Abstract
Salt stresses strongly enhance the phosphoenolpyruvate carboxylase kinase (PEPC-k) activity of sorghum leaves. This work shows that (1) abscisic acid (ABA) increased the rise in kinase activity in illuminated leaf disks of the non-stressed plant, (2) ABA decreased the disappearance of PEPC-k activity in the dark, (3) two PEPC-k genes expressed in sorghum leaves, PPCK1 and PPCK2, were not up-regulated by the phytohormone and, (4) ABA effects were mimicked by MG132, a powerful inhibitor of the ubiquitin-proteasome pathway. Collectively these data support a role for the ubiquitin-proteasome pathway in the rapid turnover of PEPC-k. The negative control by ABA on this pathway might account for the increase of kinase activity observed in salt-treated plants.
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Claims 8
Claim · model-written summary
Salt stress strongly enhances PEPC-k activity in sorghum leaves.
- Organ / stage
- leavese0
- Treatment
- Salt stressese0
- Gene
- phosphoenolpyruvate carboxylase kinase (PEPC-k)e0
- Outcome
- phosphoenolpyruvate carboxylase kinase (PEPC-k) activitye0
- Direction
- strongly enhancee0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stresses strongly enhance the phosphoenolpyruvate carboxylase kinase (PEPC-k) activity of sorghum leaves”
Claim · model-written summary
ABA increased the rise in kinase activity in illuminated leaf disks of non-stressed sorghum.
- Organ / stage
- illuminated leaf diskse0
- Treatment
- abscisic acid (ABA)e0
- Outcome
- kinase activitye0
- Direction
- increasede0
- Comparator
- the non-stressed plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“abscisic acid (ABA) increased the rise in kinase activity in illuminated leaf disks of the non-stressed plant”
t0“sorghum”
Claim · model-written summary
ABA decreased disappearance of PEPC-k activity in the dark.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA decreased the disappearance of PEPC-k activity in the dark”
t0“sorghum”
Claim · model-written summary
ABA did not up-regulate PPCK1 expression in sorghum leaves.
- Organ / stage
- leavese0
- Treatment
- the phytohormonee0
- Gene
- PPCK1e0
- Outcome
- PPCK1e0
- Direction
- not up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two PEPC-k genes expressed in sorghum leaves, PPCK1 and PPCK2, were not up-regulated by the phytohormone”
Claim · model-written summary
ABA did not up-regulate PPCK2 expression in sorghum leaves.
- Organ / stage
- leavese0
- Treatment
- the phytohormonee0
- Gene
- PPCK2e0
- Outcome
- PPCK2e0
- Direction
- not up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two PEPC-k genes expressed in sorghum leaves, PPCK1 and PPCK2, were not up-regulated by the phytohormone”
Claim · model-written summary
MG132 mimicked the effects of ABA.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA effects were mimicked by MG132, a powerful inhibitor of the ubiquitin-proteasome pathway”
t0“sorghum”
Claim · model-written summary
The data support a role of the ubiquitin-proteasome pathway in rapid PEPC-k turnover.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Collectively these data support a role for the ubiquitin-proteasome pathway in the rapid turnover of PEPC-k”
t0“sorghum”
Claim · model-written summary
ABA negative control of that pathway may explain increased kinase activity in salt-treated plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The negative control by ABA on this pathway might account for the increase of kinase activity observed in salt-treated plants”
t0“sorghum”
The same questions in other papers
(+)-abscisic acid · molecular: metabolites · SorghumResults agree
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- positive
- positive
- positive
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See all 5 papers →salinity · molecular: metabolites · SorghumPositive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- negative
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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.