Abstract
Jasmonic acid (JA) and methyl jasmonate (MeJA), collectively termed jasmonates, are ubiquitous plant signalling compounds. Several types of stress conditions, such as wounding and pathogen infection, cause endogenous JA accumulation and the expression of jasmonate-responsive genes. Although jasmonates are important signalling components for the stress response in plants, the mechanism by which jasmonate signalling contributes to stress tolerance has not been clearly defined. A comprehensive analysis of jasmonate-regulated metabolic pathways in Arabidopsis was performed using cDNA macroarrays containing 13516 expressed sequence tags (ESTs) covering 8384 loci. The results showed that jasmonates activate the coordinated gene expression of factors involved in nine metabolic pathways belonging to two functionally related groups: (i) ascorbate and glutathione metabolic pathways, which are important in defence responses to oxidative stress, and (ii) biosynthesis of indole glucosinolate, which is a defence compound occurring in the Brassicaceae family. We confirmed that JA induces the accumulation of ascorbate, glutathione and cysteine and increases the activity of dehydroascorbate reductase, an enzyme in the ascorbate recycling pathway. These antioxidant metabolic pathways are known to be activated under oxidative stress conditions. Ozone (O3) exposure, a representative oxidative stress, is known to cause activation of antioxidant metabolism. We showed that O3 exposure caused the induction of several genes involved in antioxidant metabolism in the wild type. However, in jasmonate-deficient Arabidopsis 12-oxophytodienoate reductase 3 (opr3) mutants, the induction of antioxidant genes was abolished. Compared with the wild type, opr3 mutants were more sensitive to O3 exposure. These results suggest that the coordinated activation of the metabolic pathways mediated by jasmonates provides resistance to environmental stresses.
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Claims 7
Claim · model-written summary
Jasmonates activate coordinated gene expression of factors in nine metabolic pathways.
- Taxon
- Arabidopsis
Arabidopsist0 - Treatment
- jasmonatese1
- Outcome
- gene expression of factors involved in nine metabolic pathwayse1
- Direction
- activatee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e1“jasmonates activate the coordinated gene expression of factors involved in nine metabolic pathways”
Claim · model-written summary
JA induces accumulation of ascorbate, glutathione and cysteine in Arabidopsis.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- JAe2
- Compound
- ascorbate, glutathione and cysteinee2
- Outcome
- accumulatione2
- Direction
- inducese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e2“JA induces the accumulation of ascorbate, glutathione and cysteine”
Claim · model-written summary
JA increases the activity of dehydroascorbate reductase.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- JAe2
- Gene
- dehydroascorbate reductasee3
- Outcome
- activitye3
- Direction
- increasese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e2“JA induces the accumulation of ascorbate, glutathione and cysteine”
e3“increases the activity of dehydroascorbate reductase, an enzyme in the ascorbate recycling pathway”
Claim · model-written summary
O3 exposure induced several antioxidant metabolism genes in wild-type Arabidopsis.
- Taxon
- ArabidopsisArabidopsist0
- Material
- wild typee4
- Treatment
- O3 exposuree4
- Outcome
- induction of several genes involved in antioxidant metabolisme4
- Direction
- caused the inductione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e4“O3 exposure caused the induction of several genes involved in antioxidant metabolism in the wild type”
Claim · model-written summary
In opr3 mutants, O3-induced expression of antioxidant genes was abolished.
- Taxon
- ArabidopsisArabidopsist0
- Material
- opr3e5
- Treatment
- O3 exposuree4
- Gene
- 12-oxophytodienoate reductase 3e5
- Outcome
- induction of antioxidant genese5
- Direction
- abolishede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e4“O3 exposure caused the induction of several genes involved in antioxidant metabolism in the wild type”
e5“in jasmonate-deficient Arabidopsis 12-oxophytodienoate reductase 3 (opr3) mutants, the induction of antioxidant genes was abolished”
Claim · model-written summary
The opr3 mutants were more sensitive to O3 exposure than the wild type.
- Taxon
- ArabidopsisArabidopsist0
- Material
- opr3 mutantse6
- Treatment
- O3 exposuree6
- Outcome
- sensitive to O3 exposuree6
- Direction
- more sensitivee6
- Comparator
- wild typee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e6“Compared with the wild type, opr3 mutants were more sensitive to O3 exposure”
Claim · model-written summary
Coordinated activation of jasmonate-mediated metabolic pathways provides resistance to environmental stresses.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- resistance to environmental stressese7
- Qualifier
- coordinated activation of the metabolic pathways mediated by jasmonatese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Coordinated activation of metabolic pathways for antioxidants and defence compounds by jasmonates and their roles in stress tolerance in Arabidopsis”
e7“the coordinated activation of the metabolic pathways mediated by jasmonates provides resistance to environmental stresses”
The same questions in other papers
jasmonic acid · molecular: metabolites · ArabidopsisPositive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- negative
2 papers more in this group
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