Abstract
Abscisic acid (ABA) is known to suppress seed germination and post-germinative growth of Arabidopsis (Arabidopsis thaliana), and jasmonate (JA) enhances ABA function. However, the molecular mechanism underlying the crosstalk between the ABA and JA signaling pathways remains largely elusive. Here, we show that exogenous coronatine, a JA analog structurally similar to the active conjugate jasmonate-isoleucine, significantly enhances the delayed seed germination response to ABA. Disruption of the JA receptor CORONATINE INSENSITIVE1 or accumulation of the JA signaling repressor JASMONATE ZIM-DOMAIN (JAZ) reduced ABA signaling, while jaz mutants enhanced ABA responses. Mechanistic investigations revealed that several JAZ repressors of JA signaling physically interact with ABSCISIC ACID INSENSITIVE3 (ABI3), a critical transcription factor that positively modulates ABA signaling, and that JAZ proteins repress the transcription of ABI3 and ABI5. Further genetic analyses showed that JA activates ABA signaling and requires functional ABI3 and ABI5. Overexpression of ABI3 and ABI5 simultaneously suppressed the ABA-insensitive phenotypes of the coi1-2 mutant and JAZ-accumulating (JAZ-ΔJas) plants. Together, our results reveal a previously uncharacterized signaling module in which JAZ repressors of the JA pathway regulate the ABA-responsive ABI3 and ABI5 transcription factors to integrate JA and ABA signals during seed germination and post-germinative growth.
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Claims 10
Claim · model-written summary
Coronatine enhanced ABA-delayed seed germination.
- Taxon
- Arabidopsis
Arabidopsist0 - Organ / stage
- seed germinatione0
- Treatment
- exogenous coronatinee0
- Outcome
- delayed seed germination response to ABAe0
- Direction
- enhancese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous coronatine, a JA analog structurally similar to the active conjugate jasmonate-isoleucine, significantly enhances the delayed seed germination response to ABA”
t0“Arabidopsis”
Claim · model-written summary
Disruption of CORONATINE INSENSITIVE1 reduced ABA signaling.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Disruption of the JA receptor CORONATINE INSENSITIVE1e0
- Gene
- CORONATINE INSENSITIVE1e0
- Outcome
- ABA signalinge0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disruption of the JA receptor CORONATINE INSENSITIVE1 or accumulation of the JA signaling repressor JASMONATE ZIM-DOMAIN (JAZ) reduced ABA signaling”
t0“Arabidopsis”
Claim · model-written summary
Accumulation of JAZ reduced ABA signaling.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- accumulation of the JA signaling repressor JASMONATE ZIM-DOMAIN (JAZ)e0
- Gene
- JASMONATE ZIM-DOMAIN (JAZ)e0
- Outcome
- ABA signalinge0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation of the JA signaling repressor JASMONATE ZIM-DOMAIN (JAZ) reduced ABA signaling”
t0“Arabidopsis”
Claim · model-written summary
jaz mutants enhanced ABA responses.
- Taxon
- ArabidopsisArabidopsist0
- Material
- jaz mutantse0
- Outcome
- ABA responsese0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“jaz mutants enhanced ABA responses”
t0“Arabidopsis”
Claim · model-written summary
JAZ repressors physically interact with ABI3.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- JAZ repressorse0
- Outcome
- physically interact with ABSCISIC ACID INSENSITIVE3 (ABI3)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“several JAZ repressors of JA signaling physically interact with ABSCISIC ACID INSENSITIVE3 (ABI3)”
t0“Arabidopsis”
Claim · model-written summary
JAZ proteins repress ABI3 transcription.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- JAZ proteinse0
- Outcome
- transcription of ABI3e0
- Qualifier
- represse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JAZ proteins repress the transcription of ABI3 and ABI5”
t0“Arabidopsis”
Claim · model-written summary
JAZ proteins repress ABI5 transcription.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- JAZ proteinse0
- Outcome
- ABI5e0
- Qualifier
- represse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JAZ proteins repress the transcription of ABI3 and ABI5”
t0“Arabidopsis”
Claim · model-written summary
JA activation of ABA signaling requires ABI3 and ABI5.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- ABI3 and ABI5e0
- Outcome
- ABA signalinge0
- Qualifier
- requires functional ABI3 and ABI5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JA activates ABA signaling and requires functional ABI3 and ABI5”
t0“Arabidopsis”
Claim · model-written summary
ABI3 and ABI5 overexpression suppressed ABA-insensitive phenotypes in coi1-2.
- Taxon
- ArabidopsisArabidopsist0
- Material
- coi1-2 mutante0
- Treatment
- Overexpression of ABI3 and ABI5e0
- Outcome
- ABA-insensitive phenotypese0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overexpression of ABI3 and ABI5 simultaneously suppressed the ABA-insensitive phenotypes of the coi1-2 mutant and JAZ-accumulating (JAZ-ΔJas) plants”
t0“Arabidopsis”
Claim · model-written summary
ABI3 and ABI5 overexpression suppressed ABA-insensitive phenotypes in JAZ-accumulating plants.
- Taxon
- ArabidopsisArabidopsist0
- Material
- JAZ-accumulating (JAZ-ΔJas) plantse0
- Treatment
- Overexpression of ABI3 and ABI5e0
- Outcome
- ABA-insensitive phenotypese0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overexpression of ABI3 and ABI5 simultaneously suppressed the ABA-insensitive phenotypes of the coi1-2 mutant and JAZ-accumulating (JAZ-ΔJas) plants”
t0“Arabidopsis”
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