Abstract
Low temperatures constitute a major risk for the production of citrus fruit because citrus plants are sensitive to low temperatures and harvesting coincides with winter. The production of reactive oxygen species (ROS) is a biochemical change in plants facing cold stress. Plants may increase levels of antioxidants as an adaptation for preventing oxidative stress. In this study, three citrus cultivars (Citrus unshiu , Citrus sinensis and Citrus lemon ) were examined to compare the activities of three antioxidants: ascorbate peroxidase (APX), peroxidase (POD) and superoxide dismutase (SOD), in the flavedo tissue of unripe and ripened fruits. Enzyme activity levels were examined under various cold temperature treatments (range: 3, 0, -3 and -6°C) and a control (15°C). The results indicate that SOD activity was highest in all three cultivars under cold treatments. Unripe and ripened Citrus unshiu fruits had the maximum level of APX enzyme activity in the cold treatments. Similarly, the activity of POD enzyme in Citrus unshiu fruits significantly increased during temperature reductions. Overall, Citrus unshiu appears the most resistant to cold treatments compared with the other two cultivars.
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Claims 4
Claim · model-written summary
SOD activity was highest in all three citrus cultivars under cold treatments.
- Material
- Citrus unshiu , Citrus sinensis and Citrus lemone6
- Organ / stage
- flavedo tissue of unripe and ripened fruitse0
- Treatment
- cold treatmentse2
- Outcome
- SOD activitye2
- Direction
- higheste2
- Comparator
- a control (15°C)e1
CitrusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cultivars of citrus fruit”
e0“in the flavedo tissue of unripe and ripened fruits”
e1“Enzyme activity levels were examined under various cold temperature treatments (range: 3, 0, -3 and -6°C) and a control (15°C)”
e2“The results indicate that SOD activity was highest in all three cultivars under cold treatments”
e6“three citrus cultivars (Citrus unshiu , Citrus sinensis and Citrus lemon )”
Claim · model-written summary
The APX activity of Citrus unshiu fruits reached its maximum under cold treatments.
- Taxon
- Citrus unshiu
Citrus unshiue3 - Material
- Citrus unshiue3
- Organ / stage
- Unripe and ripened Citrus unshiu fruitse3
- Treatment
- cold treatmentse3
- Outcome
- APX enzyme activitye3
- Direction
- maximume3
- Comparator
- a control (15°C)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Enzyme activity levels were examined under various cold temperature treatments (range: 3, 0, -3 and -6°C) and a control (15°C)”
e3“Unripe and ripened Citrus unshiu fruits had the maximum level of APX enzyme activity in the cold treatments”
Claim · model-written summary
POD activity in Citrus unshiu fruits increased significantly during temperature reductions.
- Taxon
- Citrus unshiuCitrus unshiue4
- Treatment
- temperature reductionse4
- Outcome
- the activity of POD enzymee4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Similarly, the activity of POD enzyme in Citrus unshiu fruits significantly increased during temperature reductions”
Claim · model-written summary
Citrus unshiu was the most cold resistant of the three cultivars.
- Taxon
- Citrus unshiuCitrus unshiue5
- Treatment
- cold treatmentse5
- Outcome
- most resistante5
- Comparator
- the other two cultivarse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Citrus unshiu appears the most resistant to cold treatments compared with the other two cultivars”
The same questions in other papers
cold · physiology: antioxidant enzymes · CitrusResults agree
2 papers in the same direction as this paper
- positive
- positive
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.