Tredenick E C, Stuart-Williams H, Enge T G
Division of Plant Sciences, ARC Centre of Excellence in Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia.
Department of Engineering Science, University of Oxford, Oxford, United Kingdom.
Front Plant Sci. 2022 Jul 12;13:722710. doi: 10.3389/fpls.2022.722710. eCollection 2022.
Materials on plant leaf surfaces that attract water impact penetration of foliar-applied agrochemicals, foliar water uptake, gas exchange, and stomatal density. Few studies are available on the nature of these substances, and we quantify the hygroscopicity of these materials. Water vapor sorption experiments on twelve leaf washes of sample leaves were conducted and analyzed with inductively coupled plasma-optical emission spectroscopy (ICP-OES) and X-ray diffraction. All leaf surface materials studied were hygroscopic. Oils were found on the surface of the studied. For mangroves that excrete salt to the leaf surfaces, significant sorption occurred at high humidity of a total of 316 mg (~0.3 ml) over 6-10 leaves and fitted a Guggenheim, Anderson, and de Böer sorption isotherm. Materials on the plant leaf surface can deliquesce and form an aqueous solution in a variety of environments where plants grow, including glasshouses and by the ocean, which is an important factor when considering plant-atmosphere relations.
植物叶片表面吸引水分的物质会影响叶面喷施农用化学品的渗透、叶面水分吸收、气体交换和气孔密度。关于这些物质的性质，目前研究较少，我们对这些物质的吸湿性进行了量化。对12份样本叶片的叶洗物进行了水蒸气吸附实验，并用电感耦合等离子体发射光谱法（ICP-OES）和X射线衍射进行了分析。所有研究的叶片表面物质都具有吸湿性。在所研究的叶片表面发现了油脂。对于向叶片表面排泄盐分的红树林，在高湿度条件下，6至10片叶子上总共发生了316毫克（约0.3毫升）的显著吸附，符合古根海姆、安德森和德布尔吸附等温线。植物叶片表面的物质在包括温室和海边在内的植物生长的各种环境中会潮解并形成水溶液，这在考虑植物与大气的关系时是一个重要因素。
