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- W1597173619 abstract "ABSTRACTFusarium head blight (FHB) and other Fusarium diseases of wheat and other small-graincereals cause yield reduction and grain contamination with harmful mycotoxins, mainlydeoxynivalenol (DON). Little is known about the mechanistic basis of resistance toFusarium in cereals due to the large, polyploid and unsequenced genome of wheat. Hostethylene (ET) signalling was previously shown to be a factor of susceptibility to FHB.Chapter 2 uses wheat EMS mutant lines characterized for altered senescence to test for arelationship between ET-sensitivity, senescence and resistance to FHB. Candidate mutantlines displaying high level of resistance to FHB were identified and resistance wasassociated with delayed senescence, reduced ET-sensitivity, or developmental delay.Brachypodium distachyon (Bd) has the potential to serve as a model pathosystem relevantto small-grain cereals. Chapter 3 provides evidence of compatibility between Bd and themain causal agents of FHB and shows that symptom development mirrors closely that inwheat. Natural variation in disease resistance exists among Bd accessions and a novel routefor initial infection is suggested. Bd is also compatible with other important pathogens ofsmall-grain cereals causing ramularia, eyespot and take-all diseases. In Chapter 4, apreliminary study of Bd T-DNA mutant lines altered in phytohormone biosynthesis orresponse investigates alteration of Fusarium resistance. Mutation of the mainbrassinosteroid (BR) receptor (BRI1) was characterized and validated. Other mutantsdefective in auxin or ET responsiveness and jasmonic acid (JA) biosynthesis wereinvestigated. Results suggest that JA and BRI1 promote disease susceptibility. Finally,Chapter 5 uses a chemical and genetic approach to investigate the mechanisms of DONphytotoxicity using the Bd root system. Effects induced by the mycotoxin are comparedwith BRs, inhibitors of protein synthesis and compounds altering BR biosynthesis orsignalling. Results suggest that DON may disrupt host BR homeostasis to promote diseasesusceptibility." @default.
- W1597173619 created "2016-06-24" @default.
- W1597173619 creator A5026531030 @default.
- W1597173619 date "2012-09-01" @default.
- W1597173619 modified "2023-09-27" @default.
- W1597173619 title "Brachypodium distachyon as a genetic model pathosystem to study resistance against fungal pathogens of small grain cereals" @default.
- W1597173619 hasPublicationYear "2012" @default.
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