Abstract
Gibberellic acid (GA) stimulated both the elongation of Avena sativa stem segments and increased synthesis of cell wall material. The effects of GA on glucose metabolism, as related to cell wall synthesis, have been investigated in order to find specific events regulated by GA. GA caused a decline in the levels of glucose, glucose 6-phosphate, and fructose 6-phosphate if exogenous sugar was not supplied to the segments, whereas the hormone caused no change in the levels of glucose 6-phosphate, fructose 6-phosphate, UDP-glucose, or the adenylate energy charge if the segments were incubated in 0.1 m glucose. No GA-induced change could be demonstrated in the activities of hexokinase, phosphoglucomutase, UDP-glucose pyrophosphorylase, or polysaccharide synthetases using UDP-glucose, UDP-galactose, UDP-xylose, and UDP-arabinose as substrates. GA stimulated the activity of GDP-glucose-dependent beta-glucan synthetase by 2- to 4-fold over the control. When glucan synthetase was assayed using UDP-glucose as substrate, only beta-1,3-linked glucan was synthesized in vitro, whereas with GDP-glucose, only beta-1,4-linked glucan was synthesized. These results suggest that one part of the mechanism by which GA stimulates cell wall synthesis concurrently with elongation in Avena stem segments may be through a stimulation of cell wall polysaccharide synthetase activity.
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Claims 11
Claim · model-written summary
Gibberellic acid stimulated stem-segment elongation.
- Taxon
- Avena sativa
Avena sativae0 - Organ / stage
- stem segmentse0
- Treatment
- Gibberellic acid (GA)e0
- Outcome
- elongation of Avena sativa stem segmentse0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellic acid (GA) stimulated both the elongation of Avena sativa stem segments and increased synthesis of cell wall material”
Claim · model-written summary
Gibberellic acid increased cell-wall material synthesis.
- Taxon
- Avena sativaAvena sativae0
- Treatment
- Gibberellic acid (GA)e0
- Outcome
- synthesis of cell wall materiale0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellic acid (GA) stimulated both the elongation of Avena sativa stem segments and increased synthesis of cell wall material”
Claim · model-written summary
Without exogenous sugar, GA lowered glucose, glucose 6-phosphate and fructose 6-phosphate levels.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- GAe0
- Outcome
- levels of glucose, glucose 6-phosphate, and fructose 6-phosphatee0
- Direction
- declinee0
- Qualifier
- if exogenous sugar was not suppliede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA caused a decline in the levels of glucose, glucose 6-phosphate, and fructose 6-phosphate if exogenous sugar was not supplied to the segments”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
In 0.1 m glucose, GA did not change glucose 6-phosphate, fructose 6-phosphate or UDP-glucose levels.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- the hormonee0
- Outcome
- levels of glucose 6-phosphate, fructose 6-phosphate, UDP-glucosee0
- Direction
- no changee0
- Qualifier
- 0.1 m glucosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hormone caused no change in the levels of glucose 6-phosphate, fructose 6-phosphate, UDP-glucose, or the adenylate energy charge if the segments were incubated in 0.1 m glucose”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
In 0.1 m glucose, GA did not change adenylate energy charge.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- the hormonee0
- Outcome
- adenylate energy chargee0
- Direction
- no changee0
- Qualifier
- 0.1 m glucosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hormone caused no change in the levels of glucose 6-phosphate, fructose 6-phosphate, UDP-glucose, or the adenylate energy charge if the segments were incubated in 0.1 m glucose”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
GA did not measurably change hexokinase, phosphoglucomutase or UDP-glucose pyrophosphorylase activity.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- GAe0
- Outcome
- activities of hexokinase, phosphoglucomutase, UDP-glucose pyrophosphorylasee0
- Direction
- No GA-induced changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No GA-induced change could be demonstrated in the activities of hexokinase, phosphoglucomutase, UDP-glucose pyrophosphorylase, or polysaccharide synthetases using UDP-glucose, UDP-galactose, UDP-xylose, and UDP-arabinose as substrates”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
GA did not measurably change polysaccharide synthetase activities with the stated UDP-sugar substrates.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- GAe0
- Outcome
- polysaccharide synthetasese0
- Direction
- No GA-induced changee0
- Qualifier
- UDP-glucose, UDP-galactose, UDP-xylose, and UDP-arabinosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No GA-induced change could be demonstrated in the activities of hexokinase, phosphoglucomutase, UDP-glucose pyrophosphorylase, or polysaccharide synthetases using UDP-glucose, UDP-galactose, UDP-xylose, and UDP-arabinose as substrates”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
GA increased GDP-glucose-dependent beta-glucan synthetase activity two- to fourfold over control.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- GAe0
- Gene
- GDP-glucose-dependent beta-glucan synthetasee0
- Outcome
- activity of GDP-glucose-dependent beta-glucan synthetasee0
- Direction
- stimulatede0
- Value
- 2- to 4-folde0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA stimulated the activity of GDP-glucose-dependent beta-glucan synthetase by 2- to 4-fold over the control”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
With UDP-glucose substrate, glucan synthetase synthesized only beta-1,3-linked glucan in vitro.
- Taxon
- Avena sativaAvena sativae2
- Gene
- glucan synthetasee0
- Outcome
- only beta-1,3-linked glucan was synthesizede0
- Qualifier
- UDP-glucosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When glucan synthetase was assayed using UDP-glucose as substrate, only beta-1,3-linked glucan was synthesized in vitro”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
With GDP-glucose substrate, glucan synthetase synthesized only beta-1,4-linked glucan.
- Taxon
- Avena sativaAvena sativae2
- Outcome
- only beta-1,4-linked glucan was synthesizede0
- Qualifier
- GDP-glucosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with GDP-glucose, only beta-1,4-linked glucan was synthesized”
t0“Avena”
e2“Avena sativa stem segments”
Claim · model-written summary
The authors suggest GA-stimulated polysaccharide synthetase activity may explain some concurrent wall synthesis and elongation.
- Treatment
- GAe0
- Outcome
- cell wall synthesis concurrently with elongatione0
- Qualifier
- stimulation of cell wall polysaccharide synthetase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that one part of the mechanism by which GA stimulates cell wall synthesis concurrently with elongation in Avena stem segments may be through a stimulation of cell wall polysaccharide synthetase activity”
The same questions in other papers
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- positive
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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.