A sugar flow model predicts cell dynamics, weight and quality of tomato at varying sink-source ratios and temperatures

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ID: 319633
2026
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Abstract
A new tomato fruit model predicts cell numbers, cell sizes, sugar contents, and fresh weight. Transport of water and saccharides from plant stem to fruit cells is computed following biophysical rules. Saccharide fruit sink is based on sugar metabolism, rates of cell division and expansion, and starch and cell wall dynamics. Osmotic and hydraulic potentials in cells and their vacuoles drive water import at given cell-wall extensibility. The interaction of demand and transport determines saccharide flow and biomass. We incorporated physiological responses to temperature, pruning, and plant shading. Existing and new parameters were calibrated with data from fruit heating and fruit pruning experiments of contrasting tomato cultivars. Model validation for different strategies of fruit heating and pruning, and plant shading was successful. Increased fruit temperature was shown to reduce fruit weight, as expected. Growth response to fruit pruning or shading were fully explained by changes in phloem sucrose concentration. Hydraulic conductivity of vascular tissue as well as sucrose and hexose carrier capacities were crucial fruit properties determining sugar flux. Model scenarios on knockdown of sucrose synthase and active hexose uptake affected sugar composition. The model creates an important step towards predicting fruit quality and taste under diverse growth conditions.
Reference Key
openalex_W7167375634 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Pieter H B De Visser, Jaap Molenaar, Paul C. Struik
Journal Journal of experimental botany
Year 2026
DOI
10.1093/jxb/erag331
URL
https://doi.org/10.1093/jxb/erag331
Keywords Keywords not found

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