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Synchronising Potato Tuber Initiation with Transient Hormone Control to Improve Size Uniformity
Secondary Supervisor(s): Dr Alexander Watson-Lazowski, Dr Joe Roberts
University of Registration: Harper Adams University
BBSRC Research Themes:
Project Outline
Uniform tuber size in a harvest adds value in potato supply chains. The size distribution is partially determined by the hierarchy with which stolon tips switch into tubers during growth. If many make this switch in a short window, the resulting tuber cohort grows more evenly. This project tests a two-step approach to encourage this synchrony without yield sacrifice.
Step 1 is a reversible treatment with a transient strigolactone (SL) inhibitor to encourage simultaneous bud activity at stolon tips without lasting side effects. Step 2 applies a gibberellin (GA) regulator timed after the SL inhibitor's activity tapers off, to boost tuber size by skewing carbohydrate partitioning to the tubers.
The project will: (1) find the minimum effective SL inhibitor dose and timing; (2) test whether later GA moderation preserves or improves marketable yield; and (3) build predictive models for tuber initiation timing from early growth data.
Operating across rhizotrons, glasshouse and polytunnel trials, the researcher will leverage computer vision to record tuber formation non-destructively, gene expression tests (RT-qPCR) to track StSP6A (a tuberigen) and StGA2ox1 (a marker of GA activity), while targeted chemical assays will quantify SL and GA activity. Canopy photogrammetry and spectroscopy will quantify phenology and photosynthesis.
Data from all phases will be used to test the hypotheses, but also feed a causal machine learning model, to predict days to peak tuber formation from crop phenology. The outcome will be practical timing models and an evidence-base for manipulating apical dominance to manage synchrony in tuber initiation and growth. The researcher will be trained into a multifaceted crop physiologist with strong analytical skills, data science, and crop modelling competencies, with digital phenotyping and molecular analytics experience.