期刊
PHYTOCHEMISTRY
卷 190, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2021.112894
关键词
Campo rupestre; Cuticular waxes; Foliar water uptake; Ultrastructural traits; Epicuticular wax crystals
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Apoio ao Pessoal do Ensino Superior (CAPES)
- PPGBV of the Universidade Federal de Minas Gerais
- CNPq [304535/2019-2]
The study found that the chemical composition of plant cuticular waxes is related to the speed of water absorption in leaves, but not to the maximum water absorbed. Additionally, the presence of wax crystals in the cuticle may interfere with foliar water uptake.
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.
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