Models for oscillations in plants
Models for oscillations in plants
复制标题
植物振荡模型
DOI：
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
D. Gradmann
中科院分区：
文献类型：
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作者：
D. Gradmann
植物细胞的离子关系包括酶，如通道，泵和共转运蛋白，催化离子通过脂质膜的过渡，因此，影响膜电压。由于这些酶中的大多数的活性是电压依赖性的，这些酶通过电压变化彼此相互作用。这些相互作用的时间模式包括振荡。这里提出的模型，模拟这种振荡的离子转运的物理性质的基础上。模型A适用于短期事件。在模型B中，离子的外部浓度是恒定的。该模型适用于例如实验条件下的藻类和单细胞，显示了电振荡，正如模型A一样，但也显示了渗透振荡，其中内部离子浓度起着重要作用。最后，模型C适用于植物的薄壁细胞，其中离子通量穿过质膜引起主要的浓度变化的小质外体体积。在该模型中，考虑了离子的内部和外部缓冲。对于模型C，假设底物的总量是恒定的，并且其中的一部分在不同的隔室之间重新分配。模型C的振荡是相对罕见的。在大多数情况下，模型C接近K+处于热力学平衡的稳态。
Ionic relations of plant cells comprise enzymes such as channels, pumps and co-transporters that catalyse the transition of ions through lipid membranes and, therefore, affect the membrane voltage. Since the activity of most of these enzymes is voltage dependent, these enzymes interact with each other via voltage changes. The temporal patterns of these interactions include oscillations. Models are presented here that simulate such oscillations based on physical properties of the ion transporters. Three oscillating scenarios are focussed on. Model A is adequate for short-term episodes. In model B, the external concentration of the ions is constant. This model, which applies e.g. to algae and single cells under experimental conditions, displays electric oscillations, just as model A, but also osmotic oscillations in which the internal ion concentrations play an essential role. Finally, model C applies to parenchyma cells in planta, where ion fluxes across the plasmalemma cause major concentration changes in the small apoplastic volume. In this model, internal and external buffering of ions is accounted for. For model C, it is assumed that the total quantities of substrates are constant, and portions of them are redistributed between different compartments. Oscillations of the model C are relatively rare. In most cases, model C approaches a steady state where K+ is in thermodynamic equilibrium.
影响因子：
2.7
作者：
Messerli, MA;Créton, R;Robinson, KR
通讯作者：
Robinson, KR
影响因子：
3.4
作者：
Bier, M;Bakker, BM;Westerhoff, HV
通讯作者：
Westerhoff, HV