Abstract
Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue. The IAA effect is observable in tissue from all parts of the elongation zone of the pea stem, and also in older tissue that is not capable of a cell enlargement response to IAA. A large increase in activity is caused by IAA only if synthetase activity in the isolated tissue has first been allowed to fall substantially below the intact plant level, and only if sucrose is supplied along with IAA. Treatment of tissue with sucrose alone after a period of sugar starvation causes a transient rise of synthetase activity. The decline in synthetase activity in absence of IAA, the rise caused by IAA, and the transient rise caused by sucrose are all strongly temperature-dependent. IAA and sucrose do not affect the activity of isolated synthetase particles. Synthetase activity in vivo is sensitive to as low as 0.1 mum IAA and is increased by IAA analogues that are active as auxins on elongation but not by nonauxin analogues. Activity begins to rise 10 to 15 minutes after exposure to IAA, which places this among the most rapid enzyme effects of a plant growth regulator heretofore demonstrated, and among the most rapid known metabolic effects of auxins. The effect is seen also with polysaccharide synthetase activity using uridine diphosphate-galactose or uridine diphosphate-xylose as substrates, and to a lesser extent with guanosine diphosphoglucose-dependent glucan synthetase activity. Glucan synthetase from IAA-treated tissue appears to have a higher affinity for uridine diphosphate-glucose than the control.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 13
Claim · model-written summary
IAA increased particulate beta-glucan synthetase activity two- to fourfold within one hour.
- Taxon
- pea
Lathyrus oleraceust0 - Organ / stage
- stem segmentse0
- Treatment
- indoleacetic acid (IAA)e0
- Gene
- beta-glucan synthetasee0
- Outcome
- activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetasee0
- Direction
- increasee0
- Value
- 2- to 4-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
The IAA effect occurred throughout the elongation zone and in older tissue unable to enlarge in response to IAA.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- elongation zone of the pea steme0
- Outcome
- IAA effecte0
- Qualifier
- older tissue that is not capable of a cell enlargement response to IAAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The IAA effect is observable in tissue from all parts of the elongation zone of the pea stem, and also in older tissue that is not capable of a cell enlargement response to IAA.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
A large IAA-induced increase required a prior decline in synthetase activity and supplied sucrose.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- synthetase activitye0
- Direction
- increasee0
- Qualifier
- only if sucrose is supplied along with IAAe0
- Comparator
- intact plant levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A large increase in activity is caused by IAA only if synthetase activity in the isolated tissue has first been allowed to fall substantially below the intact plant level, and only if sucrose is supplied along with IAA.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
Sucrose alone caused a transient increase in synthetase activity after sugar starvation.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- sucrose alonee0
- Outcome
- synthetase activitye0
- Direction
- risee0
- Qualifier
- after a period of sugar starvatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of tissue with sucrose alone after a period of sugar starvation causes a transient rise of synthetase activity.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
The decline without IAA, rise with IAA, and transient rise with sucrose were strongly temperature dependent.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- synthetase activitye0
- Qualifier
- strongly temperature-dependente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline in synthetase activity in absence of IAA, the rise caused by IAA, and the transient rise caused by sucrose are all strongly temperature-dependent.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
IAA did not alter isolated synthetase particle activity.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- activity of isolated synthetase particlese0
- Direction
- do not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IAA and sucrose do not affect the activity of isolated synthetase particles.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
Sucrose did not alter isolated synthetase particle activity.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- sucrosee0
- Outcome
- activity of isolated synthetase particlese0
- Direction
- do not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IAA and sucrose do not affect the activity of isolated synthetase particles.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
Synthetase activity in vivo responded to IAA concentrations as low as 0.1 mum.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- 0.1 mum IAAe0
- Outcome
- Synthetase activity in vivoe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Synthetase activity in vivo is sensitive to as low as 0.1 mum IAA”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
Auxin-active IAA analogues increased synthetase activity.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAA analogues that are active as auxins on elongatione0
- Outcome
- Synthetase activity in vivoe0
- Direction
- increasede0
- Comparator
- nonauxin analoguese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Synthetase activity in vivo is sensitive to as low as 0.1 mum IAA and is increased by IAA analogues that are active as auxins on elongation but not by nonauxin analogues.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
Synthetase activity began rising 10 to 15 minutes after IAA exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activity begins to rise 10 to 15 minutes after exposure to IAA”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
IAA also increased polysaccharide synthetase activity with uridine diphosphate-galactose or uridine diphosphate-xylose substrates.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe1
- Outcome
- polysaccharide synthetase activitye0
- Qualifier
- uridine diphosphate-galactose or uridine diphosphate-xylose as substratese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect is seen also with polysaccharide synthetase activity using uridine diphosphate-galactose or uridine diphosphate-xylose as substrates”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
IAA had a smaller effect on guanosine diphosphoglucose-dependent glucan synthetase activity.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe1
- Outcome
- guanosine diphosphoglucose-dependent glucan synthetase activitye0
- Direction
- to a lesser extente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“to a lesser extent with guanosine diphosphoglucose-dependent glucan synthetase activity.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
Claim · model-written summary
Glucan synthetase from IAA-treated tissue appeared to have higher affinity for uridine diphosphate-glucose than control.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAA-treated tissuee0
- Outcome
- affinity for uridine diphosphate-glucosee0
- Direction
- highere0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glucan synthetase from IAA-treated tissue appears to have a higher affinity for uridine diphosphate-glucose than the control.”
e1“Treatment of pea stem segments with indoleacetic acid (IAA) causes within 1 hour a 2- to 4-fold increase in activity of particulate uridine diphosphoglucose-dependent beta-glucan synthetase obtainable from the tissue.”
t0“Pea Stem Tissue”
t1“Auxin”
The same questions in other papers
sucrose · physiology: enzyme activity · Lathyrus oleraceus (pea)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
1 paper more in this group
See all 5 papers →indole-3-acetic acid · physiology: enzyme activity · Lathyrus oleraceus (pea)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
2 papers more in this group
See all 6 papers →indole-3-acetic acid · molecular: metabolites · Lathyrus oleraceus (pea)Positive and negative results
11 papers in the same direction as this paper · 6 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
15 papers more in this group
See all 19 papers →class · physiology: enzyme activity · Lathyrus oleraceus (pea)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- no effect
- negative
3 papers more in this group
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.