Abstract
Abstract Root cells take up K + from the soil solution, and a fraction of the absorbed K + is translocated to the shoot after being loaded into xylem vessels. K + uptake and translocation are spatially separated processes. K + uptake occurs in the cortex and epidermis whereas K + translocation starts at the stele. Both uptake and translocation processes are expected to be linked, but the connection between them is not well characterized. Here, we studied K + uptake and translocation using Rb + as a tracer in wild‐type Arabidopsis thaliana and in T‐DNA insertion mutants in the K + uptake or translocation systems. The relative amount of translocated Rb + to the shoot was positively correlated with net Rb + uptake rates, and the akt1 athak5 T‐DNA mutant plants were more efficient in their allocation of Rb + to shoots. Moreover, a mutation of SKOR and a reduced plant transpiration prevented the full upregulation of AtHAK5 gene expression and Rb + uptake in K + ‐starved plants. Lastly, Rb + was found to be retrieved from root xylem vessels, with AKT1 playing a significant role in K + ‐sufficient plants. Overall, our results suggest that K + uptake and translocation are tightly coordinated via signals that regulate the expression of K + transport systems.
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Claims 9
Claim · model-written summary
Relative shoot Rb translocation was positively correlated with net Rb uptake.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae1 - Organ / stage
- shoote0
- Outcome
- relative amount of translocated Rb +e0
- Direction
- positively correlatede0
- Qualifier
- net Rb + uptake ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative amount of translocated Rb + to the shoot was positively correlated with net Rb + uptake rates”
e1“Arabidopsis thaliana”
Claim · model-written summary
The akt1 athak5 mutant allocated Rb more efficiently to shoots.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Material
- akt1 athak5 T‐DNA mutant plantse0
- Outcome
- allocation of Rb + to shootse0
- Direction
- more efficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“akt1 athak5 T‐DNA mutant plants were more efficient in their allocation of Rb + to shoots”
e1“Arabidopsis thaliana”
Claim · model-written summary
SKOR mutation prevented full AtHAK5 expression upregulation in potassium-starved plants.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- a mutation of SKORe0
- Gene
- AtHAK5e0
- Outcome
- AtHAK5 gene expressione0
- Direction
- prevented the full upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a mutation of SKOR and a reduced plant transpiration prevented the full upregulation of AtHAK5 gene expression and Rb + uptake in K + ‐starved plants”
e1“Arabidopsis thaliana”
Claim · model-written summary
SKOR mutation prevented full Rb uptake upregulation in potassium-starved plants.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- a mutation of SKORe0
- Outcome
- Rb + uptakee0
- Direction
- prevented the full upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a mutation of SKOR and a reduced plant transpiration prevented the full upregulation of AtHAK5 gene expression and Rb + uptake in K + ‐starved plants”
e1“Arabidopsis thaliana”
Claim · model-written summary
Reduced transpiration prevented full AtHAK5 expression upregulation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- reduced plant transpiratione0
- Gene
- AtHAK5e0
- Outcome
- AtHAK5 gene expressione0
- Direction
- prevented the full upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduced plant transpiration prevented the full upregulation of AtHAK5 gene expression and Rb + uptake in K + ‐starved plants”
e1“Arabidopsis thaliana”
Claim · model-written summary
Reduced transpiration prevented full Rb uptake upregulation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- reduced plant transpiratione0
- Outcome
- Rb + uptakee0
- Direction
- prevented the full upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduced plant transpiration prevented the full upregulation of AtHAK5 gene expression and Rb + uptake in K + ‐starved plants”
e1“Arabidopsis thaliana”
Claim · model-written summary
Rb was retrieved from root xylem vessels.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Organ / stage
- root xylem vesselse0
- Outcome
- Rb + was found to be retrievede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rb + was found to be retrieved from root xylem vessels”
e1“Arabidopsis thaliana”
Claim · model-written summary
AKT1 played a significant role in Rb retrieval under sufficient potassium.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae2
- Gene
- AKT1e0
- Outcome
- Rb + was found to be retrievede1
- Qualifier
- K + ‐sufficient plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with AKT1 playing a significant role in K + ‐sufficient plants”
e1“Rb + was found to be retrieved from root xylem vessels”
e2“Arabidopsis thaliana”
Claim · model-written summary
The authors infer coordination of potassium uptake and translocation through regulation of transport systems.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Outcome
- K + uptake and translocation are tightly coordinatede0
- Qualifier
- signals that regulate the expression of K + transport systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K + uptake and translocation are tightly coordinated via signals that regulate the expression of K + transport systems”
e1“Arabidopsis thaliana”
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