Abstract
Treatmentofpeastemsegmentswithindoleacetic acid (IAA)causeswithin 1houra 2-to4-fold increase inactivity ofparticulate uridinediphosphoglucose-dependent a-glucan synthetase obtainable fromthetissue. TheIAA effect isobservable intissue fromallpartsoftheelongation zoneofthe peastem,andalsoinoldertissue thatisnotcapable ofa cell enlargement response toIAA.A largeincrease inactivity is caused byIAAonlyifsynthetase activity intheisolated tissue hasfirst beenallowed tofall substantially belowtheintact plant level, andonlyifsucrose issupplied along withIAA.Treatment oftissue withsucrose aloneafteraperiod ofsugarstarvation causesa transient riseofsynthetase activity. Thedecline in synthetase activity inabsence ofIAA,therisecausedbyIAA, and thetransient risecausedby sucroseare allstrongly temperature-dependent. IAA and sucrosedo not affect the activity ofisolated synthetase particles. Synthetase activity in vivoissensitive toaslowas0.1 IuM 1AAandisincreased by IAAanalogues thatareactive asauxins on elongation butnot bynonauxinanalogues. Activity begins torise10to15minutes after exposure to1AA,whichplaces thisamongthemostrapid enzymeeffects ofaplant growth regulator heretofore demonstrated, andamongthemostrapid knownmetabolic effects of auxins. Theeffect isseenalsowithpolysaccharide synthetase activity usinguridine diphosphate-galactose oruridine diphosphate-xylose assubstrates, andtoa lesser extentwithguanosinediphosphoglucose-dependent glucan synthetase activity. Glucansynthetase fromIAA-treated tissue appears tohavea higher affinity foruridine diphosphate-glucose thanthecontrol.
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Claims 12
Claim · model-written summary
IAA increased particulate UDP-glucose-dependent alpha-glucan synthetase activity two- to fourfold within one hour in pea stem segments.
- Taxon
- Pea
Lathyrus oleraceust0 - Treatment
- indoleacetic acid (IAA)e0
- Gene
- a-glucan synthetasee0
- Outcome
- particulate uridinediphosphoglucose-dependent a-glucan synthetasee0
- Direction
- increasee0
- Value
- 2-to4-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Treatmentofpeastemsegmentswithindoleacetic acid (IAA)causeswithin 1houra 2-to4-fold increase inactivity ofparticulate uridinediphosphoglucose-dependent a-glucan synthetase obtainable fromthetissue.”
Claim · model-written summary
IAA increased synthetase activity in all parts of the pea stem elongation zone and older tissue incapable of cell enlargement.
- Taxon
- PeaLathyrus oleraceust0
- Organ / stage
- allpartsoftheelongation zoneofthe peasteme0
- Treatment
- IAAe0
- Outcome
- synthetase activityt0
- Qualifier
- oldertissue thatisnotcapable ofa cell enlargement response toIAAe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“TheIAA effect isobservable intissue fromallpartsoftheelongation zoneofthe peastem,andalsoinoldertissue thatisnotcapable ofa cell enlargement response toIAA.”
Claim · model-written summary
A large IAA-induced synthetase activity increase required prior decline in isolated tissue activity and sucrose supply.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- synthetase activitye0
- Direction
- largeincreasee0
- Qualifier
- onlyifsucrose issupplied along withIAAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“A largeincrease inactivity is caused byIAAonlyifsynthetase activity intheisolated tissue hasfirst beenallowed tofall substantially belowtheintact plant level, andonlyifsucrose issupplied along withIAA.”
Claim · model-written summary
Sucrose alone transiently raised synthetase activity after sugar starvation.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- sucrose alonee0
- Outcome
- synthetase activitye0
- Direction
- transient risee0
- Qualifier
- afteraperiod ofsugarstarvatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Treatment oftissue withsucrose aloneafteraperiod ofsugarstarvation causesa transient riseofsynthetase activity.”
Claim · model-written summary
Temperature strongly affected the decline without IAA and the increases caused by IAA or sucrose.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- temperaturee0
- Outcome
- synthetase activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Thedecline in synthetase activity inabsence ofIAA,therisecausedbyIAA, and thetransient risecausedby sucroseare allstrongly temperature-dependent.”
Claim · model-written summary
IAA and sucrose did not affect activity of isolated synthetase particles.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- IAA and sucrosee0
- Outcome
- activity ofisolated synthetase particlese0
- Direction
- do not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“IAA and sucrosedo not affect the activity ofisolated synthetase particles.”
Claim · model-written summary
In vivo synthetase activity was sensitive to IAA concentrations as low as 0.1 IuM.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- 1AAe0
- Outcome
- Synthetase activity in vivoe0
- Value
- 0.1 IuMe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Synthetase activity in vivoissensitive toaslowas0.1 IuM 1AA”
Claim · model-written summary
Auxin-active analogues increased synthetase activity, whereas nonauxin analogues did not.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- IAAanalogues thatareactive asauxins on elongatione0
- Outcome
- Synthetase activityt0
- Direction
- increasede0
- Comparator
- nonauxinanaloguese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“isincreased by IAAanalogues thatareactive asauxins on elongation butnot bynonauxinanalogues.”
Claim · model-written summary
Synthetase activity began to rise 10 to 15 minutes after IAA exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Activity begins torise10to15minutes after exposure to1AA”
Claim · model-written summary
IAA also increased polysaccharide synthetase activity with UDP-galactose and UDP-xylose substrates.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- IAAe1
- Outcome
- polysaccharide synthetase activitye0
- Qualifier
- uridine diphosphate-galactose oruridine diphosphate-xylosee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Theeffect isseenalsowithpolysaccharide synthetase activity usinguridine diphosphate-galactose oruridine diphosphate-xylose assubstrates”
e1“Treatmentofpeastemsegmentswithindoleacetic acid (IAA)causeswithin 1houra 2-to4-fold increase inactivity ofparticulate uridinediphosphoglucose-dependent a-glucan synthetase obtainable fromthetissue.”
Claim · model-written summary
IAA had a lesser effect on GDP-glucose-dependent glucan synthetase activity.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- IAAe1
- Outcome
- guanosinediphosphoglucose-dependent glucan synthetase activitye0
- Direction
- lesser extente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“andtoa lesser extentwithguanosinediphosphoglucose-dependent glucan synthetase activity.”
e1“Treatmentofpeastemsegmentswithindoleacetic acid (IAA)causeswithin 1houra 2-to4-fold increase inactivity ofparticulate uridinediphosphoglucose-dependent a-glucan synthetase obtainable fromthetissue.”
Claim · model-written summary
Glucan synthetase from IAA-treated tissue appeared to have higher affinity for UDP-glucose than control tissue.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- IAA-treated tissuee0
- Outcome
- affinity foruridine diphosphate-glucosee0
- Direction
- highere0
- Comparator
- thecontrole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation off-Giucan Synthetase Activity by AuximinPeaStemTissue”
e0“Glucansynthetase fromIAA-treated tissue appears tohavea higher affinity foruridine diphosphate-glucose thanthecontrol.”
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
- no effect
- positive
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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
- negative
- no effect
- positive
2 papers more in this group
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.