Plant response to drought stress simulated by ABA application: Changes in chemical composition of cuticular waxes |
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| Affiliation: | 1. Department of Plant Physiology, Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice CZ-37005, Czech Republic;2. Department of Botany, Faculty of Science, University of South Bohemia, Na Zlaté stoce 1, České Budějovice CZ-37005, Czech Republic;3. Institute of Plant Molecular Biology, Biology Centre ASCR, Branišovská 31, České Budějovice CZ-37005, Czech Republic;4. Section of Plant Ecology, Institute of Botany ASCR, Dukelská 135, Třeboň CZ-37901, Czech Republic;5. Institute of Cell and Molecular Botany, University of Bonn, Kirschallee 1, Bonn D-53115, Germany;1. Korea Research Institute of Bioscience and Biotechnology, 125 Gwahangno, Yuseong-gu, Daejeon 305-806, Republic of Korea;2. Koregon Company, 60-34, Gokcheon-Gil, Bogae-Myeon, Anseong-Si, Gyeonggi-Do 456-871, Republic of Korea;3. Department of Bio-Environmental Chemistry, College of Agriculture & Life Sciences, Chungnam National University, Daejeon 305-764, Republic of Korea;4. Department of Crop Science, College of Agriculture & Life Sciences, Chungnam National University, Daejeon 305-764, Republic of Korea;5. Department of Food Science and Nutrition, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do 200-702, Republic of Korea;1. Department of Chemistry, The University of British Columbia, Vancouver, BC, V6T 1Z1, Canada;2. Department of Botany, The University of British Columbia, Vancouver, BC, V6T 1Z4, Canada;1. State Key Laboratory of Agrobiotechnology, College of Biological Sciences, Agricultural University, Beijing 100193, China;2. China Tobacco Jiangsu Industry CO., Ltd, Jiangsu 210011, China;3. Joint International Research Laboratory of Metabolic & Developmental Sciences, Shanghai Jiao Tong University-University of Adelaide Joint Centre for Agriculture and Health, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;4. State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China;5. Chengdu Shishi High School, Sichuan 610052, China |
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| Abstract: | Plant cuticles form the interface between epidermal plant cells and the atmosphere. The cuticle creates an effective barrier against water loss, bacterial and fungal infection and also protects plant tissue from UV radiation. It is composed of the cutin matrix and embedded soluble lipids also called waxes. Chemical composition of cuticular waxes and physiological properties of cuticles are affected by internal regulatory mechanisms and environmental conditions (e.g. drought, light, and humidity). Here, we tested the effect of drought stress simulation by the exogenous application of abscisic acid (ABA) on cuticular wax amount and composition. ABA-treated plants and control plants differed in total aboveground biomass, leaf area, stomatal density and aperture, and carbon isotope composition. They did not differ in total wax amount per area but there were peculiar differences in the abundance of particular components. ABA-treated plants contained significantly higher proportions of aliphatic components characterized by chain length larger than C26, compared to control plants. This trend was consistent both between and within different functional groups of wax components. This can lead to a higher hydrophobicity of the cuticular transpiration barrier and thus decrease cuticular water loss in ABA-treated plants. At both ABA-treated and control plants alcohols with chain length C24 and C26 were predominant. Such a shift towards wax compounds having a higher average chain length under drought conditions can be interpreted as an adaptive response of plants towards drought stress. |
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