Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures
Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures
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DOI：
10.1007/s11104-014-2188-4
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发表时间：
2014-11-01
期刊：
影响因子：
4.9
通讯作者：
Vereecken, Harry
中科院分区：
文献类型：
--
作者：
Huber, Katrin;Vanderborght, Jan;Vereecken, Harry
建立了一个模拟模型，通过耦合土壤水分流动的三维模型，模拟了土壤水势通过影响叶片水势和/或诱导根系产生化学信号来调节蒸腾作用，进入和通过根（Javaux等人，2008年）与化学品的木质部运输模型（作为局部根水势的函数产生）。气孔导度受模拟叶水势（H）和/或叶片化学信号浓度（C; H + C）的调节。分根实验模拟不同的蒸腾需求和灌溉placement.While调节气孔导度的化学运输是不稳定的和振荡的，模拟蒸腾随时间的推移和根系吸水从两个土壤室是相似的H和H + C的调节。增加气孔敏感性更强烈地降低蒸腾，降低阈值根水势（低于该化学信号产生）延迟蒸腾reduction.Although模拟与H + C调节定性再现蒸腾暴露于部分根区干燥（PRD）的植物，长期的影响似乎可以忽略不计。此外，大多数蒸腾响应PRD可以解释由水力信号单独。
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.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.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.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.