Abstract
When the seedlings of two rice cultivars, IR8 (low-temperature sensitive) and Somewake (low-temperature tolerant), were exposed to a low temperature of 15°C, the normal increase in the chlorophyll content of the developing 4th leaf blade completely ceased while increases in protein content continued at a low rate in both cultivars. Analysis of soluble and insoluble proteins in the 4th leaf blade of IR8 by SDS-polyacrylamide gel electrophoresis revealed that synthesis of RuBP carboxylase and of several thylakoid proteins responsible for photosynthetic electron transport and photophosphorylation was greatly inhibited at the low temperature. It was also found that increases in the activities of some enzymes of the Calvin cycle, such as RuBP carboxylase, fructose bisphosphatase and NADP-glyceraldehyde-3-P dehydrogenase, as well as of catalase, were specifically inhibited during growth at the low temperature. These results suggest that the synthesis of intracellular components, in particular of key proteins required for photosynthesis, is specifically susceptible to low-temperature stress during development of rice leaves.
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Claims 7
Claim · model-written summary
At 15°C, chlorophyll content stopped increasing in the developing fourth leaf of both cultivars.
- Taxon
- rice
Oryza sativae0 - Material
- IR8e0
- Organ / stage
- developing 4th leaf bladee0
- Treatment
- low temperature of 15°Ce0
- Outcome
- chlorophyll contente0
- Direction
- completely ceasede0
- Comparator
- normal increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two rice cultivars, IR8 (low-temperature sensitive) and Somewake (low-temperature tolerant), were exposed to a low temperature of 15°C, the normal increase in the chlorophyll content of the developing 4th leaf blade completely ceased”
Claim · model-written summary
Protein content continued to increase slowly at 15°C in both cultivars.
- Taxon
- RiceOryza sativat0
- Outcome
- protein contente0
- Direction
- increasese0
- Qualifier
- at a low ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in protein content continued at a low rate in both cultivars”
t0“Rice”
Claim · model-written summary
Low temperature greatly inhibited synthesis of RuBP carboxylase in IR8 fourth leaves.
- Taxon
- RiceOryza sativat0
- Treatment
- low temperaturee0
- Gene
- RuBP carboxylasee0
- Outcome
- synthesis of RuBP carboxylasee0
- Direction
- greatly inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“synthesis of RuBP carboxylase and of several thylakoid proteins responsible for photosynthetic electron transport and photophosphorylation was greatly inhibited at the low temperature”
t0“Rice”
Claim · model-written summary
Low temperature greatly inhibited synthesis of thylakoid proteins.
- Taxon
- RiceOryza sativat0
- Treatment
- low temperaturee0
- Outcome
- several thylakoid proteinse0
- Direction
- greatly inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“synthesis of RuBP carboxylase and of several thylakoid proteins responsible for photosynthetic electron transport and photophosphorylation was greatly inhibited at the low temperature”
t0“Rice”
Claim · model-written summary
Low temperature inhibited increases in Calvin cycle enzyme activities.
- Taxon
- RiceOryza sativat0
- Treatment
- low temperaturee0
- Outcome
- activities of some enzymes of the Calvin cyclee0
- Direction
- specifically inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in the activities of some enzymes of the Calvin cycle, such as RuBP carboxylase, fructose bisphosphatase and NADP-glyceraldehyde-3-P dehydrogenase, as well as of catalase, were specifically inhibited during growth at the low temperature”
t0“Rice”
Claim · model-written summary
Low temperature inhibited the increase in catalase activity.
- Taxon
- RiceOryza sativat0
- Treatment
- low temperaturee0
- Gene
- catalasee0
- Outcome
- catalasee0
- Direction
- specifically inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as well as of catalase, were specifically inhibited during growth at the low temperature”
t0“Rice”
Claim · model-written summary
Key photosynthetic protein synthesis appears particularly susceptible to cold during leaf development.
- Taxon
- riceOryza sativae0
- Treatment
- low-temperature stresse0
- Outcome
- synthesis of intracellular componentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the synthesis of intracellular components, in particular of key proteins required for photosynthesis, is specifically susceptible to low-temperature stress during development of rice leaves”
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