Abstract
The effects of simulated acid rain on gas exchange, chlorophyll fluorescence, and anti-oxidative enzyme activity in cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4) were investigated. Acid rain significantly reduced net photosynthetic rate and mainly non-stomatal factors contributed to the decrease of photosynthesis during the experimental period. The reduced photosynthesis was associated with a decreased maximal photochemical efficiency (Fv/Fm) and the average quantum yield of the photosystem 2 (PS2) reaction centres (ΦPS2). Meanwhile, acid rain significantly increased the activities of guaiacol peroxidase (GPX) and superoxide dismutase (SOD), but decreased the activity of catalase (CAT) together with an increased content of malonyldialdehyde (MDA), Hence the changes in photosynthesis in acid rain treatment might be a secondary effect of acidity damage probably due to lipid peroxidation of lipids and proteins in thylakoid membrane rather than direct effect on PS2 reaction centre.
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Claims 7
Claim · model-written summary
Simulated acid rain significantly reduced net photosynthetic rate in cucumber seedlings.
- Taxon
- cucumber
Cucumis sativuse0 - Material
- Jingchun No. 4e0
- Organ / stage
- seedlingse0
- Treatment
- Acid raine1
- Outcome
- net photosynthetic ratee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“Acid rain significantly reduced net photosynthetic rate”
Claim · model-written summary
Mainly non-stomatal factors contributed to the decrease of photosynthesis under acid rain in cucumber during the experimental period.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- decrease of photosynthesise1
- Qualifier
- non-stomatal factorse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“mainly non-stomatal factors contributed to the decrease of photosynthesis during the experimental period”
Claim · model-written summary
Under acid rain the maximal photochemical efficiency (Fv/Fm) and the quantum yield of PS2 reaction centres (ΦPS2) decreased in cucumber, associated with the reduced photosynthesis.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Acid raine2
- Outcome
- maximal photochemical efficiency (Fv/Fm)e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“The reduced photosynthesis was associated with a decreased maximal photochemical efficiency (Fv/Fm) and the average quantum yield of the photosystem 2 (PS2) reaction centres (ΦPS2)”
e2“Acid rain”
Claim · model-written summary
Acid rain significantly increased the activities of guaiacol peroxidase (GPX) and superoxide dismutase (SOD) in cucumber seedlings.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- acid raine1
- Outcome
- activities of guaiacol peroxidase (GPX) and superoxide dismutase (SOD)e1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“acid rain significantly increased the activities of guaiacol peroxidase (GPX) and superoxide dismutase (SOD), but decreased the activity of catalase (CAT) together with an increased content of malonyldialdehyde (MDA)”
Claim · model-written summary
Acid rain decreased the activity of catalase (CAT) in cucumber seedlings.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- acid raine1
- Outcome
- activity of catalase (CAT)e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“acid rain significantly increased the activities of guaiacol peroxidase (GPX) and superoxide dismutase (SOD), but decreased the activity of catalase (CAT) together with an increased content of malonyldialdehyde (MDA)”
Claim · model-written summary
Acid rain increased the content of malonyldialdehyde (MDA) in cucumber seedlings.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- acid raine1
- Outcome
- content of malonyldialdehyde (MDA)e1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“acid rain significantly increased the activities of guaiacol peroxidase (GPX) and superoxide dismutase (SOD), but decreased the activity of catalase (CAT) together with an increased content of malonyldialdehyde (MDA)”
Claim · model-written summary
The authors suggest the changes in photosynthesis under acid rain might be a secondary effect of acidity damage, probably due to lipid peroxidation in the thylakoid membrane, rather than a direct effect on the PS2 reaction centre.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- acid rain treatmente1
- Outcome
- changes in photosynthesise1
- Qualifier
- lipid peroxidation of lipids and proteins in thylakoid membranee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings (Cucumis sativus L. cv. Jingchun No. 4)”
e1“the changes in photosynthesis in acid rain treatment might be a secondary effect of acidity damage probably due to lipid peroxidation of lipids and proteins in thylakoid membrane rather than direct effect on PS2 reaction centre”
The same questions in other papers
rainfall · physiology: photosynthesis · Cucumis sativus (cucumber)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.