Oct 17, 2023 | News

Studying photosynthetic  metabolism using a bespoke freeze clamp device 

Dive into the world of cutting-edge plant research in CAPITALISE project at University of Essex to see how we study our crops photosynthetic metabolism using a bespoke freeze clamp device.

Freezing and quenching leaf samples as quickly as possible is essential for accurate study of photosynthesis intermediate metabolites. This ensures we can stop metabolic processes immediately without changes in light or air quality, preventing the degradation of fast turn-over metabolites. It helps to maintain data accuracy and ensure experimental reproducibility. The clamp allows us to freeze leaf material within a few milliseconds. This sampling method preserves the metabolites in their original state, allowing researchers to analyse the processes accurately. Watch our freeze clamp device in action here.

Why are we doing this and what do we do with this data?

By freeze clamping the leaf we obtain a snapshot of the Calvin Benson cycle (CBC) intermediate metabolites in the leaf at that exact moment of clamping.  We use a bespoke set up from our partner at Wageningen which allows experimentation at different light intensity and air quality (e.g. high or low CO2/O2, 13CO2 labelling)   Selected metabolites in the leaf tissue are then carefully extracted and analysed.  Metabolomics data are then used to create and validate high quality large scale kinetic models of photosynthesis.  Accurate kinetic models will allow us to see how different factors affect key properties of photosynthesis and allow prediction and in silico testing of a range of parameters to fine-tune photosynthesis.  These models can help design future high performing crops.

Leaves of tomato (Solanum lycopersicum Money Maker – left) and barley (Hordeum vulgare Golden Promise – right) plants acclimating in the chamber (left) and after being clamped (right). The chamber is sealed with a delicate rubber gasket to prevent any damage to the leaves, and it incorporates transparent plastic films at the top and bottom to allow the passage of light. A gas pump is employed to maintain internal pressure, thereby preventing any infiltration from the external environment.

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