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| Effects of leaf cuticle components on phenanthrene and pyrene adsorption in winter wheat |
| Received:August 29, 2021 |
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| KeyWord:winter wheat;PAHs;foliar uptake;cuticle composition;adsorption |
| Author Name | Affiliation | E-mail | | WANG Jinfeng | Engineer and Technology Academy of Ecology and Environment, Shanxi Agricultural University/Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources, Taiyuan 030031, China
College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | BAO Huanyu | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | CAI Jun | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | LI Jia | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | WU Fuyong | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | wfy09@163.com |
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| Abstract: |
| This study investigates the mechanism of polycyclic aromatic hydrocarbons（PAHs）uptake, via the foliar uptake pathway, in winter wheat – as well as the factors influencing this uptake. To do this, the cuticles of winter wheat leaves were divided into seven components using a chemical separation method. Comparing the effects of different cuticle components on the adsorption of phenanthrene （PHE）and pyrene（PYR）revealed the mechanism underpinning the composition and structure of the components and their absorption of PHE and PYR. The results showed that the polymeric lipid cutin was present in the cuticles of winter wheat leaves at a value 1.3 times that of lipid wax. The distribution of cutan in cuticle coated with sugar was not continuous, while the distribution of cutin was continuous. The elemental composition of each component of the cuticle differed considerably; cutin was the main non-polar component while sugar was the main polar component. The relative PHE adsorption coefficients of the four components in the cuticle of winter wheat were, in descending order, cutan > cutin > cutan-carbohydrate complex > wax; the relative PYR adsorption coefficient for the same, in descending order, was cutin > cutan > cutan-carbohydrate complex > wax. These results might be due to the abundance of aromatic carbons in angular carbon, which is more prone to a unique π-π adsorption with PHE and PYR. Keratin had a high level of amorphous paraffin, providing a medium for distributed hydrophobic interactions between PHE and flexible long alkyl chain groups in keratin. Due to the low wax content, the low adsorption coefficient was low; the lower wax content（9.6%）in the cuticle meant that wax contributed the least to the sorption of PAHs. The sorption coefficient of cuticular components exhibited a positive linear relationship with carbon content but a significant negative linear relationship with the oxygen content and polarity index. These results indicate that an increasing carbon content elevates the adsorption capacity of the cuticular components for PAHs. |
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