About the Project
The project will investigate the interaction between the fungal pathogen Zymoseptoria tritici (Zt) and its host plant wheat. Zt causes septoria tritici blotch (STB), the most damaging disease of wheat in Europe and one of the largest constraints on wheat production globally. The disease is especially serious in the UK because of conducive climatic conditions. It is becoming increasingly difficult to control STB, because Zt is capable of rapidly evolving resistance to fungicides and adapting to disease-resistant wheat varieties and environmental conditions. It is recognized that no single control measure is durable in the face of the pathogen’s notorious adaptive capacity, hence the two key control methods – fungicides and disease resistance genes in wheat – need to be combined in a manner that optimizes not only control efficacy in the short term, but also their sustainability in the longer term. This interdisciplinary project will make a major contribution to this goal using a powerful combination of large-scale field experimentation with novel high-throughput phenotyping techniques, bioinformatic analyses, state-of-the-art machine learning and mathematical modelling approaches.
In the first phase, a field experiment will be conducted during two consecutive years to investigate the STB epidemic development in a large number of different wheat genotypes. The amount of disease will be measured using both the conventional visual assessments and novel digital phenotyping approaches, and the daily weather data will be recorded. The data on epidemic development will be linked to genomic data already available for the wheat population under study, and in this way you are likely to identify new genetic bases of STB resistance in wheat. In the second phase, powerful machine learning techniques will be used to combine the three types of data (disease measurements, weather data and wheat genomic data) and construct a model predicting the seasonal STB epidemic development. Finally, in the third phase of the project, the outcomes of the two previous phases will be incorporated into a modelling framework (epidemiological/evolutionary model) that describes how the pathogen population changes over time in its interaction with the host population of wheat plants. The model will incorporate the effect of two control measures: fungicides and STB resistance genes in wheat. This will allow you to optimize choices of fungicide treatment programmes and disease-resistant wheat cultivars that maximize net benefit of growers over a short term of a single growing season. You will then be able to compare the outcomes with the predicted net benefit over a longer term of a number of consecutive growing seasons, taking into account disease levels, weather variables and wheat genomes. The outcomes will establish the scientific basis for the software product that growers can use to guide their choices regarding fungicide applications and wheat cultivars.
The student will acquire inter-disciplinary skills in designing and conducting large-scale field experiments with crop pathogens, acquiring large datasets with the help of novel digital phenotyping approaches, use machine learning and mathematical modelling to extract knowledge from data. The student will receive extensive training by the supervisory team in computer programming to handle large and complex data sets and conduct mathematical and computational modelling using Linux, Python and R. The student will have access to advanced computational infrastructures, such as the high-performance computing clusters available at Aberystwyth, and via Supercomputing Wales, and receive appropriate training in their usage. The student will be embedded within the extensive international collaborative network of the supervisory team that includes plant pathologists, genomics experts, modellers and practice-oriented researchers, enabling the student to make use of these diverse sets of expertise. A three-month placement with Syngenta will provide the student with the industry’s perspective on the project’s outcomes, expanding the range of possible employment options after the completion of the project. The unique combination of empirical, mathematical and computational skills as well as a valuable professional network developed in the course of the project will increase the student’s chances to find a high-profile job in academia, governmental agencies or industry.
The project would suit an ambitious student interested in combining experimentation in the field with mathematical and computational modelling of agri-food biosystems. The ideal candidate would have:
---An undergraduate or a Master’s degree in a either a quantitative discipline (such as physics, mathematics or computer science), biology or agricultural/environmental sciences
---Strong interest in biology applied to agriculture
---Strong interest in mathematical/computational modelling of biological processes
---Desire to link the models with real-world field experiments and spend equal proportions of time doing experimental research and modelling/computational research
---The ability and motivation to quickly learn new skills
Please note that experience in mathematical modelling or bioinformatics are important, but not essential, as extensive training will be offered in both. We encourage applications from diverse backgrounds.
The project is a CASE studentship partly funded by Syngenta Crop Protection (Switzerland). This will provide the student with the opportunity of a three-month placement with Syngenta towards the end of the project. This project is part of the FoodBioSystems BBSRC Doctoral Training Partnership (DTP), it will be funded subject to a competition to identify the strongest applicants.
The studentship is open to UK and international students (including EU countries) however due to funding rules, no more than 30% of the projects can be allocated to international students.
The funding will include a tax free stipend (minimum £15, 285 per year), support for tuition fees at the standard UK rate (currently £4,407 per year) and a contribution towards research costs. Please note that the host universities have not yet confirmed the level of fees charged to international students funded by the DTP. Fee levels may vary across the institutions. This information will be shared on the FoodBioSystems DTP website as soon as it becomes available.
Please go to FoodBioSystems DTP website for information on how to apply for this studentship. The closing date for applications will be 8 February 2021.
bioRxiv pre-print: https://doi.org/10.1101/354357.
Karisto, P., Hund, A., Yu, K., Anderegg, J., Walter, A., Mascher, F., McDonald, B.A., & Mikaberidze, A., 2018 Ranking quantitative resistance to Septoria tritici blotch in elite wheat cultivars using automated image analysis, Phytopathology, 108, 568–581.
Mikaberidze, A., Mundt, Ch. & Bonhoeffer, S., 2016 Invasiveness of plant pathogens depends on the spatial scale of host distribution, Ecological Applications, 26, 1238–1248, E-print arXiv:1410.0587.
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