Abstract
The most abundant copper proteins in green tissues are plastocyanin (PC) in thylakoids and copper/zinc superoxide dismutase (Cu/ZnSOD) of which the major isoforms are found in the cytosol and in the chloroplast stroma. An iron superoxide dismutase (FeSOD) can also be found in the stroma. The expression of superoxide dismutases (SODs) has been studied mainly in the context of abiotic stress. However, the availability of metal cofactors may also determine SOD expression patterns. Indeed, in Arabidopsis thaliana , Cu/ZnSOD enzymes were only expressed when copper was sufficient. This observation was made for plants grown on sucrose‐containing tissue culture media and regulation of SOD expression by copper has not been tested for other species. To investigate the effect of copper on SOD expression, we used a hydroponic set‐up in which plants grew without any evident stress symptoms. We observed that A. thaliana , Brassica juncea , Lycopersicum lycopersicum , Zea mays and Oryza sativa , downregulated Cu/ZnSOD in response to copper limitation. Under this condition, FeSOD expression was upregulated to replace Cu/ZnSOD in the stroma in all plants except Z. mays , in which FeSOD was not detectable. Copper limitation did not affect PC accumulation in any of the plants except Z. mays . Comparisons of leaf copper contents and SOD expression suggest that Cu/ZnSOD and FeSOD expression levels are good indicators of impending copper deficiency. Plants that downregulate Cu/ZnSOD and upregulate FeSOD under copper limitation can maintain superoxide scavenging and save copper for use in PC, which is essential for photosynthesis.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Arabidopsis thaliana downregulated Cu/ZnSOD under copper limitation.
- Taxon
- A. thaliana
Arabidopsis thalianae0 - Treatment
- copper limitatione0
- Gene
- Cu/ZnSODe0
- Outcome
- Cu/ZnSODe0
- Direction
- downregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. thaliana , Brassica juncea , Lycopersicum lycopersicum , Zea mays and Oryza sativa , downregulated Cu/ZnSOD in response to copper limitation”
Claim · model-written summary
Brassica juncea downregulated Cu/ZnSOD under copper limitation.
- Taxon
- Brassica juncea
Brassica junceae0 - Treatment
- copper limitatione0
- Gene
- Cu/ZnSODe0
- Outcome
- Cu/ZnSODe0
- Direction
- downregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. thaliana , Brassica juncea , Lycopersicum lycopersicum , Zea mays and Oryza sativa , downregulated Cu/ZnSOD in response to copper limitation”
Claim · model-written summary
Lycopersicum lycopersicum downregulated Cu/ZnSOD under copper limitation.
- Taxon
- Lycopersicum lycopersicume0
- Treatment
- copper limitatione0
- Gene
- Cu/ZnSODe0
- Outcome
- Cu/ZnSODe0
- Direction
- downregulatede0
Not reportedComparator
Verbatim
e0“A. thaliana , Brassica juncea , Lycopersicum lycopersicum , Zea mays and Oryza sativa , downregulated Cu/ZnSOD in response to copper limitation”
Claim · model-written summary
Zea mays downregulated Cu/ZnSOD under copper limitation.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. thaliana , Brassica juncea , Lycopersicum lycopersicum , Zea mays and Oryza sativa , downregulated Cu/ZnSOD in response to copper limitation”
Claim · model-written summary
Oryza sativa downregulated Cu/ZnSOD under copper limitation.
- Taxon
- Oryza sativa
Oryza sativae0 - Treatment
- copper limitatione0
- Gene
- Cu/ZnSODe0
- Outcome
- Cu/ZnSODe0
- Direction
- downregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. thaliana , Brassica juncea , Lycopersicum lycopersicum , Zea mays and Oryza sativa , downregulated Cu/ZnSOD in response to copper limitation”
Claim · model-written summary
FeSOD expression rose under copper limitation in all tested species except Zea mays.
Not reportedTreatmentComparator
Verbatim
e0“FeSOD expression was upregulated to replace Cu/ZnSOD in the stroma in all plants except Z. mays , in which FeSOD was not detectable”
Claim · model-written summary
FeSOD was undetectable in Zea mays under copper limitation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z. mays , in which FeSOD was not detectable”
Claim · model-written summary
Copper limitation did not affect plastocyanin accumulation in most tested species.
- Taxon
- plants except Z. mayse0
- Treatment
- Copper limitatione0
- Gene
- PCe0
- Outcome
- PC accumulatione0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“Copper limitation did not affect PC accumulation in any of the plants except Z. mays”
Claim · model-written summary
Zea mays was the exception to unchanged plastocyanin accumulation under copper limitation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Copper limitation did not affect PC accumulation in any of the plants except Z. mays”
Claim · model-written summary
Cu/ZnSOD and FeSOD expression were suggested as indicators of impending copper deficiency.
- Outcome
- good indicators of impending copper deficiencye0
- Comparator
- Cu/ZnSOD and FeSOD expression levelse0
Not reportedTaxonValue
Verbatim
e0“Cu/ZnSOD and FeSOD expression levels are good indicators of impending copper deficiency”
Claim · model-written summary
The authors infer that switching from Cu/ZnSOD to FeSOD can maintain superoxide scavenging while saving copper for plastocyanin.
- Taxon
- PlantsViridiplantaee0
- Gene
- Cu/ZnSODe0
- Outcome
- maintain superoxide scavenging and save copper for use in PCe0
- Qualifier
- under copper limitatione0
Verbatim
e0“Plants that downregulate Cu/ZnSOD and upregulate FeSOD under copper limitation can maintain superoxide scavenging and save copper for use in PC, which is essential for photosynthesis”
The same questions in other papers
copper atom · nutrient: content · Zea mays (maize)Results differ
10 papers in the same direction as this paper · 14 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- no effect
- negative
21 papers more in this group
See all 25 papers →copper atom · nutrient: content · Oryza sativa (rice)Positive and negative results
10 papers in the same direction as this paper · 6 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- no effect
- negative
13 papers more in this group
See all 17 papers →copper atom · nutrient: content · Brassica juncea (Indian mustard)Results agree
1 paper in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
copper atom · nutrient: content · Arabidopsis thaliana (thale cress)Results agree
2 papers in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- 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.