Abstract
Plant stomata limit both carbon dioxide uptake and water loss; hence, stomatal aperture is carefully set as the environment fluctuates. Aperture area is known to be regulated in part by ion transport, but few of the transporters have been characterized. Here we report that AtALMT12 (At4g17970), a homolog of the aluminum-activated malate transporter (ALMT) of wheat, is expressed in guard cells of Arabidopsis thaliana. Loss-of-function mutations in AtALMT12 impair stomatal closure induced by ABA, calcium and darkness, but do not abolish either the rapidly activated or the slowly activated anion currents previously identified as being important for stomatal closure. Expressed in Xenopus oocytes, AtALMT12 facilitates chloride and nitrate currents, but not those of organic solutes. Therefore, we conclude that AtALMT12 is a novel class of anion transporter involved in stomatal closure.
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Claims 8
Claim · model-written summary
AtALMT12 is expressed in Arabidopsis guard cells.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Organ / stage
- guard cellse0
- Gene
- AtALMT12e0
- Outcome
- is expressed in guard cellse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AtALMT12 (At4g17970), a homolog of the aluminum-activated malate transporter (ALMT) of wheat, is expressed in guard cells of Arabidopsis thaliana”
Claim · model-written summary
AtALMT12 loss of function impairs ABA-induced stomatal closure.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- Loss-of-function mutationse0
- Gene
- AtALMT12e0
- Outcome
- stomatal closuree0
- Direction
- impaire0
- Qualifier
- ABAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Loss-of-function mutations in AtALMT12 impair stomatal closure induced by ABA, calcium and darkness”
e1“Arabidopsis thaliana”
Claim · model-written summary
AtALMT12 loss of function impairs calcium-induced stomatal closure.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- Loss-of-function mutationse0
- Gene
- AtALMT12e0
- Outcome
- stomatal closuree0
- Direction
- impaire0
- Qualifier
- calciume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Loss-of-function mutations in AtALMT12 impair stomatal closure induced by ABA, calcium and darkness”
e1“Arabidopsis thaliana”
Claim · model-written summary
AtALMT12 loss of function impairs darkness-induced stomatal closure.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- Loss-of-function mutationse0
- Gene
- AtALMT12e0
- Outcome
- stomatal closuree0
- Direction
- impaire0
- Qualifier
- darknesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Loss-of-function mutations in AtALMT12 impair stomatal closure induced by ABA, calcium and darkness”
e1“Arabidopsis thaliana”
Claim · model-written summary
AtALMT12 loss of function did not abolish rapidly or slowly activated anion currents.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae2
- Treatment
- Loss-of-function mutationse1
- Gene
- AtALMT12e1
- Outcome
- rapidly activated or the slowly activated anion currentse0
- Direction
- do not abolishe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but do not abolish either the rapidly activated or the slowly activated anion currents”
e1“Loss-of-function mutations in AtALMT12”
e2“Arabidopsis thaliana”
Claim · model-written summary
AtALMT12 expression in Xenopus oocytes facilitated chloride and nitrate currents.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- AtALMT12e0
- Outcome
- chloride and nitrate currentse0
- Direction
- facilitatese0
- Setting
- Xenopus oocytese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expressed in Xenopus oocytes, AtALMT12 facilitates chloride and nitrate currents”
e1“Arabidopsis thaliana”
Claim · model-written summary
AtALMT12 expression in Xenopus oocytes did not facilitate organic solute currents.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae2
- Gene
- AtALMT12e1
- Outcome
- those of organic solutese0
- Setting
- Xenopus oocytese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not those of organic solutes”
e1“Expressed in Xenopus oocytes, AtALMT12 facilitates chloride and nitrate currents, but not those of organic solutes”
e2“Arabidopsis thaliana”
Claim · model-written summary
The authors conclude AtALMT12 is an anion transporter class involved in stomatal closure.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- AtALMT12e0
- Outcome
- involved in stomatal closuree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AtALMT12 is a novel class of anion transporter involved in stomatal closure”
e1“Arabidopsis thaliana”
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See all 76 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.