Abstract
Reduced nitrogen availability is an efficient strategy for increasing the accumulation of phenolic compounds in vegetables, but related mechanisms remain unknown. Here, the production of hydrogen peroxide (H2O2) and its potential roles in regulating phenolic biosynthesis and enhancing the antioxidant quality of lettuce under low nitrogen (LN) conditions were investigated. The LN treatment caused a rapid production of H2O2, which effectively increased lettuce quality by enhancing the levels of phenolic compounds and other nutrients such as ascorbic acid, glutathione, soluble sugar, and soluble protein. The increased phenolic content was related to the higher expression levels of phenolic biosynthesis genes, including PAL, CHS, DFR, F35H, and UFGT, and higher photosynthetic capacity after H2O2 addition under LN conditions. However, these positive effects were suppressed by dimethylthiourea (DMTU), a scavenger of H2O2. These results suggest that H2O2 as an important signal molecular mediates the LN-caused phenolic accumulation and antioxidant quality enhancement in lettuce.
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Claims 7
Claim · model-written summary
Low nitrogen rapidly increased hydrogen peroxide production in lettuce.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- LN treatmente0
- Outcome
- production of H2O2e0
- Direction
- rapide0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LN treatment caused a rapid production of H2O2”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
Claim · model-written summary
Low nitrogen increased lettuce phenolic compounds.
- Taxon
- lettuceLactuca sativae0
- Treatment
- LN treatmente0
- Outcome
- levels of phenolic compoundse0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LN treatment caused a rapid production of H2O2, which effectively increased lettuce quality by enhancing the levels of phenolic compounds and other nutrients such as ascorbic acid, glutathione, soluble sugar, and soluble protein”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
Claim · model-written summary
Low nitrogen increased lettuce ascorbic acid, glutathione, soluble sugar and soluble protein levels.
- Taxon
- lettuceLactuca sativae0
- Treatment
- LN treatmente0
- Outcome
- ascorbic acid, glutathione, soluble sugar, and soluble proteine0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LN treatment caused a rapid production of H2O2, which effectively increased lettuce quality by enhancing the levels of phenolic compounds and other nutrients such as ascorbic acid, glutathione, soluble sugar, and soluble protein”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
Claim · model-written summary
Hydrogen peroxide addition increased expression of phenolic biosynthesis genes under low nitrogen.
- Taxon
- lettuceLactuca sativat0
- Treatment
- H2O2 additione0
- Gene
- PAL, CHS, DFR, F35H, and UFGTe0
- Outcome
- expression levels of phenolic biosynthesis genese0
- Direction
- highere0
- Qualifier
- under LN conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher expression levels of phenolic biosynthesis genes, including PAL, CHS, DFR, F35H, and UFGT, and higher photosynthetic capacity after H2O2 addition under LN conditions”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
Claim · model-written summary
Hydrogen peroxide addition increased photosynthetic capacity under low nitrogen.
- Taxon
- lettuceLactuca sativat0
- Treatment
- H2O2 additione0
- Outcome
- photosynthetic capacitye0
- Direction
- highere0
- Qualifier
- under LN conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher expression levels of phenolic biosynthesis genes, including PAL, CHS, DFR, F35H, and UFGT, and higher photosynthetic capacity after H2O2 addition under LN conditions”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
Claim · model-written summary
DMTU suppressed the positive effects of hydrogen peroxide under low nitrogen.
- Taxon
- lettuceLactuca sativat0
- Treatment
- dimethylthiourea (DMTU)e0
- Outcome
- positive effectse0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these positive effects were suppressed by dimethylthiourea (DMTU), a scavenger of H2O2”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
Claim · model-written summary
The authors inferred that H2O2 mediates phenolic accumulation and antioxidant quality enhancement under low nitrogen.
- Taxon
- lettuceLactuca sativae0
- Compound
- H2O2e0
- Outcome
- phenolic accumulation and antioxidant quality enhancemente0
- Qualifier
- LN-causede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 as an important signal molecular mediates the LN-caused phenolic accumulation and antioxidant quality enhancement in lettuce”
t0“Hydrogen peroxide regulates the biosynthesis of phenolic compounds and antioxidant quality enhancement in lettuce under low nitrogen condition”
The same questions in other papers
hydrogen peroxide · physiology: photosynthesis · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
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nitrogen · physiology: osmolytes · Lactuca sativa (garden lettuce)Positive and negative results
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See all 5 papers →nitrogen · quality: phytochemicals · Lactuca sativa (garden lettuce)Positive and negative results
9 papers in the same direction as this paper · 6 in the opposite direction
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See all 16 papers →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.