Maintenance of constant leaf temperature by plants—I. Hypothesis-limited homeothermy
Maintenance of constant leaf temperature by plants—I. Hypothesis-limited homeothermy
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植物维持恒定的叶片温度——I.假设限制的恒温
DOI：
10.1016/0098-8472(88)90059-7
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发表时间：
1988
影响因子：
5.7
通讯作者：
D. R. Upchurch
中科院分区：
文献类型：
--
作者：
J. Mahan;D. R. Upchurch
植物温度与环境温度之间的关系是热胁迫研究中的一个重要问题。植物通常被认为是在温带环境中存在的变温动物，植物温度的一些变化被认为是正常的。我们实验室最近的研究表明，来自几种植物的酶的热依赖性比来自恒温动物的酶更具有特征。因此，虽然人们认为植物的热变化是正常的，但植物酶的热依赖性表明，这种变化可能是有压力的。我们提出了一个概念框架，用于植物主动维持规范或特征温度。我们认为植物的温度下限是由其环境控制的，而上限，即使在各种各样的条件下，也可以由植物控制并保持在一个规范的值。我们建议用“有限恒温”一词来描述植物的这种热行为。我们提出了工厂维持标准温度的三个约束条件；(1)有足够的能量流入使其温度升高到标准值；(2)有足够的蒸腾水供应；(3)有足够的湿度使其冷却到标准值。
The relationship between the temperature of a plant and the temperature of its environment is an important consideration in the study of thermal stress. Plants are generally assumed to be poikilotherms that exist in eurythermal environments and some variation in plant temperature is thought to be normal for the plant. Recent investigations in our laboratory have indicated that the thermal dependencies of enzymes from several plants are more characteristic of those from homeotherms than eurytherms. Thus, while it is assumed that thermal variation is normal for a plant, the thermal dependencies of the enzymes of the plant suggest that such variation may be stressful. We present a conceptual framework for the active maintenance of a normative, or characteristics, temperature by the plant. We propose that the lower limit of the temperature of a plant is controlled by its environment while the upper limit, even under a wide variety of conditions, can be controlled by the plant and maintained at a normative value. We suggest the term “limited homeothermy” to describe this type of thermal behavior by the plant. We propose three constraints on the maintenance of the normative temperature by the plant; (1) sufficient energy influx to raise its temperature to the normative value, (2) sufficient water supply for transpiration, and (3) humidity low enough to allow for cooling to the normative temperature.