CPK3/6 mediate ABA guard-cell signaling
Calcium-dependent kinases CPK3 and CPK6 act in ABA control of guard-cell anion/Ca²⁺ channels and stomatal closure.
Source
CDPKs CPK6 and CPK3 function in ABA regulation of guard cell S-type anion- and Ca(2+)-permeable channels and stomatal closure
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CPK3/6 mediate ABA guard-cell signaling
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34 CDPK genes in Arabidopsis.
There are 34 CDPK genes in the Arabidopsis genome [,].
CDPK family size?
There are 34 CDPK genes in the Arabidopsis genome
What they did
Identified guard-cell CDPKs, isolated cpk3/cpk6 mutants, and measured ion-channel and stomatal responses to ABA.
What they found
Among 34 Arabidopsis CDPKs, CPK3 and CPK6 function in ABA-activated S-type anion and Ca²⁺-permeable channels.
The limits
What it doesn't show
Does not map every CDPK substrate in all cell types.
Key terms
- CDPK
- Calcium-dependent protein kinase.
- ABA
- Abscisic acid stress hormone.
- Guard cell
- Cell pair forming the stomatal pore.
- S-type anion channel
- Slow anion channel for stomatal closure.
- CPK3/CPK6
- Guard-cell-expressed CDPK genes.
- Ca²⁺ signal
- Calcium second messenger in ABA signaling.
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CDPK genes:
Common questions
Arabidopsis CDPK gene count?
34.
Key genes?
CPK3 and CPK6.
Hormone?
ABA.
Outputs?
Anion/Ca²⁺ channels and stomatal closure.
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