Temperature sensing by plants: Calcium-permeable channels as primary sensors - A model
Temperature sensing by plants: Calcium-permeable channels as primary sensors - A model
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DOI：
10.1007/s002329900590
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发表时间：
1999-11-15
影响因子：
2.4
通讯作者：
Plieth, C
中科院分区：
文献类型：
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作者：
Plieth, C
最近，Plieth等人已经通过实验证明了植物中的温度感测特性（The Plant Journal 1999. 18：491-497）。相关的生物物理参数建立在这里的数学建模，以了解定量的实验结果。提出了一个简单的一室模型，作为解释输入信号（即，温度T）以及该信息如何在植物细胞中转化为输出信号（即，[Ca2+]（c））。该模型基于以下事实：钙流入细胞质是由钙渗透通道介导的，钙渗透通道被认为仅依赖于冷却速率（dT/dt），钙流出是由钙泵介导的，钙泵已被证明依赖于绝对温度（T）。结果表明，该模型能够满足对实验数据进行满意解释的要求，并较好地再现了冷却诱导[Ca ~（2+）]（c）变化的实验观测特征。这表明，在植物中的主要温度传感器可能是一个Ca 2+渗透通道。
Recently the properties of temperature sensing in plants have been demonstrated experimentally by Plieth et al. (The Plant Journal 1999. 18:491-497). The relevant biophysical parameters are established here by mathematical modeling in order to understand the experimental findings in quantitative terms. A simple one compartment model is presented, as a preliminary approach to explain how the input signal (i.e., temperature T) is perceived and how the information is translated into an output signal in the plant cell (i.e., [Ca2+](c)). The model is based on the fact that calcium influx into the cytoplasm is mediated by calcium-permeable channels which are assumed to be solely dependent on cooling rate (dT/dt) and calcium efflux is mediated by calcium pumps which have been shown to be dependent on absolute temperature (T). Firstly, it is demonstrated that this model is able to meet the demand for a satisfactory interpretation of the experimental data, and secondly that it reproduces the experimentally observed features of the cooling induced [Ca2+](c) changes well. This suggests that the primary temperature sensor in plants might be a Ca2+-permeable channel.