Abstract
Although the role of auxin in biotrophic pathogenesis has been extensively studied, relatively little is known about its role in plant resistance to necrotrophs. Arabidopsis thaliana mutants defective in different aspects of the auxin pathway are generally more susceptible than wild-type plants to the necrotrophic pathogen Alternaria brassicicola. We show that A. brassicicola infection up-regulates auxin biosynthesis and down-regulates the auxin transport capacities of infected plants, these effects being partially dependent on JA signaling. We also show that these effects of A. brassicicola infection together lead to an enhanced auxin response in host plants. Application of IAA and MeJA together synergistically induces the expression of defense marker genes PDF1.2 (PLANT DEFENSIN 1.2) and HEL (HEVEIN-LIKE), suggesting that enhancement of JA-dependent defense signaling may be part of the auxin-mediated defense mechanism involved in resistance to necrotrophic pathogens. Our results provide molecular evidence supporting the hypothesis that JA and auxin interact positively in regulating plant resistance to necrotrophic pathogens and that activation of auxin signaling by JA may contribute to plant resistance to necrotrophic pathogens.
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Claims 7
Claim · model-written summary
Auxin-pathway mutants were generally more susceptible than wild type to A. brassicicola.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Material
- mutants defective in different aspects of the auxin pathwaye0
- Interactor
- Alternaria brassicicola
Alternaria brassicicolae0pathogen - Outcome
- susceptiblee0
- Direction
- more susceptiblee0
- Comparator
- wild-type plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis thaliana mutants defective in different aspects of the auxin pathway are generally more susceptible than wild-type plants to the necrotrophic pathogen Alternaria brassicicola.”
Claim · model-written summary
A. brassicicola infection increased auxin biosynthesis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- A. brassicicola infectione0
- Interactor
- A. brassicicolaAlternaria brassicicolae0pathogen
- Outcome
- auxin biosynthesise0
- Direction
- up-regulatese0
- Qualifier
- partially dependent on JA signalinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We show that A. brassicicola infection up-regulates auxin biosynthesis and down-regulates the auxin transport capacities of infected plants, these effects being partially dependent on JA signaling.”
t0“Arabidopsis thaliana”
Claim · model-written summary
A. brassicicola infection reduced auxin transport capacity.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- A. brassicicola infectione0
- Interactor
- A. brassicicolaAlternaria brassicicolae0pathogen
- Outcome
- auxin transport capacitiese0
- Direction
- down-regulatese0
- Qualifier
- partially dependent on JA signalinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We show that A. brassicicola infection up-regulates auxin biosynthesis and down-regulates the auxin transport capacities of infected plants, these effects being partially dependent on JA signaling.”
t0“Arabidopsis thaliana”
Claim · model-written summary
A. brassicicola infection enhanced host auxin response.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- A. brassicicola infectione0
- Interactor
- A. brassicicolaAlternaria brassicicolae0pathogen
- Outcome
- auxin responsee0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We also show that these effects of A. brassicicola infection together lead to an enhanced auxin response in host plants.”
t0“Arabidopsis thaliana”
Claim · model-written summary
IAA and MeJA together synergistically induced PDF1.2 expression.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- IAA and MeJA togethere0
- Gene
- PDF1.2e0
- Outcome
- expression of defense marker genes PDF1.2e0
- Direction
- synergistically inducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of IAA and MeJA together synergistically induces the expression of defense marker genes PDF1.2 (PLANT DEFENSIN 1.2) and HEL (HEVEIN-LIKE)”
t0“Arabidopsis thaliana”
Claim · model-written summary
IAA and MeJA together synergistically induced HEL expression.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- IAA and MeJA togethere0
- Gene
- HELe0
- Outcome
- expression of defense marker genes PDF1.2 (PLANT DEFENSIN 1.2) and HELe0
- Direction
- synergistically inducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of IAA and MeJA together synergistically induces the expression of defense marker genes PDF1.2 (PLANT DEFENSIN 1.2) and HEL (HEVEIN-LIKE)”
t0“Arabidopsis thaliana”
Claim · model-written summary
The authors infer positive interaction between JA and auxin in resistance regulation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Outcome
- plant resistance to necrotrophic pathogense0
- Direction
- positivelye0
- Qualifier
- JA and auxin interact positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JA and auxin interact positively in regulating plant resistance to necrotrophic pathogens and that activation of auxin signaling by JA may contribute to plant resistance to necrotrophic pathogens.”
t0“Arabidopsis thaliana”
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