Karen Halliday

For plants, light is a signal that carries information about the environment, and a source of energy for photosynthesis. PHYTOCAL focuses on the interaction between phytochrome signalling and photosynthesis, and seeks to understand fundamental processes that make carbon (C) and nitrogen (N) resources available for plant growth. These unexplored connections underlie biomass production and plasticity, which contribute significantly to yield variability in the field.

This projects seeks to uncover how phytochrome signalling modulates leaf architecture

How light control development

The dataset presents mathematical models of the gene regulatory network of the circadian clock, in the plant Arabidopsis thaliana. The work will be published as Urquiza-Garcia, Molina, Halliday and Millar, title "Abundant clock proteins point to missing molecular regulation in the plant circadian clock", in Molecular Systems Biology, 2025.

Starting from the U2019.3 and U2020.3 models, this project rescales parameters to match protein levels that were predicted using a simple model from the TiMet ...

Data, models and simulations for the Chew et al. 2014 paper (PNAS, https://doi.org/10.1073/pnas.1410238111), using wild-type Arabidopsis ecotype Col-0 in standard 12hL:12hD growth conditions, compared to La(er) or Fei-0 accessions, or to plants overexpressing a micro RNA (miR156).

The reporter fusion constructs expressing clock proteins fused to NanoLUC or firefly FLUC were transformed into the cognate, clock-mutant host plants. Each host also contained a transcriptional FLUC fusion that was used to score the circadian period of each transgenic line in constant light. Transformants that expressed a functionally normal level of clock protein were selected by choosing lines that complemented the mutant's period defect back close to the wild type period. Note that the reporters ...