Abstract
The effects of temperature on ribulose bisphosphate carboxylase activity were studied in two tomato ( Lycopersicon esculentum Mill.) cultivars which differed in sensitivity to high temperatures. The heat tolerant cultivar, Saladette, had a smaller reduction in photosynthesis and a smaller increase in mesophyll resistance then the sensitive cultivar Roma VF, after 24 h at 35 to 40°C. One hour in vitro treatments at 50°C decreased the activity of ribulose bisphosphate carboxylase extracted from Roma VF by 75%, while Saladette was not affected. Heat stress to the entire plant caused greater inhibition of ribulose bisphosphate carboxylase in the heat sensitive cultivar. Ribulose bisphosphate carboxylase activity in both cultivars decreased with heat treatment but recovered under normal temperatures. Ribulose bisphosphate oxygenase activity decreased similarly in both cultivars under 37/18°C day/night temperatures, which resulted in an apparent change in the relative carboxylase/oxygenase activity of the two cultivars. Carbonic anhydrase activity was slightly greater in Saladette than in Roma VF but no significant decrease in activity was observed in plants exposed to high temperatures.
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Claims 10
Claim · model-written summary
Saladette had a smaller heat induced reduction in photosynthesis than Roma VF after 24 h at 35 to 40°C.
- Taxon
- tomato
Solanum lycopersicume1 - Material
- Saladettee0
- Treatment
- 24 h at 35 to 40°Ce0
- Outcome
- photosynthesise0
- Direction
- smaller reductione0
- Comparator
- Roma VFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The heat tolerant cultivar, Saladette, had a smaller reduction in photosynthesis and a smaller increase in mesophyll resistance then the sensitive cultivar Roma VF, after 24 h at 35 to 40°C”
e1“two tomato ( Lycopersicon esculentum Mill.) cultivars”
Claim · model-written summary
Saladette had a smaller heat induced increase in mesophyll resistance than Roma VF.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Saladettee0
- Treatment
- 24 h at 35 to 40°Ce0
- Outcome
- mesophyll resistancee0
- Direction
- smaller increasee0
- Comparator
- Roma VFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The heat tolerant cultivar, Saladette, had a smaller reduction in photosynthesis and a smaller increase in mesophyll resistance then the sensitive cultivar Roma VF, after 24 h at 35 to 40°C”
e1“two tomato ( Lycopersicon esculentum Mill.) cultivars”
Claim · model-written summary
One hour at 50°C reduced extracted carboxylase activity in Roma VF by 75%.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- Roma VFe0
- Treatment
- One hour in vitro treatments at 50°Ce0
- Gene
- ribulose bisphosphate carboxylasee0
- Outcome
- activity of ribulose bisphosphate carboxylasee0
- Direction
- decreasede0
- Value
- 75%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One hour in vitro treatments at 50°C decreased the activity of ribulose bisphosphate carboxylase extracted from Roma VF by 75%”
t0“tomato cultivars”
Claim · model-written summary
Saladette carboxylase activity was unaffected by one hour at 50°C.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- Saladettee0
- Treatment
- One hour in vitro treatments at 50°Ce1
- Outcome
- activity of ribulose bisphosphate carboxylasee1
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while Saladette was not affected”
e1“One hour in vitro treatments at 50°C decreased the activity of ribulose bisphosphate carboxylase extracted from Roma VF by 75%”
t0“tomato cultivars”
Claim · model-written summary
Whole plant heat stress inhibited carboxylase more in the heat sensitive cultivar.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Heat stress to the entire plante0
- Outcome
- ribulose bisphosphate carboxylasee0
- Direction
- greater inhibitione0
- Qualifier
- heat sensitive cultivare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress to the entire plant caused greater inhibition of ribulose bisphosphate carboxylase in the heat sensitive cultivar”
t0“tomato cultivars”
Claim · model-written summary
Heat treatment reduced carboxylase activity in both cultivars, followed by recovery at normal temperatures.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- heat treatmente0
- Outcome
- Ribulose bisphosphate carboxylase activitye0
- Direction
- decreasede0
- Qualifier
- recovered under normal temperaturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribulose bisphosphate carboxylase activity in both cultivars decreased with heat treatment but recovered under normal temperatures”
t0“tomato cultivars”
Claim · model-written summary
Oxygenase activity declined similarly in both cultivars under 37/18°C day/night temperatures.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 37/18°C day/night temperaturese0
- Outcome
- Ribulose bisphosphate oxygenase activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribulose bisphosphate oxygenase activity decreased similarly in both cultivars under 37/18°C day/night temperatures”
t0“tomato cultivars”
Claim · model-written summary
The heat response apparently changed relative carboxylase to oxygenase activity between cultivars.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- relative carboxylase/oxygenase activitye0
- Qualifier
- apparent changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which resulted in an apparent change in the relative carboxylase/oxygenase activity of the two cultivars”
t0“tomato cultivars”
Claim · model-written summary
Carbonic anhydrase activity was slightly greater in Saladette than Roma VF.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- Saladettee0
- Outcome
- Carbonic anhydrase activitye0
- Direction
- slightly greatere0
- Comparator
- Roma VFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbonic anhydrase activity was slightly greater in Saladette than in Roma VF”
t0“tomato cultivars”
Claim · model-written summary
High temperature exposure did not significantly lower carbonic anhydrase activity.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- high temperaturese0
- Outcome
- Carbonic anhydrase activitye1
- Direction
- no significant decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant decrease in activity was observed in plants exposed to high temperatures”
e1“Carbonic anhydrase activity was slightly greater in Saladette than in Roma VF”
t0“tomato cultivars”
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See all 7 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.