Cuticular wax composition contributes to different strategies of foliar water uptake in six plant species from foggy rupestrian grassland in tropical mountains.

Autor: Boanares D; Departamento de Botânica, Universidade Federal de Minas Gerais, Minas Gerais, Brazil. Electronic address: danielaboanares@gmail.com., Bueno A; University of Würzburg, Julius-von-Sachs Institute of Biological Sciences, Chair of Botany II - Ecophysiology and Vegetation Ecology, Würzburg, Germany. Electronic address: amauri.bueno@uni-wuerzburg.de., de Souza AX; University of Würzburg, Julius-von-Sachs Institute of Biological Sciences, Chair of Botany II - Ecophysiology and Vegetation Ecology, Würzburg, Germany., Kozovits AR; Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto, Minas Gerais, Brazil., Sousa HC; Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto, Minas Gerais, Brazil., Pimenta LPS; Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Minas Gerais, Brazil., Isaias RMDS; Departamento de Botânica, Universidade Federal de Minas Gerais, Minas Gerais, Brazil., França MGC; Departamento de Botânica, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
Jazyk: angličtina
Zdroj: Phytochemistry [Phytochemistry] 2021 Oct; Vol. 190, pp. 112894. Date of Electronic Publication: 2021 Aug 05.
DOI: 10.1016/j.phytochem.2021.112894
Abstrakt: The cuticle is the outermost region of the epidermal cell wall of plant aerial organs. The cuticle acts as a two-way lipid barrier for water diffusion; therefore, it plays a vital role in foliar water uptake (FWU). We hypothesised that the chemical composition of the cuticular waxes influences the FWU strategy that plants adopt in a foggy tropical ecosystem. We analysed the leaf cuticular waxes of six plant species known by their different FWU strategies, in both qualitative and quantitative approaches, to test this hypothesis. We also investigated the fine structure of the plant cuticle by scanning electron microscopy. Neither the total wax loads nor the amounts of single wax compound classes correlated to the FWU. In contrast, the qualitative chemical composition of the cuticular waxes was related to the water absorption speed but not to the maximum water absorbed. The presence of wax crystals might interfere with the FWU. Our findings suggest that a complex three-dimensional network of the cuticular compounds contributes to different strategies of FWU in six plant species from foggy tropical mountaintops.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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