Effect of temperature on cuticular transpiration of isolated cuticular membranes and leaf discs
Effect of temperature on cuticular transpiration of isolated cuticular membranes and leaf discs
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DOI：
10.1093/jexbot/52.362.1893
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发表时间：
2001-09-01
影响因子：
6.9
通讯作者：
Schreiber, L
中科院分区：
文献类型：
--
作者：
Schreiber, L
在10 ℃至55 ℃之间的温度范围内，使用氚化水和五种植物（大叶草，月桂酸樱桃，连翘，酸橙、和常春藤（Hedera helix L.）。角质层水渗透率与孤立的角质层膜测量与叶盘角质层水渗透率没有不同。根据物种的不同，角质层透水性增加的倍数在12（V. major）到264（H.）之间。螺旋）。Arrhenius图（InP与1/T）的所有研究物种的特征在于相变发生在30-39 degreesC的温度范围内。从Arrhenius图计算了相变中点以下和以上植物细胞的水渗透活化能。根据物种的不同，它们在26（F。intermedia）至61 kJ mol（-1）（H.螺旋）低于相变和从67（V. major）到122 kJ mol（-1）（F.中间体）上的相变。由于相变的发生总是导致角质层蒸腾速率显着增加，有人认为，温度高于35 degreesC造成的结构缺陷的运输限制障碍的所有物种的植物角质层的调查。
Cuticular transpiration was measured in the temperature range between 10 degreesC and 55 degreesC using tritiated water and five species (Vinca major L., Prunus laurocerasus L., Forsythia intermedia L., Citrus aurantium L., and Hedera helix L.). Cuticular water permeabilities measured with isolated cuticular membranes were not different from cuticular water permeabilities measured with leaf discs. Depending on the species cuticular water permeabilities increased by factors between 12 (V. major) to 264 (H. helix) when temperature was increased from 10 degreesC to 55 degreesC. Arrhenius plots (InP versus 1/T) of all investigated species were characterized by phase transitions occurring in the temperature range of 30-39 degreesC. Activation energies for water permeability across plant cuticles below and above the midpoint of phase transition were calculated from Arrhenius plots. Depending on the species they varied between 26 (F. intermedia) to 61 kJ mol(-1) (H. helix) below the phase transition and from 67 (V. major) to 122 kJ mol(-1) (F. intermedia) above the phase transition. Since the occurrence of phase transitions always lead to significantly increased rates of cuticular transpiration it is argued that temperatures higher than 35 degreesC caused structural defects to the transport-limiting barrier of the plant cuticles of all species investigated.