A Proposed Method for Simultaneous Measurement of Cuticular Transpiration From Different Leaf Surfaces in Camellia sinensis
文献类型： 外文期刊
作者： Zhang, Yi 1 ; Chen, Xiaobing 4 ; Du, Zhenghua 4 ; Zhang, Wenjing 4 ; Devkota, Ananta Raj 4 ; Chen, Zijian 5 ; Chen, Ch 1 ;
作者机构： 1.Fujian Agr & Forestry Univ, Coll Hort, Fuzhou, Peoples R China
2.Fujian Agr & Forestry Univ, Fujian Prov Key Lab Haixia Appl Plant Syst Biol, Fuzhou, Peoples R China
3.Fujian Acad Agr Sci, Tea Res Inst, Fuzhou, Fujian, Peoples R China
4.Fujian Agr & Forestry Univ, FAFU UCR Joint Ctr Hort Biol & Metabol, Haixia Inst Sci & Technol, Fuzhou, Peoples R China
5.Univ Missouri, Coll Engn, Columbia, MO USA
6.Fujian Agr & Forestry Univ, Anxi Coll Tea Sci, Fuzhou, Peoples R China
7.Xinyang Normal Univ, Coll Life Sci, Henan Key Lab Tea Plant Biol, Xinyang, Peoples R China
关键词： cuticle; cuticular transpiration; epicuticular waxes; intracuticular waxes; adaxial; abaxial; gum arabic; vaseline
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）
ISSN： 1664-462X
年卷期： 2020 年 11 卷
页码：
收录情况： SCI
摘要： The plant cuticle is the major barrier that limits unrestricted water loss and hence plays a critical role in plant drought tolerance. Due to the presence of stomata on the leaf abaxial surface, it is technically challenging to measure abaxial cuticular transpiration. Most of the existing reports were only focused on leaf astomatous adaxial surface, and few data are available regarding abaxial cuticular transpiration. Developing a method that can measure cuticular transpiration from both leaf surfaces simultaneously will improve our understanding about leaf transpiration barrier organization. Here, we developed a new method that enabled the simultaneous measurement of cuticular transpiration rates from the adaxial and abaxial surfaces. The proposed method combined multi-step leaf pretreatments including water equilibration under dark and ABA treatment to close stomata, as well as gum arabic or vaseline application to remove or seal the epicuticular wax layer. Mathematical formulas were established and used to calculate the transpiration rates of individual leaf surfaces from observed experimental data. This method facilitates the simultaneous quantification of cuticular transpiration from adaxial and abaxial leaf surfaces. By applying this method, we demonstrated that the adaxial intracuticular waxes and the abaxial epicuticular waxes constitute the major transpiration barriers in Camellia sinensis. Wax analysis indicated that adaxial intracuticular waxes had higher coverage of very long chain fatty acids, 1-alkanol esters, and glycols, which may be attributed to its higher transpiration barrier than that of the abaxial intracuticular waxes.
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