Abstract
• UV-B elicits intensity-dependent responses in Raphanus sativus • Low UV-B enhances antioxidant capacity and physiological performance • High UV-B increases ROS accumulation and lipid peroxidation • Antioxidant–growth balance shifts under elevated UV-B • Clear transition from acclimation to oxidative stress identified Ultraviolet-B (UV-B) radiation is a key abiotic stressor that alters plant growth and induces oxidative imbalance. However, the interactive effects of UV-B intensity and exposure duration on antioxidant regulation and morphophysiological performance in Raphanus sativus L. remain mechanistically unresolved in an intensity-dependent context. This study investigated how two UV-B intensities (0.2 and 10 µW cm⁻²) and exposure durations (6 and 12 h) modulate antioxidant systems, gene expression, and physiological performance in R. sativus L. Low UV-B induced moderate increases in antioxidant enzyme activities and gene expression with only minor reductions in photosynthetic parameters, indicating an acclimatory response. In contrast, high UV-B triggered strong upregulation of SOD, POD, CAT, GPX, and GST activities, accompanied by significant oxidative stress, reflected by elevated H₂O₂ and MDA accumulation. Under high UV-B (12 h), chlorophyll content, net photosynthesis, and transpiration rate declined by approximately 75%, 63%, and 69%, respectively, compared with control plants. These physiological impairments were associated with reduced growth traits, suggesting a shift from redox signaling to oxidative damage and defense–growth trade-offs. Multivariate correlation analysis further revealed intensity-dependent restructuring of antioxidant–growth coordination, distinguishing adaptive redox signaling at low UV-B from growth-inhibitory oxidative pressure at high UV-B. Collectively, the results identify a physiological threshold separating adaptive acclimation from stress-induced dysfunction and highlight inducible antioxidant capacity as a key determinant of UV-B resilience in radish.
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Claims 9
Claim · model-written summary
Low UV-B moderately increased radish antioxidant enzyme activities and gene expression.
- Taxon
- Raphanus sativus
Raphanus sativust0 - Treatment
- Low UV-Be0
- Outcome
- antioxidant enzyme activities and gene expressione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low UV-B induced moderate increases in antioxidant enzyme activities and gene expression with only minor reductions in photosynthetic parameters”
t0“Raphanus sativus L”
Claim · model-written summary
Low UV-B caused minor reductions in radish photosynthetic parameters.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- Low UV-Be0
- Outcome
- photosynthetic parameterse0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low UV-B induced moderate increases in antioxidant enzyme activities and gene expression with only minor reductions in photosynthetic parameters”
t0“Raphanus sativus L”
Claim · model-written summary
High UV-B strongly upregulated radish SOD, POD, CAT, GPX, and GST activities.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- high UV-Be0
- Outcome
- SOD, POD, CAT, GPX, and GST activitiese0
- Direction
- upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high UV-B triggered strong upregulation of SOD, POD, CAT, GPX, and GST activities”
t0“Raphanus sativus L”
Claim · model-written summary
High UV-B elevated radish H₂O₂ and MDA accumulation.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- high UV-Be0
- Outcome
- H₂O₂ and MDA accumulatione0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high UV-B triggered strong upregulation of SOD, POD, CAT, GPX, and GST activities, accompanied by significant oxidative stress, reflected by elevated H₂O₂ and MDA accumulation.”
t0“Raphanus sativus L”
Claim · model-written summary
After 12 h of high UV-B, radish chlorophyll content declined approximately 75% from controls.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- high UV-B (12 h)e0
- Outcome
- chlorophyll contente0
- Direction
- declinede0
- Value
- 75%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high UV-B (12 h), chlorophyll content, net photosynthesis, and transpiration rate declined by approximately 75%, 63%, and 69%, respectively, compared with control plants.”
t0“Raphanus sativus L”
Claim · model-written summary
After 12 h of high UV-B, radish net photosynthesis declined approximately 63% from controls.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- high UV-B (12 h)e0
- Outcome
- net photosynthesise0
- Direction
- declinede0
- Value
- 63%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high UV-B (12 h), chlorophyll content, net photosynthesis, and transpiration rate declined by approximately 75%, 63%, and 69%, respectively, compared with control plants.”
t0“Raphanus sativus L”
Claim · model-written summary
After 12 h of high UV-B, radish transpiration declined approximately 69% from controls.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- high UV-B (12 h)e0
- Outcome
- transpiration ratee0
- Direction
- declinede0
- Value
- 69%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high UV-B (12 h), chlorophyll content, net photosynthesis, and transpiration rate declined by approximately 75%, 63%, and 69%, respectively, compared with control plants.”
t0“Raphanus sativus L”
Claim · model-written summary
Radish physiological impairment under high UV-B was associated with reduced growth traits.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- physiological impairmentse0
- Outcome
- growth traitse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These physiological impairments were associated with reduced growth traits”
t0“Raphanus sativus L”
Claim · model-written summary
Antioxidant–growth coordination differed with UV-B intensity.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- intensity-dependente0
- Outcome
- antioxidant–growth coordinatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Multivariate correlation analysis further revealed intensity-dependent restructuring of antioxidant–growth coordination”
t0“Raphanus sativus L”
The same questions in other papers
uv · physiology: photosynthesis · Raphanus sativus (radish)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
uv · physiology: pigments · Raphanus sativus (radish)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- no effect
uv · physiology: oxidative · Raphanus sativus (radish)Results agree
1 paper in the same direction as this paper
- negative
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.