Abstract
Fusarium Head Blight is a disease of cereal crops caused by a group of trichothecene-producing Fusarium species. Two major forms of resistance to Fusarium Head Blight are Type I resistance (resistance to initial infection) and Type II resistance (resistance to disease spread). Using functional genomics approaches, the effect of FHB-elicitors on the defense response of three wheat genotypes that share the susceptible cv. 'Superb' pedigree were evaluated. Distinct differences were observed between the resistant genotypes and 'Superb', as well as between the Type I and Type II genotypes. The data presented in this thesis suggests that different molecular mechanisms exist not only between susceptibility and resistance responses, but also between different forms of genetic resistance. It is proposed here that Type I resistance involves a combination of structural features that slow fungal penetration and the activation of a systemic response in uninfected tissues adjacent to the site of infection to prevent and minimize secondary infection; whereas, Type II resistance is more likely a form of local resistance. Based on the results from the functional genomics study, follow up experiments where wheat heads were primed with FHB elictiors and subsequently inoculated with a virulent F. graminearum strain and evaluated for changes in disease outcomes, support the hypothesis that Type I resistance involves the activation of a systemic response. Furthermore, an analysis of the role of plant hormone signalling using a combination of genetic and biochemical analysis suggest that jasmonic acid signalling is involved in Fusarium Head Blight resistance.
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Claims 6
Claim · model-written summary
Resistant wheat genotypes differed from susceptible Superb in defense responses.
- Taxon
- wheat
Triticum aestivumt0 - Material
- resistant genotypese0
- Outcome
- Distinct differencese0
- Comparator
- 'Superb'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Distinct differences were observed between the resistant genotypes and 'Superb', as well as between the Type I and Type II genotypes.”
t0“wheat”
Claim · model-written summary
Type I and Type II wheat genotypes had distinct defense responses.
- Taxon
- wheatTriticum aestivumt0
- Material
- Type Ie0
- Outcome
- Distinct differencese0
- Comparator
- Type IIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Distinct differences were observed between the resistant genotypes and 'Superb', as well as between the Type I and Type II genotypes.”
t0“wheat”
Claim · model-written summary
Type I resistance was proposed to involve structures that slow fungal penetration and a systemic response.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- fungale0pathogen
- Outcome
- Type I resistancee0
- Qualifier
- activation of a systemic responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is proposed here that Type I resistance involves a combination of structural features that slow fungal penetration and the activation of a systemic response in uninfected tissues adjacent to the site of infection to prevent and minimize secondary infection”
t0“wheat”
Claim · model-written summary
Type II resistance was proposed to be local resistance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- Type II resistancee0
- Qualifier
- local resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Type II resistance is more likely a form of local resistance.”
t0“wheat”
Claim · model-written summary
Priming and inoculation experiments supported a systemic response in Type I resistance.
- Taxon
- wheatTriticum aestivume0
- Treatment
- primed with FHB elictiorse0
- Interactor
- F. graminearum
_on_Corn_(Zea_mays)_at_Waimea%2C_Hawaii.jpg?width=60)
Fusarium graminearume0pathogen - Outcome
- activation of a systemic responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_on_Corn_(Zea_mays)_at_Waimea%2C_Hawaii.jpg?width=500)
Verbatim
e0“follow up experiments where wheat heads were primed with FHB elictiors and subsequently inoculated with a virulent F. graminearum strain and evaluated for changes in disease outcomes, support the hypothesis that Type I resistance involves the activation of a systemic response.”
Claim · model-written summary
Genetic and biochemical analyses implicated jasmonic acid signalling in Fusarium head blight resistance.
- Taxon
- wheatTriticum aestivumt0
- Compound
- jasmonic acide0
- Outcome
- Fusarium Head Blight resistancee0
FusariumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an analysis of the role of plant hormone signalling using a combination of genetic and biochemical analysis suggest that jasmonic acid signalling is involved in Fusarium Head Blight resistance.”
t0“wheat”