Abstract
Effects on oxygen evolution of the storage of detached cucumber (Cucumis sativus) leaves at 0 degrees C in the dark were investigated with thylakoids and oxygen-evolving photosystem II membranes isolated from stored leaves. The cold and dark treatment of leaves selectively inactivated electron transport on the oxidizing side of photosystem II. Photosystem II membranes isolated from treated leaves were largely depleted of two proteins of 20 and 14 kilodaltons, which correspond to the extrinsic 23- and 17- kilodalton proteins of spinach functioning in oxygen evolution. The manganese content of photosystem II membranes was also markedly reduced by the treatment. Thus, the inactivation of oxygen evolution induced by the dark, chilling treatment is ascribed to solubilization of the 20- and 14-kilodalton proteins and extraction of manganese.
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Claims 4
Claim · model-written summary
Dark chilling selectively inactivated electron transport on the oxidizing side of photosystem II.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- leavese0
- Treatment
- cold and dark treatmente1
- Outcome
- electron transport on the oxidizing side of photosystem IIe1
- Direction
- inactivatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus) leaves”
e1“The cold and dark treatment of leaves selectively inactivated electron transport on the oxidizing side of photosystem II.”
Claim · model-written summary
Photosystem II membranes from treated cucumber leaves were largely depleted of two proteins.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- Photosystem II membranese1
- Treatment
- treated leavese1
- Outcome
- two proteins of 20 and 14 kilodaltonse1
- Direction
- largely depletede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus) leaves”
e1“Photosystem II membranes isolated from treated leaves were largely depleted of two proteins of 20 and 14 kilodaltons, which correspond to the extrinsic 23- and 17- kilodalton proteins of spinach functioning in oxygen evolution.”
Claim · model-written summary
Dark chilling markedly reduced manganese content of photosystem II membranes.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- the treatmente1
- Outcome
- manganese content of photosystem II membranese1
- Direction
- markedly reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus) leaves”
e1“The manganese content of photosystem II membranes was also markedly reduced by the treatment.”
Claim · model-written summary
The authors attribute loss of oxygen evolution to protein solubilization and manganese extraction.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- dark, chilling treatmente1
- Outcome
- inactivation of oxygen evolutione1
- Qualifier
- solubilization of the 20- and 14-kilodalton proteins and extraction of manganesee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus) leaves”
e1“the inactivation of oxygen evolution induced by the dark, chilling treatment is ascribed to solubilization of the 20- and 14-kilodalton proteins and extraction of manganese.”
The same questions in other papers
cold · physiology: photosynthesis · Cucumis sativus (cucumber)Results differ
32 papers in the same direction as this paper · 6 in the opposite direction
- positive
- no effect
- positive
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See all 39 papers →light · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
30 papers in the same direction as this paper · 30 in the opposite direction
- negative
- negative
- positive
57 papers more in this group
See all 61 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.