Abstract
Low activity of oxygen radical generation in leaves during and after chilling is implicated in the high chilling tolerance of cucumber (Cucumis sativus L.) cultivars (Shen et al., 1999). In this study, the activity or content of enzymic and nonenzymic antioxidants in leaves were compared between chilling-tolerant 'Jinchun No.3' and chilling-sensitive 'Suyo', during a 24-hr chilling period at 3°C in the dark and subsequent 24 hr at 28/22°C (day/night) under a 12 hr-photoperiod (rewarming). During chilling, activities of catalase (CAT) decreased, while those of superoxide dismutase (SOD), guaiacol peroxidase (POX) and ascorbate peroxidase (APX) were equal to those in control leaves exposed to 15°C in the dark for 24 hr in both cultivars. Ascorbic acid (AsA), dehydroascorbic acid (DHA), and reduced glutathione (GSH) increased during chilling in 'Jinchun No.3' but not in 'Suyo'. During rewarming, however, most antioxidant enzymes increased in their activities in chilled leaves. SOD activity increased more greatly in 'Jinchun No.3' than it did in 'Suyo'. APX activity also increased greatly in 'Jinchun No.3' but it did not increase in 'Suyo'. The increases in CAT and POX activities were similar in the two cultivars. AsA, GSH, and oxidized glutathione (GSSG) also increased during rewarming in 'Jinchun No.3' leaves, whereas in 'Suyo' leaves, DHA increased during early rewarming, but GSH and GSSG did so only toward the end of the rewarming period. The results are discussed in relation to the difference in chilling tolerance between the two cucumber cultivars.
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Claims 12
Claim · model-written summary
Catalase activity decreased during chilling in both cucumber cultivars.
- Taxon
- cucumber (Cucumis sativus L.)
Cucumis sativuse1 - Treatment
- chillinge0
- Outcome
- activities of catalase (CAT)e0
- Direction
- decreasede0
- Comparator
- control leaves exposed to 15°C in the dark for 24 hre0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During chilling, activities of catalase (CAT) decreased, while those of superoxide dismutase (SOD), guaiacol peroxidase (POX) and ascorbate peroxidase (APX) were equal to those in control leaves exposed to 15°C in the dark for 24 hr in both cultivars.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
SOD, POX, and APX activities during chilling equalled control leaves in both cultivars.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- chillinge0
- Outcome
- superoxide dismutase (SOD), guaiacol peroxidase (POX) and ascorbate peroxidase (APX)e0
- Direction
- equale0
- Comparator
- control leaves exposed to 15°C in the dark for 24 hre0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During chilling, activities of catalase (CAT) decreased, while those of superoxide dismutase (SOD), guaiacol peroxidase (POX) and ascorbate peroxidase (APX) were equal to those in control leaves exposed to 15°C in the dark for 24 hr in both cultivars.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
AsA, DHA, and GSH increased during chilling in Jinchun No.3.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Jinchun No.3'e0
- Treatment
- chillinge0
- Outcome
- Ascorbic acid (AsA), dehydroascorbic acid (DHA), and reduced glutathione (GSH)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ascorbic acid (AsA), dehydroascorbic acid (DHA), and reduced glutathione (GSH) increased during chilling in 'Jinchun No.3' but not in 'Suyo'.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
AsA, DHA, and GSH did not increase during chilling in Suyo.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Suyo'e0
- Treatment
- chillinge0
- Outcome
- Ascorbic acid (AsA), dehydroascorbic acid (DHA), and reduced glutathione (GSH)e0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ascorbic acid (AsA), dehydroascorbic acid (DHA), and reduced glutathione (GSH) increased during chilling in 'Jinchun No.3' but not in 'Suyo'.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
Most antioxidant enzyme activities increased in chilled leaves during rewarming.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- rewarminge0
- Outcome
- most antioxidant enzymese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During rewarming, however, most antioxidant enzymes increased in their activities in chilled leaves.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
SOD activity increased more in Jinchun No.3 than Suyo during rewarming.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Jinchun No.3'e0
- Outcome
- SOD activitye0
- Direction
- increased more greatlye0
- Comparator
- 'Suyo'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD activity increased more greatly in 'Jinchun No.3' than it did in 'Suyo'.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
APX activity increased in Jinchun No.3 during rewarming.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Jinchun No.3'e0
- Outcome
- APX activitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APX activity also increased greatly in 'Jinchun No.3' but it did not increase in 'Suyo'.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
APX activity did not increase in Suyo during rewarming.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Suyo'e0
- Outcome
- APX activitye0
- Direction
- did not increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APX activity also increased greatly in 'Jinchun No.3' but it did not increase in 'Suyo'.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
CAT and POX activity increases were similar in the two cultivars during rewarming.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Outcome
- CAT and POX activitiese0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases in CAT and POX activities were similar in the two cultivars.”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
AsA, GSH, and GSSG increased during rewarming in Jinchun No.3 leaves.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Jinchun No.3'e0
- Outcome
- AsA, GSH, and oxidized glutathione (GSSG)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AsA, GSH, and oxidized glutathione (GSSG) also increased during rewarming in 'Jinchun No.3' leaves”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
DHA increased during early rewarming in Suyo leaves.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Suyo'e0
- Outcome
- DHAe0
- Direction
- increasede0
- Qualifier
- early rewarminge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 'Suyo' leaves, DHA increased during early rewarming, but GSH and GSSG did so only toward the end of the rewarming period”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
GSH and GSSG increased only late in rewarming in Suyo leaves.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse1
- Material
- 'Suyo'e0
- Outcome
- GSH and GSSGe0
- Direction
- increaseinferrede0
- Qualifier
- toward the end of the rewarming periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 'Suyo' leaves, DHA increased during early rewarming, but GSH and GSSG did so only toward the end of the rewarming period”
e1“cucumber (Cucumis sativus L.)”
The same questions in other papers
cold · physiology: antioxidant enzymes · Cucumis sativus (cucumber)Results differ
5 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- no effect
15 papers more in this group
See all 19 papers →cold · quality: phytochemicals · Cucumis sativus (cucumber)Results agree
1 paper in the same direction as this paper
- 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.