- catalasee5
- Direction
- inhibitede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e5“While ascorbate peroxidase was activated and catalase was inhibited in shoot by UV-T treatments”
Claim · model-written summary
Increasing solar UV radiation increased peroxidase, ascorbate peroxidase and catalase activities in lettuce roots.
- Taxon
- lettuceLactuca sativae6
- Organ / stage
- rootse6
- Treatment
- increasing the level of solar UV radiatione6
- Outcome
- peroxidase, ascorbate peroxidase, and catalase activitiese6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“In lettuce roots, peroxidase, ascorbate peroxidase, and catalase activities were increased by increasing the level of solar UV radiation”
Claim · model-written summary
UV-T treatment raised phenylalanine ammonia lyase (PAL) activity in lettuce shoots and roots above that of other treatments.
- Taxon
- lettuceLactuca sativae7
- Organ / stage
- shoots and rootse7
- Treatment
- UV-Te7
- Outcome
- phenylalanine ammonia lyase (PAL) activitye7
- Direction
- highere7
- Comparator
- other treatmentse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“In case of UV-T, phenylalanine ammonia lyase (PAL) activity in both shoots and roots of lettuce seedlings was higher than those of other treatments”
Claim · model-written summary
UV radiation in UV-L and UV-T treatments caused phenols to accumulate in lettuce shoots.
- Taxon
- lettuceLactuca sativae1
- Organ / stage
- shootse1
- Treatment
- UV radiation in UV-L and UV-T treatmentse1
- Outcome
- Phenolse1
- Direction
- accumulatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Phenols are accumulated in lettuce shoots as a result of UV radiation in UV-L and UV-T treatments”
Claim · model-written summary
Increasing solar UV dose increased phenols in lettuce roots.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- rootse1
- Treatment
- increasing solar UV dosee1
- Outcome
- phenolse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of lettuce were grown in high tunnels for 35 days”
e1“phenols in roots increased by increasing solar UV dose”
The same questions in other papers
uv · growth · Lactuca sativa (garden lettuce)Results differ
14 papers in the same direction as this paper · 20 in the opposite direction
- positive
- no effect
- negative
31 papers more in this group
See all 35 papers →uv · physiology: antioxidant enzymes · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.