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| Hauptseite > Publikationsdatenbank > Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures > print |
| Hauptseite > Publikationsdatenbank > Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures > print |
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| 024 | 7 | _ | |a 10.1007/s11104-014-2188-4 |2 doi |
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| 100 | 1 | _ | |a Huber, Katrin |0 P:(DE-Juel1)144686 |b 0 |e Corresponding Author |u fzj |
| 245 | _ | _ | |a Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures |
| 260 | _ | _ | |a Dordrecht [u.a.] |c 2014 |b Springer Science + Business Media B.V |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1414424101_32638 |2 PUB:(DE-HGF) |
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| 520 | _ | _ | |a Aims: A simulation model to demonstrate that soil water potential can regulate transpiration, by influencing leaf water potential and/or inducing root production of chemical signals that are transported to the leaves.Methods: Signalling impacts on the relationship between soil water potential and transpiration were simulated by coupling a 3D model for water flow in soil, into and through roots (Javaux et al.2008) with a model for xylem transport of chemicals (produced as a function of local root water potential). Stomatal conductance was regulated by simulated leaf water potential (H) and/or foliar chemical signal concentrations (C; H+C). Split-root experiments were simulated by varying transpiration demands and irrigation placement.Results: While regulation of stomatal conductance by chemical transport was unstable and oscillatory, simulated transpiration over time and root water uptake from the two soil compartments were similar for both H and H+C regulation. Increased stomatal sensitivity more strongly decreased transpiration, and decreased threshold root water potential (below which a chemical signal is produced) delayed transpiration reduction. Conclusions: Although simulations with H+C regulation qualitatively reproduced transpiration of plants exposed to partial rootzone drying (PRD), long-term effects seemed negligible. Moreover, most transpiration responses to PRD could be explained by hydraulic signalling alone. |
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| 773 | _ | _ | |a 10.1007/s11104-014-2188-4 |0 PERI:(DE-600)1478535-3 |n 1-2 |p 93-112 |t Plant and soil |v 384 |y 2014 |x 1573-5036 |
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