Linking water stress effects on carbon partitioning by introducing a xylem circuit into L-PEACH |
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Authors: | Da Silva David Favreau Romeo Auzmendi Iñigo DeJong Theodore M |
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Institution: | 1Department of Plant Sciences, University of California Davis, One Shields Avenue, Davis, CA 95616, USA;2Irrigation Technology, Institut de Recerca i Tecnologia Agroalimentàries, 191 Avda Rovira Roure, Lleida 25198, Spain |
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Abstract: | Background and AimsMany physiological processes such as photosynthesis, respiration and transpiration can be strongly influenced by the diurnal patterns of within-tree water potential. Despite numerous experiments showing the effect of water potential on fruit-tree development and growth, there are very few models combining carbohydrate allocation with water transport. The aim of this work was to include a xylem circuit into the functional–structural L-PEACH model.MethodsThe xylem modelling was based on an electrical circuit analogy and the Hagen–Poisseuille law for hydraulic conductance. Sub-models for leaf transpiration, soil water potential and the soil–plant interface were also incorporated to provide the driving force and pathway for water flow. The model was assessed by comparing model outputs to field measurements and published knowledge.Key ResultsThe model was able to simulate both the water uptake over a season and the effect of different irrigation treatments on tree development, growth and fruit yield.ConclusionsThis work opens the way to a new field of modelling where complex interactions between water transport, carbohydrate allocation and physiological functions can be simulated at the organ level and describe functioning and behaviour at the tree scale. |
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Keywords: | Carbon allocation water stress xylem functional–structural plant modelling plant growth simulation L-PEACH |
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