Abstract
Cucumber (Cucumis sativus L.) cv. Xintaimici (a chilling-resistant cultivar) and cv. Jinyan no. 4 (a chilling-sensitive cultivar) were subjected to two temperatures (15/15 and 25/18 degrees C) under low light (100 mumol m(-2) s(-1)) to understand the relationship between ultrastructural changes and the antioxidant abilities caused by low temperature (15/15 degrees C). We also aimed to find indicators for chilling resistance that could be used on a routine basis in breeding programs of greenhouse crops. At the 15/15 degrees C treatment, the membranes of chloroplast, mitochondrion, ER and plasma were not significantly changed in Xintaimici, whereas they were seriously affected in Jinyan no. 4. This result was consistent with the changes of malonaldehyde in chilling-stressed cucumber leaves. The antioxidant activities were changed under low temperature according to cultivar-expected resistance, relating in part to the described ultrastructural changes. The activities of superoxide dismutase (EC 1.15.1.1) and guaiacol peroxidase (EC 1.11.1.7) increased in chilling-stressed leaves of both cultivars, but the two enzymes were not responsible for the difference between cucumber cultivars. At 15/15 degrees C, contents of GSH and activities of glutathione reductase (GR, EC 1.6.4.2) increased more in leaves of Xintaimici than in those of Jinyan no. 4, while catalase (CAT, EC 1.11.1.6) activities decreased less. GSH, GR and CAT were affected by low temperature and cultivars and correlated with the difference in ultrastructure between chilling-stressed cucumber cultivars. We propose that the three antioxidants might be therefore used as biochemical indicators to screen chilling-resistant cucumber cultivars.
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Claims 8
Claim · model-written summary
Chilling left Xintaimici leaf membranes largely unchanged but seriously affected Jinyan no. 4.
- Taxon
- Cucumber
Cucumis sativuse1 - Material
- Xintaimicie0
- Treatment
- 15/15 degrees C treatmente0
- Outcome
- membranes of chloroplast, mitochondrion, ER and plasmae0
- Direction
- not significantly changede0
- Comparator
- Jinyan no. 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the 15/15 degrees C treatment, the membranes of chloroplast, mitochondrion, ER and plasma were not significantly changed in Xintaimici, whereas they were seriously affected in Jinyan no. 4”
e1“Cucumber (Cucumis sativus L.)”
Claim · model-written summary
Chilling affected malonaldehyde in cucumber leaves consistently with membrane changes.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- chilling-stressede0
- Outcome
- changes of malonaldehydee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This result was consistent with the changes of malonaldehyde in chilling-stressed cucumber leaves”
Claim · model-written summary
Chilling changed antioxidant activity according to cultivar resistance.
- Taxon
- CucumberCucumis sativuse1
- Treatment
- low temperaturee0
- Outcome
- antioxidant activitiese0
- Direction
- changede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antioxidant activities were changed under low temperature according to cultivar-expected resistance, relating in part to the described ultrastructural changes”
e1“Cucumber (Cucumis sativus L.)”
Claim · model-written summary
Superoxide dismutase and guaiacol peroxidase activities increased under chilling in both cultivars.
- Taxon
- CucumberCucumis sativuse1
- Treatment
- chilling-stressede0
- Gene
- superoxide dismutasee0
- Outcome
- activities of superoxide dismutase (EC 1.15.1.1) and guaiacol peroxidase (EC 1.11.1.7)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of superoxide dismutase (EC 1.15.1.1) and guaiacol peroxidase (EC 1.11.1.7) increased in chilling-stressed leaves of both cultivars”
e1“Cucumber (Cucumis sativus L.)”
Claim · model-written summary
GSH and glutathione reductase rose more in Xintaimici leaves than Jinyan no. 4 under chilling.
- Taxon
- CucumberCucumis sativuse1
- Material
- Xintaimicie0
- Treatment
- 15/15 degrees Ce0
- Outcome
- contents of GSH and activities of glutathione reductase (GR, EC 1.6.4.2)e0
- Direction
- increased moree0
- Comparator
- Jinyan no. 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 15/15 degrees C, contents of GSH and activities of glutathione reductase (GR, EC 1.6.4.2) increased more in leaves of Xintaimici than in those of Jinyan no. 4”
e1“Cucumber (Cucumis sativus L.)”
Claim · model-written summary
Catalase activity decreased less in Xintaimici than Jinyan no. 4.
- Taxon
- CucumberCucumis sativuse2
- Material
- Xintaimicie1
- Gene
- catalase (CAT, EC 1.11.1.6)e0
- Outcome
- catalase (CAT, EC 1.11.1.6) activitiese0
- Direction
- decreased lesse0
- Comparator
- Jinyan no. 4e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while catalase (CAT, EC 1.11.1.6) activities decreased less”
e1“leaves of Xintaimici than in those of Jinyan no. 4”
e2“Cucumber (Cucumis sativus L.)”
Claim · model-written summary
GSH, GR, and CAT correlated with cultivar differences in chilling-related ultrastructure.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- low temperaturee0
- Gene
- GR and CATe0
- Outcome
- difference in ultrastructuree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GSH, GR and CAT were affected by low temperature and cultivars and correlated with the difference in ultrastructure between chilling-stressed cucumber cultivars”
Claim · model-written summary
The authors propose GSH, GR, and CAT as indicators for screening chilling-resistant cucumber cultivars.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- biochemical indicators to screen chilling-resistant cucumber cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the three antioxidants might be therefore used as biochemical indicators to screen chilling-resistant cucumber cultivars”
The same questions in other papers
cold · physiology: antioxidant enzymes · Cucumis sativus (cucumber)Results differ
12 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- negative
15 papers more in this group
See all 19 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.