Abstract
An Arabidopsis mutant line named hy1-101 was isolated because it shows stunted root growth on medium containing low concentrations of jasmonic acid (JA). Subsequent investigation indicated that even in the absence of JA, hy1-101 plants exhibit shorter roots and express higher levels of a group of JA-inducible defense genes. Here, we show that the hy1-101 mutant has increased production of JA and its jasmonate-related phenotype is suppressed by the coi1-1 mutation that interrupts JA signaling. Gene cloning and genetic complementation analyses revealed that the hy1-101 mutant contains a mutation in the HY1 gene, which encodes a heme oxygenase essential for phytochrome chromophore biosynthesis. These results support a hypothesis that phytochrome chromophore deficiency leads to overproduction of JA and activates COI1-dependent JA responses. Indeed, we show that, like hy1-101, independent alleles of the phytochrome chromophore-deficient mutants, including hy1-100 and hy2 (CS68), also show elevated JA levels and constant expression of JA-inducible defense genes. We further provide evidence showing that, on the other hand, JA inhibits the expression of a group of light-inducible and photosynthesis-related genes. Together, these data imply that the JA-signaled defense pathway and phytochrome chromophore-mediated light signaling might have antagonistic effects on each other.
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Claims 10
Claim · model-written summary
The hy1-101 mutant has shorter roots even in the absence of JA.
- Taxon
- Arabidopsis
Arabidopsist0 - Material
- hy1-101e1
- Outcome
- rootse1
- Direction
- shortere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e1“even in the absence of JA, hy1-101 plants exhibit shorter roots”
Claim · model-written summary
The hy1-101 mutant expresses higher levels of a group of JA-inducible defense genes.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- JA-inducible defense genese2
- Outcome
- expresse2
- Direction
- higher levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e2“express higher levels of a group of JA-inducible defense genes”
Claim · model-written summary
The hy1-101 mutant has increased production of jasmonic acid.
- Taxon
- ArabidopsisArabidopsist0
- Material
- hy1-101 mutante3
- Compound
- JAe3
- Outcome
- production of JAe3
- Direction
- increasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e3“the hy1-101 mutant has increased production of JA”
Claim · model-written summary
The coi1-1 mutation suppresses the jasmonate-related phenotype of hy1-101.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- coi1-1 mutatione4
- Outcome
- jasmonate-related phenotypee4
- Direction
- suppressede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e4“its jasmonate-related phenotype is suppressed by the coi1-1 mutation”
Claim · model-written summary
The hy1-101 mutant contains a mutation in the HY1 gene, which encodes a heme oxygenase.
- Taxon
- ArabidopsisArabidopsist0
- Material
- hy1-101e5
- Gene
- HY1e5
- Outcome
- contains a mutation in the HY1 genee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e5“the hy1-101 mutant contains a mutation in the HY1 gene, which encodes a heme oxygenase essential for phytochrome chromophore biosynthesis”
Claim · model-written summary
Phytochrome chromophore deficiency is hypothesized to lead to overproduction of JA and activation of COI1-dependent JA responses.
- Taxon
- ArabidopsisArabidopsist0
- Compound
- JAe6
- Outcome
- overproduction of JAe6
- Qualifier
- phytochrome chromophore deficiencye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e6“phytochrome chromophore deficiency leads to overproduction of JA and activates COI1-dependent JA responses”
Claim · model-written summary
Independent phytochrome chromophore-deficient alleles hy1-100 and hy2 (CS68) also show elevated JA levels.
- Taxon
- ArabidopsisArabidopsist0
- Material
- hy1-100 and hy2 (CS68)e7
- Outcome
- JA levelse7
- Direction
- elevatede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e7“independent alleles of the phytochrome chromophore-deficient mutants, including hy1-100 and hy2 (CS68), also show elevated JA levels”
Claim · model-written summary
Independent phytochrome chromophore-deficient alleles show constant expression of JA-inducible defense genes.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- JA-inducible defense genese1
- Outcome
- expression of JA-inducible defense genese1
- Direction
- constante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e1“constant expression of JA-inducible defense genes”
Claim · model-written summary
JA inhibits the expression of light-inducible and photosynthesis-related genes in Arabidopsis.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- JAe1
- Outcome
- expression of a group of light-inducible and photosynthesis-related genese1
- Direction
- inhibitse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e1“JA inhibits the expression of a group of light-inducible and photosynthesis-related genes”
Claim · model-written summary
The JA-signaled defense pathway and phytochrome chromophore-mediated light signaling may have antagonistic effects on each other.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- antagonistic effects on each othere1
- Qualifier
- the JA-signaled defense pathway and phytochrome chromophore-mediated light signalinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e1“the JA-signaled defense pathway and phytochrome chromophore-mediated light signaling might have antagonistic effects on each other”
The same questions in other papers
jasmonic acid · molecular: expression · ArabidopsisPositive and negative results
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