Abstract
Tomato (Lycopersicon esculentum Mill. cv. Pearson) plants were grown in growth chambers for 25 days with cadmium (Cd) and then exposed briefly to ozone (O3). Gas exchange, chlorophyll a fluorescence, and pigment composition were analysed in leaves at the end of the treatment to assess the effects of a single pollutant and their combination on photosynthesis. The CO2 assimilation rate was dramatically reduced in plants subjected to the combined treatment, while the single effect of Cd appeared less severe than that of O3. The decline of CO2 photoassimilation found in all O3-exposed plants was attributed to both stomatal and nonstomatal limitations. Tomato plants seemed to detoxify Cd to a great extent, but this resulted in growth suppression. In response to O3 exposure, the plants protected their photosystems by heat dissipation of excess energy via the xanthophyll cycle. Cd combined with O3 affected adversely this cycle resulting in an increase in photosynthetic performance under the same experimental light conditions.
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Claims 8
Claim · model-written summary
Combined cadmium and ozone dramatically reduced CO2 assimilation.
- Taxon
- Lycopersicon esculentum
Solanum lycopersicumt0 - Treatment
- combined treatmente0
- Outcome
- CO2 assimilation ratee0
- Direction
- dramatically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CO2 assimilation rate was dramatically reduced in plants subjected to the combined treatment”
t0“Lycopersicon esculentum”
Claim · model-written summary
Cadmium alone had a less severe effect than ozone alone.
- Taxon
- Lycopersicon esculentumSolanum lycopersicumt0
- Treatment
- Cde0
- Outcome
- effecte0
- Direction
- less severee0
- Comparator
- O3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the single effect of Cd appeared less severe than that of O3.”
t0“Lycopersicon esculentum”
Claim · model-written summary
The authors attributed reduced CO2 photoassimilation after ozone to stomatal and nonstomatal limitations.
- Taxon
- Lycopersicon esculentumSolanum lycopersicumt0
- Treatment
- O3-exposede0
- Outcome
- CO2 photoassimilatione0
- Direction
- declinee0
- Qualifier
- both stomatal and nonstomatal limitationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline of CO2 photoassimilation found in all O3-exposed plants was attributed to both stomatal and nonstomatal limitations.”
t0“Lycopersicon esculentum”
Claim · model-written summary
Tomato appeared to detoxify cadmium to a great extent.
- Taxon
- TomatoSolanum lycopersicume0
- Outcome
- detoxify Cd to a great extente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants seemed to detoxify Cd to a great extent”
Claim · model-written summary
Cadmium detoxification was accompanied by growth suppression.
- Taxon
- TomatoSolanum lycopersicume0
- Outcome
- growth suppressione0
- Qualifier
- detoxify Cd to a great extente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants seemed to detoxify Cd to a great extent, but this resulted in growth suppression.”
Claim · model-written summary
Under ozone, tomato protected photosystems by dissipating excess energy through the xanthophyll cycle.
- Taxon
- Lycopersicon esculentumSolanum lycopersicumt0
- Treatment
- O3 exposuree0
- Outcome
- protected their photosystemse0
- Qualifier
- heat dissipation of excess energy via the xanthophyll cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response to O3 exposure, the plants protected their photosystems by heat dissipation of excess energy via the xanthophyll cycle.”
t0“Lycopersicon esculentum”
Claim · model-written summary
Cadmium with ozone adversely affected the xanthophyll cycle.
- Taxon
- Lycopersicon esculentumSolanum lycopersicumt0
- Treatment
- Cd combined with O3e0
- Outcome
- this cyclee0
- Direction
- adverselye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd combined with O3 affected adversely this cycle resulting in an increase in photosynthetic performance under the same experimental light conditions.”
t0“Lycopersicon esculentum”
Claim · model-written summary
Cadmium with ozone increased photosynthetic performance under the experimental light conditions.
- Taxon
- Lycopersicon esculentumSolanum lycopersicumt0
- Treatment
- Cd combined with O3e0
- Outcome
- photosynthetic performancee0
- Direction
- increasee0
- Qualifier
- same experimental light conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd combined with O3 affected adversely this cycle resulting in an increase in photosynthetic performance under the same experimental light conditions.”
t0“Lycopersicon esculentum”
The same questions in other papers
cadmium atom · physiology: photosynthesis · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 16 in the opposite direction
- negative
- negative
- negative
14 papers more in this group
See all 18 papers →ozone · physiology: photosynthesis · Solanum lycopersicum (tomato)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
2 papers more in this group
See all 6 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.