PENETRATION OF STOMATA BY LIQUIDS - DEPENDENCE ON SURFACE-TENSION, WETTABILITY, AND STOMATAL MORPHOLOGY
PENETRATION OF STOMATA BY LIQUIDS - DEPENDENCE ON SURFACE-TENSION, WETTABILITY, AND STOMATAL MORPHOLOGY
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DOI：
10.1104/pp.49.5.813
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发表时间：
1972-01-01
期刊：
影响因子：
7.4
通讯作者：
BUKOVAC, MJ
中科院分区：
文献类型：
--
作者：
SCHONHERR, J;BUKOVAC, MJ
叶片表面的润湿性、液体的表面张力和气孔形态控制液体对气孔的渗透。本文研究了紫穗草（Zebrina purpusiiBru.）估计为25到30达因cm-1。具有小于30达因cm-1的表面张力的液体在叶表面上产生零接触角并且自发地渗透气孔，而具有大于30达因cm-1的表面张力的液体不润湿叶表面并且不能渗透气孔。考虑到气孔作为锥形毛细管，我们能够表明，与液体提供一个有限的接触角，渗透仅取决于接触角的大小和孔壁角之间的关系。通常，当接触角小于孔壁的壁角时，气孔会自发渗透。气孔开度（4、6、8、10 μm）对气孔的影响不大。角质壁架存在于入口处的外部前庭和内部前庭和气孔下室之间导致非常小的，如果不是零壁角，从而发挥了主要作用，排除水从叶的细胞间隙。我们表明为什么气孔开放的程度不能通过观察低表面张力的有机液体的气孔自发渗透进行评估。
Wettability of the leaf surface, surface tension of the liquid, and stomatal morphology control penetration of stomata by liquids. The critical surface tension of the lower leaf surface ofZebrina purpusiiBrückn. was estimated to be 25 to 30 dyne cm−1. Liquids having a surface tension less than 30 dyne cm−1gave zero contact angle on the leaf surface and infiltrated stomata spontaneously while liquids having a surface tension greater than 30 dyne cm−1did not wet the leaf surface and failed to infiltrate stomata. Considering stomata as conical capillaries, we were able to show that with liquids giving a finite contact angle, infiltration depended solely on the relationship between the magnitude of the contact angle and the wall angle of the aperture. Generally, spontaneous infiltration of stomata will take place when the contact angle is smaller than the wall angle of the aperture wall. The degree of stomatal opening (4, 6, 8, or 10 μm) was of little importance. Cuticular ledges present at the entrance to the outer vestibule and between the inner vestibule and substomatal chamber resulted in very small if not zero wall angles, and thus played a major role in excluding water from the intercellular space of leaves. We show why the degree of stomatal opening cannot be assessed by observing spontaneous infiltration of stomata by organic liquids of low surface tension.