Abstract
Following tuber excision from the mother plant sucrose synthase activity fell from 3,120 to 960 nmol/g.f. wt./h within 7 days and starch synthesis ({sup 14}C sucrose incorporated into isolated discs) from 23 to 7 nmol/g.f. wt./h. While the maximum catalytic activity of sucrose synthase was more than sufficient to account for the observed rate of starch synthesis a maximum of 27% of sucrose incorporated by discs was converted into starch within 3 h. This compared with 80% conversion of {sup 14}C glucose incorporated. Tuber excision also reduced the rate of starch biosynthesis with glucose as a substrate (from 206 to 64 nmol/g.f. wt./h). The activities of UDPG-pyrophosphorylase, PPi-PFK, ATP-PFK, starch synthase and hexokinase (glucose or fructose substrates) were unaffected by tuber removal. ADPG pyrophosphorylase activity was reduced from 8,000 to 4,500 nmol/g.f. wt./h. Preliminary experiments indicate that the decline in sucrose synthease activity is prevented by maintaining sucrose flux into tubers through the cut stolon.
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Claims 10
Claim · model-written summary
After tuber excision, sucrose synthase activity fell from 3,120 to 960 nmol/g.f. wt./h within seven days.
- Taxon
- potato
Solanum tuberosumt0 - Organ / stage
- tuberst0
- Treatment
- tuber excision from the mother plante0
- Gene
- sucrose synthasee0
- Outcome
- sucrose synthase activitye0
- Direction
- felle0
- Value
- from 3,120 to 960 nmol/g.f. wt./he0
- Qualifier
- within 7 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following tuber excision from the mother plant sucrose synthase activity fell from 3,120 to 960 nmol/g.f. wt./h within 7 days”
t0“potato tubers”
Claim · model-written summary
After tuber excision, starch synthesis from sucrose fell from 23 to 7 nmol/g.f. wt./h.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- tuberst0
- Treatment
- tuber excisione1
- Outcome
- starch synthesise0
- Value
- from 23 to 7 nmol/g.f. wt./he0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starch synthesis ({sup 14}C sucrose incorporated into isolated discs) from 23 to 7 nmol/g.f. wt./h”
e1“Following tuber excision from the mother plant”
t0“potato tubers”
Claim · model-written summary
Maximum sucrose synthase catalytic activity exceeded that needed for observed starch synthesis.
- Taxon
- potatoSolanum tuberosumt0
- Gene
- sucrose synthasee0
- Outcome
- maximum catalytic activity of sucrose synthasee0
- Direction
- more than sufficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum catalytic activity of sucrose synthase was more than sufficient to account for the observed rate of starch synthesis”
t0“potato tubers”
Claim · model-written summary
At most 27% of incorporated sucrose was converted into starch within three hours.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- sucrose incorporated by discs was converted into starche0
- Direction
- maximume0
- Value
- 27%e0
- Qualifier
- within 3 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a maximum of 27% of sucrose incorporated by discs was converted into starch within 3 h”
t0“potato tubers”
Claim · model-written summary
Glucose incorporation yielded 80% conversion into starch.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- conversion of {sup 14}C glucose incorporatede0
- Value
- 80%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“80% conversion of {sup 14}C glucose incorporated”
t0“potato tubers”
Claim · model-written summary
Tuber excision reduced glucose-based starch biosynthesis from 206 to 64 nmol/g.f. wt./h.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Tuber excisione0
- Outcome
- rate of starch biosynthesis with glucose as a substratee0
- Direction
- reducede0
- Value
- from 206 to 64 nmol/g.f. wt./he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber excision also reduced the rate of starch biosynthesis with glucose as a substrate (from 206 to 64 nmol/g.f. wt./h)”
t0“potato tubers”
Claim · model-written summary
Tuber removal left UDPG-pyrophosphorylase, PPi-PFK and ATP-PFK activities unaffected.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- tuber removale0
- Gene
- UDPG-pyrophosphorylase, PPi-PFK, ATP-PFKe0
- Outcome
- activities of UDPG-pyrophosphorylase, PPi-PFK, ATP-PFKe0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of UDPG-pyrophosphorylase, PPi-PFK, ATP-PFK, starch synthase and hexokinase (glucose or fructose substrates) were unaffected by tuber removal”
t0“potato tubers”
Claim · model-written summary
Tuber removal left starch synthase and hexokinase activities unaffected.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- tuber removale0
- Gene
- starch synthase and hexokinasee0
- Outcome
- starch synthase and hexokinasee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of UDPG-pyrophosphorylase, PPi-PFK, ATP-PFK, starch synthase and hexokinase (glucose or fructose substrates) were unaffected by tuber removal”
t0“potato tubers”
Claim · model-written summary
ADPG pyrophosphorylase activity was reduced from 8,000 to 4,500 nmol/g.f. wt./h.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- tuber removale1
- Gene
- ADPG pyrophosphorylasee0
- Outcome
- ADPG pyrophosphorylase activitye0
- Direction
- reducede0
- Value
- from 8,000 to 4,500 nmol/g.f. wt./he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ADPG pyrophosphorylase activity was reduced from 8,000 to 4,500 nmol/g.f. wt./h”
e1“tuber removal”
t0“potato tubers”
Claim · model-written summary
Maintaining sucrose flux through the cut stolon appeared to prevent a decline in sucrose synthase activity.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- maintaining sucrose flux into tubers through the cut stolone0
- Gene
- sucrose syntheasee0
- Outcome
- decline in sucrose synthease activitye0
- Direction
- preventede0
- Qualifier
- Preliminary experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preliminary experiments indicate that the decline in sucrose synthease activity is prevented by maintaining sucrose flux into tubers through the cut stolon”
t0“potato tubers”
The same questions in other papers
sucrose · physiology: enzyme activity · Solanum tuberosum (potato)Results agree
3 papers in the same direction as this paper
- positive
- 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.