渗透梯度对液泡苹果酸储存的影响：景天酸代谢振荡行为的一个基本原理。
Effects of osmotic gradients on vacuolar malic Acid storage: a basic principle in oscillatory behavior of crassulacean Acid metabolism.
作者信息
Lüttge U, Kluge M, Ball E
机构信息
Botanisches Institut, Fachbereich Biologie, Technische Hochschule Darmstadt, D-6100 Darmstadt, Germany.
出版信息
Plant Physiol. 1975 Nov;56(5):613-6. doi: 10.1104/pp.56.5.613.
Abstract
Malate synthesis by CO(2) dark fixation and malate accumulation in the vacuoles of leaf slices of Kalanchoë daigremontiana Hamet et Perrier, a plant performing crassulacean acid metabolism, occurs only in external solutions where the osmotic pressure difference between the cells and the medium is low. Conversely, malate loss from the vacuoles depends on a high osmotic pressure difference between the cells and the medium and is observed in media of low osmotic pressure. This suggests that the diurnal oscillations of malate levels in crassulacean acid metabolism leaf cells are regulated by osmotic gradients. These findings support a model which is introduced to explain how the rhythm of crassulacean acid metabolism may function in the intact plant.
摘要
在进行景天酸代谢的植物——落地生根（Kalanchoë daigremontiana Hamet et Perrier）的叶片切片中，通过二氧化碳暗固定合成苹果酸以及苹果酸在液泡中的积累，仅发生在细胞与培养基之间渗透压差较低的外部溶液中。相反，液泡中苹果酸的损失取决于细胞与培养基之间较高的渗透压差，并且在低渗透压的培养基中可以观察到。这表明景天酸代谢叶片细胞中苹果酸水平的昼夜振荡受渗透梯度调节。这些发现支持了一个被引入的模型，该模型用于解释景天酸代谢的节律在完整植物中可能如何发挥作用。
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