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Feechan, Angela
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Feechan, Angela
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Feechan, Angela
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Now showing 1 - 5 of 5
- PublicationInternational Symposium on Cereal Leaf Blights (ISCLB) 2019: Book of Abstracts(University College Dublin, 2019-04-24)
; ; ; ; ; ; International Symposium on Cereal Leaf Blights is one of the most important conferences for the Cereal Blight Community including academics, researchers, agency partners and commercial breeders. The Symposium aims to bring together the whole research community - not just in academia but also in research centres and institutes and across government and agency organisations - with an interest in a wide variety of issues around cereal leaf blights. Over the course of three days, we participate in extensive debate and discussion across our seven Symposium topics: Evolution and Population Biology, Cultural management, fungicide resistance and epidemiology, Pathogen Functional Genetics and Genomics, Host-Pathogen Interactions, Host genetics and Resistance Breeding, Secondary Metabolism and Physiology and Special Topics.599 - PublicationSpot the difference on laurel leavesResearchers from TEAGASC and UCD are investigating disease issues in cherrylaurel, an important species for the Irish cut foliage sector.
88 - PublicationIsolate specific responses of the non-host grass Brachypodium distachyon to the fungal pathogen Zymoseptoria tritici, compared to wheat(American Phytopathological Society, 2021-02)
; ; ; ; ; Septoria tritici blotch (STB) is an important foliar disease of wheat that is caused by the fungal pathogen Zymoseptoria tritici. The grass Brachypodium distachyon has been used previously as a model system for cereal-pathogen interactions. In this study, we examined the non-host resistance (NHR) response of B. distachyon to two different Z. tritici isolates in comparison to wheat. These isolates vary in aggressiveness on wheat cv. Remus displaying significant differences in disease and pycnidia coverage. Using microscopy, we found that similar isolate specific responses were observed for H2O2 accumulation and cell death in both wheat and B. distachyon. Despite this, induction of isolate specific patterns of defence gene expression by Z. tritici did differ between B. distachyon and wheat. Our results suggest that phenylalanine ammonia lyase (PAL) expression may be important for NHR in B. distachyon while pathogenesis-related (PR) genes and expression of genes regulating reactive oxygen species (ROS) may be important to limit disease in wheat. Future studies of the B. distachyon-Z. tritici interaction may allow identification of conserved plant immunity targets which are responsible for the isolate specific responses observed in both plant species.176Scopus© Citations 1 - PublicationThe potential of Miscanthus to harbour known cereal pathogensMiscanthus holds great potential as a bioenergy crop and Ireland has ideal conditions for its cultivation, however limited information is available about the interactions between Miscanthus and soil fungi which are pathogenic to other crops grown in Ireland and the UK. Miscanthus may therefore be susceptible to soil-borne pathogens present in the soil prior to crop establishment or may harbour pathogens and facilitate transmission of disease to other crops. The response of Miscanthus to a number of fungal species was recorded to determine the vulnerability of Miscanthus to some of the most important cereal pathogens in Ireland. The microbial species were selected based on their presence in soil and their known pathogenicity towards cereal crops currently grown in Ireland. A number of fungi caused a significant level of infection on detached Miscanthus leaves: Rhizoctonia solani, Fusarium poae (Fusarium sporotrichiella var. poae) and Sordaria fimicola caused the greatest level of symptoms while Fusarium culmorum caused the greatest visual disease symptoms in living tissue during whole plant tests. The results suggest that Miscanthus is susceptible to a number of cereal fungal pathogens, and that of all the species investigated Fusarium species pose the greatest threat to Miscanthus plantings in Ireland. Fusarium is a known causative agent of blight in cereals, thus its ability to survive both on living and discarded Miscanthus tissue is important as it suggests that Miscanthus could act as a 'disease bridge' for cereal pathogens.
486Scopus© Citations 2 - PublicationA small secreted protein from Zymoseptoria tritici interacts with a wheat E3 ubiquitin to promote disease(Oxford University Press, 2021-02-02)
; ; ; ; ; ; ; ; Septoria Tritici Blotch, caused by the ascomycete fungus Zymoseptoria tritici, is a major threat to wheat production worldwide. The Z. tritici genome encodes many small, secreted proteins (ZtSSP) that likely play a key role in the successful colonisation of host tissues. However, few of these ZtSSPs have been functionally characterised for their role during infection. In this study, we identified and characterised a small, conserved cysteine-rich secreted effector from Zymoseptoria tritici which has homologues in other plant pathogens in the dothideomycetes. ZtSSP2 was expressed throughout Z. tritici infection in wheat with the highest levels observed early during infection. A yeast two-hybrid assay revealed an interaction between ZtSSP2 and wheat E3 ubiquitin ligase in yeast and this was further confirmed in planta using bimolecular fluorescence complementation, and co-immunoprecipitation. Down-regulation of this wheat E3 ligase using virus-induced gene silencing, increased the susceptibility of wheat to Septoria tritici blotch (STB). Together these results suggest that TaE3UBQ likely plays a role in plant immunity to defend against Z. tritici.99Scopus© Citations 4