Abstract
Growth, CO 2 exchange, and the ultrastructure of chloroplasts were investigated in the leaves of potato plants ( Solanum tuberosum L., cv. Désirée) of wild type and transformed with a gene for yeast invertase under the control of patatin class I B33 promoter (for apoplastic enzyme) grown in vitro on the Murashige and Skoog medium supplemented with 2% sucrose. At a temperature of 22°C optimal for growth, the transformed plants differed from the plants of wild type in retarded growth and a lower rate of photosynthesis as calculated per plant. On a leaf dry weight basis, photosynthesis of transformed plants was higher than in control plants. Under hypothermia (5°C), dark respiration and especially photosynthesis of transformed plants turned out to be more intense than in control material. After a prolonged exposure to low temperature (6 days at 5°C), in the plants of both genotypes, the ultrastructure of chloroplasts changed. Absolute areas of sections of chloroplasts and starch grains rose, and the area of plastoglobules decreased; in transformed plants, these changes were more pronounced. By some ultrastructural characteristics: a reduction in the cold of relative total area of sections of starch grains and plastoglobules (in percents of the chloroplast section area) and in the number of granal thylakoids (per a chloroplast section area), transformed plants turned out to be more cold resistant than wild-type plants. The obtained results are discussed in connection with changes in source-sink relations in transformed potato plants. These changes modify the balance between photosynthesis and retarded efflux of assimilates, causing an increase in the intracellular level of sugars and a rise in the tolerance to chilling.
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Claims 9
Claim · model-written summary
At 22°C transformed plants grew more slowly than wild type.
- Taxon
- potato plants
Solanum tuberosumt0 - Treatment
- transformed plantse0
- Outcome
- growthe0
- Direction
- retardede0
- Comparator
- wild typee0
- Setting
- 22°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a temperature of 22°C optimal for growth, the transformed plants differed from the plants of wild type in retarded growth”
t0“potato plants”
Claim · model-written summary
At 22°C transformed plants had lower photosynthesis per plant.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- transformed plantse0
- Outcome
- rate of photosynthesis as calculated per plante0
- Direction
- lowere0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transformed plants differed from the plants of wild type in retarded growth and a lower rate of photosynthesis as calculated per plant”
t0“potato plants”
Claim · model-written summary
On a dry weight basis transformed leaves photosynthesized more than controls.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- transformed plantse0
- Outcome
- photosynthesise0
- Direction
- highere0
- Qualifier
- On a leaf dry weight basise0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On a leaf dry weight basis, photosynthesis of transformed plants was higher than in control plants.”
t0“potato plants”
Claim · model-written summary
At 5°C transformed plants had more intense dark respiration than controls.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- transformed plantse0
- Outcome
- dark respiratione0
- Direction
- more intensee0
- Comparator
- control materiale0
- Setting
- 5°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under hypothermia (5°C), dark respiration and especially photosynthesis of transformed plants turned out to be more intense than in control material.”
t0“potato plants”
Claim · model-written summary
At 5°C transformed plants had more intense photosynthesis than controls.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- transformed plantse0
- Outcome
- photosynthesise0
- Direction
- more intensee0
- Comparator
- control materiale0
- Setting
- 5°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under hypothermia (5°C), dark respiration and especially photosynthesis of transformed plants turned out to be more intense than in control material.”
t0“potato plants”
Claim · model-written summary
Six days at 5°C increased chloroplast and starch grain section areas, more strongly in transformed plants.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- 6 days at 5°Ce0
- Outcome
- Absolute areas of sections of chloroplasts and starch grainse0
- Direction
- rosee0
- Qualifier
- in transformed plants, these changes were more pronouncede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After a prolonged exposure to low temperature (6 days at 5°C), in the plants of both genotypes, the ultrastructure of chloroplasts changed. Absolute areas of sections of chloroplasts and starch grains rose, and the area of plastoglobules decreased; in transformed plants, these changes were more pronounced.”
t0“potato plants”
Claim · model-written summary
Six days at 5°C decreased plastoglobule area, more strongly in transformed plants.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- 6 days at 5°Ce0
- Outcome
- area of plastoglobulese0
- Direction
- decreasede0
- Qualifier
- in transformed plants, these changes were more pronouncede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After a prolonged exposure to low temperature (6 days at 5°C), in the plants of both genotypes, the ultrastructure of chloroplasts changed. Absolute areas of sections of chloroplasts and starch grains rose, and the area of plastoglobules decreased; in transformed plants, these changes were more pronounced.”
t0“potato plants”
Claim · model-written summary
Transformed plants showed greater cold resistance by chloroplast structural traits.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- cold resistante0
- Direction
- moree0
- Comparator
- wild-type plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transformed plants turned out to be more cold resistant than wild-type plants.”
t0“potato plants”
Claim · model-written summary
Altered source–sink relations were proposed to raise sugars and chilling tolerance.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- tolerance to chillinge0
- Qualifier
- balance between photosynthesis and retarded efflux of assimilatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These changes modify the balance between photosynthesis and retarded efflux of assimilates, causing an increase in the intracellular level of sugars and a rise in the tolerance to chilling.”
t0“potato plants”
The same questions in other papers
transgenic · physiology: photosynthesis · Solanum tuberosum (potato)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
1 paper more in this group
See all 5 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.