A biophysical analysis of stem and root diameter variations in woody plants
A biophysical analysis of stem and root diameter variations in woody plants
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DOI：
10.1104/pp.126.1.188
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发表时间：
2001-05-01
期刊：
影响因子：
7.4
通讯作者：
Habib, R
中科院分区：
文献类型：
--
作者：
Génard, M;Fishman, S;Habib, R
建立了一个综合的茎、根直径变异模型。茎（或根）用两个同轴圆柱体表示，对应于成熟木质部和可伸展组织。可伸展的组织被认为是一个单一的细胞，与成熟的木质部分开的虚拟膜。成熟的木质部和可伸展的组织能够随着温度而扩张并生长。此外，可伸展的织物能够根据水流强度收缩和膨胀。该模型主要基于使用不可逆热力学原理描述的“单电池”中的水体积流量的计算。描述了贮量的弹性响应和伴随生长的塑性延伸。该模型模拟了由于温度、溶质积累、木质部和水势引起的直径变化。该模型被施加到桃（桃）干和李（李X李刺）根。模拟输出与观察到的直径变化良好对应。模型预测膨压和渗透势的变化小于木质部水势的变化。它还表明木质部水势，膨压，弹性模量和渗透势之间的相关性。在田间试验数据中观察到，直径与木质部水势之间的关系表现出潜在的滞后现象。使用模型参数的敏感性分析表明，增长和收缩是高度敏感的初始值的膨压和溶质的反射系数。收缩和增长敏感的弹性模量和壁屈服阈值压力，分别。该模型对温度变化不敏感。
A comprehensive model of stem and root diameter variation was developed. The stem (or root) was represented using two coaxial cylinders corresponding with the mature xylem and the extensible tissues. The extensible tissues were assumed to behave as a single cell separated from the mature xylem by a virtual membrane. The mature xylem and the extensible tissues are able to dilate with temperature and grow. Moreover, the extensible tissues are able to shrink and swell according to water flow intensity. The model is mainly based on the calculation of water volume flows in the "single cell" that are described using the principles of irreversible thermodynamics. The elastic response to storage volume and plastic extension accompanying growth are described. The model simulates diameter variation due to temperature, solute accumulation, and xylem, water potential. The model was applied to the peach (Prunus persica) stem and to the plum (Prunus domestica X Prunus spinosa) root. The simulation outputs corresponded well with the diameter variation observed. The model predicts that variations,of turgor pressure and osmotic potential are smaller than the variations of xylem water potential. It also demonstrates correlations between the xylem water potential, the turgor pressure, the elastic modulus, and the osmotic potential. The relationship between the diameter and the xylem water potential exhibits a subtential hysteresis, as observed in field data. A sensitivity analysis using the model parameters showed that growth and shrinkage were highly sensitive to the initial values of the turgor pressure and to the reflection coefficient of solutes. Shrinkage and growth were sensitive to elastic modulus and wall-yielding threshold pressure, respectively. The model was not sensitive to changes in temperature.