caa a22 4500 606220054 CHVBK 20210128101121.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s11104-015-2502-9 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2502-9 Simulating transpiration and leaf water relations in response to heterogeneous soil moisture and different stomatal control mechanisms [Elektronische Daten] [Katrin Huber, Jan Vanderborght, Mathieu Javaux, Harry Vereecken] Aims: Stomata can close to avoid cavitation under decreased soil water availability. This closure can be triggered by hydraulic (‘H') and/or chemical signals (‘C', ‘H + C'). By combining plant hydraulic relations with a model for stomatal conductance, including chemical signalling, our aim was to derive direct relations that link soil water availability, expressed as fraction of roots in dry soil (fdry), to transpiration reduction. Methods: We used the mechanistic soil-root water flow model R-SWMS to verify this relation. Virtual split root experiments were simulated, comparing horizontal and vertical splits with varying fdry and different strengths of stomatal regulation by chemical and hydraulic signals. Results: Transpiration reduction predicted by the direct relations was in good agreement with numerical simulations. For small enough potential transpiration and large enough root hydraulic conductivity and stomatal sensitivity to chemical signalling isohydric plant behaviour originates from H + C control whereas anisohydric behaviour emerges from C control. For C control the relation between transpiration reduction and fdry becomes independent of transpiration rate whereas H + C control results in stronger reduction for higher transpiration rates. Conclusion: Direct relations that link effective soil water potential and leaf water potential can describe different stomatal control resulting in contrasting behaviour. Springer International Publishing Switzerland, 2015 Soil-root modelling nationallicence R-SWMS nationallicence Chemical signalling nationallicence Stomatal conductance nationallicence Partial root zone drying nationallicence Isohydric anisohydric nationallicence Stress control nationallicence Huber Katrin Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut Vanderborght Jan Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut Javaux Mathieu Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut Vereecken Harry Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut Plant and Soil Springer International Publishing 394/1-2(2015-09-01), 109-126 0032-079X 394:1-2<109 2015 394 11104 https://doi.org/10.1007/s11104-015-2502-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2502-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huber Katrin Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut NATIONALLICENCE 700 1- Vanderborght Jan Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut NATIONALLICENCE 700 1- Javaux Mathieu Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut NATIONALLICENCE 700 1- Vereecken Harry Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 394/1-2(2015-09-01), 109-126 0032-079X 394:1-2<109 2015 394 11104