Abstract
A process-based model integrating the effects of UV-B radiation through epidermis, cellular DNA, and its consequences to the leaf expansion was developed from key parameters in the published literature. Enhanced UV-B radiation-induced DNA damage significantly delayed cell division, resulting in significant reductions in leaf growth and development. Ambient UV-B radiation-induced DNA damage significantly reduced the leaf growth of species with high relative epidermal absorbance at longer wavelengths and average/low pyrimidine cyclobutane dimers (CPD) photorepair rates. Leaf expansion was highly dependent on the number of CPD present in the DNA, as a result of UV-B radiation dose, quantitative and qualitative absorptive properties of epidermal pigments, and repair mechanisms. Formation of pyrimidine-pyrimidone (6-4) photoproducts (6-4PP) has no effect on the leaf expansion. Repair mechanisms could not solely prevent the UV-B radiation interference with the cell division. Avoidance or effective shielding by increased or modified qualitative epidermal absorptance was required. Sustained increased UV-B radiation levels are more detrimental than short, high doses of UV-B radiation. The combination of low temperature and increased UV-B radiation was more significant in the level of UV-B radiation-induced damage than UV-B radiation alone. Slow-growing leaves were more affected by increased UV-B radiation than fast-growing leaves.
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Claims 11
Claim · model-written summary
A process-based model integrated UV-B effects from epidermis and DNA to leaf expansion.
Not reportedComparatorValue
Verbatim
e0“A process-based model integrating the effects of UV-B radiation through epidermis, cellular DNA, and its consequences to the leaf expansion was developed from key parameters in the published literature.”
Claim · model-written summary
Enhanced UV-B DNA damage significantly delayed cell division.
- Taxon
- plantsViridiplantaet0
- Treatment
- Enhanced UV-B radiatione0
- Outcome
- cell divisione0
- Direction
- delayede0
Not reportedComparator
Verbatim
e0“Enhanced UV-B radiation-induced DNA damage significantly delayed cell division”
t0“effects on plants”
Claim · model-written summary
Enhanced UV-B DNA damage significantly reduced leaf growth and development.
- Taxon
- plantsViridiplantaet0
- Treatment
- Enhanced UV-B radiatione1
- Outcome
- leaf growth and developmente0
- Direction
- reductionse0
Not reportedComparator
Verbatim
e0“resulting in significant reductions in leaf growth and development”
e1“Enhanced UV-B radiation-induced DNA damage”
t0“effects on plants”
Claim · model-written summary
Ambient UV-B DNA damage significantly reduced leaf growth in species with high long-wavelength epidermal absorbance and average or low CPD repair.
- Taxon
- speciese0
- Treatment
- Ambient UV-B radiatione0
- Outcome
- leaf growthe0
- Direction
- reducede0
- Qualifier
- high relative epidermal absorbance at longer wavelengths and average/low pyrimidine cyclobutane dimers (CPD) photorepair ratese0
Not reportedComparator
Verbatim
e0“Ambient UV-B radiation-induced DNA damage significantly reduced the leaf growth of species with high relative epidermal absorbance at longer wavelengths and average/low pyrimidine cyclobutane dimers (CPD) photorepair rates.”
Claim · model-written summary
Leaf expansion depended strongly on CPD number, UV-B dose, epidermal pigments and repair.
- Taxon
- plantsViridiplantaet0
- Treatment
- UV-B radiation dosee0
- Outcome
- Leaf expansione0
- Qualifier
- number of CPD present in the DNAe0
Not reportedDirection
Verbatim
e0“Leaf expansion was highly dependent on the number of CPD present in the DNA, as a result of UV-B radiation dose, quantitative and qualitative absorptive properties of epidermal pigments, and repair mechanisms.”
t0“effects on plants”
Claim · model-written summary
6-4PP formation had no effect on leaf expansion.
- Taxon
- plantsViridiplantaet0
- Outcome
- leaf expansione0
- Direction
- no effecte0
- Qualifier
- pyrimidine-pyrimidone (6-4) photoproducts (6-4PP)e0
Verbatim
e0“Formation of pyrimidine-pyrimidone (6-4) photoproducts (6-4PP) has no effect on the leaf expansion.”
t0“effects on plants”
Claim · model-written summary
Repair mechanisms alone could not prevent UV-B interference with cell division.
- Taxon
- plantsViridiplantaet0
- Outcome
- UV-B radiation interference with the cell divisione0
Verbatim
e0“Repair mechanisms could not solely prevent the UV-B radiation interference with the cell division.”
t0“effects on plants”
Claim · model-written summary
Increased or modified epidermal absorptance was required for avoidance or shielding.
- Taxon
- plantsViridiplantaet0
- Outcome
- Avoidance or effective shieldinge0
- Qualifier
- increased or modified qualitative epidermal absorptancee0
Verbatim
e0“Avoidance or effective shielding by increased or modified qualitative epidermal absorptance was required.”
t0“effects on plants”
Claim · model-written summary
Sustained increased UV-B levels were more detrimental than short high doses.
Verbatim
e0“Sustained increased UV-B radiation levels are more detrimental than short, high doses of UV-B radiation.”
t0“effects on plants”
Claim · model-written summary
Low temperature with elevated UV-B caused more UV-B damage than UV-B alone.
Verbatim
e0“The combination of low temperature and increased UV-B radiation was more significant in the level of UV-B radiation-induced damage than UV-B radiation alone.”
t0“effects on plants”
Claim · model-written summary
Slow-growing leaves were more affected by increased UV-B than fast-growing leaves.
Verbatim
e0“Slow-growing leaves were more affected by increased UV-B radiation than fast-growing leaves.”
t0“effects on plants”
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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.