| 王晋峰,包环宇,蔡军,李嘉,吴福勇.冬小麦叶角质层组分对菲和芘的吸附及影响[J].农业环境科学学报,2022,41(4):716-725. |
| 冬小麦叶角质层组分对菲和芘的吸附及影响 |
| Effects of leaf cuticle components on phenanthrene and pyrene adsorption in winter wheat |
| 投稿时间：2021-08-29 |
| DOI：10.11654/jaes.2021-0983 |
| 中文关键词: 冬小麦 多环芳烃 叶面吸收 角质层组分 吸附 |
| 英文关键词: winter wheat PAHs foliar uptake cuticle composition adsorption |
| 基金项目:国家自然科学基金项目（42077325，41571456） |
| 作者 | 单位 | E-mail | | 王晋峰 | 山西农业大学生态环境产业技术研究院/土壤环境与养分资源山西省重点实验室, 太原 030031
西北农林科技大学资源环境学院, 陕西 杨凌 712100
农业农村部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 包环宇 | 西北农林科技大学资源环境学院, 陕西 杨凌 712100
农业农村部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 蔡军 | 西北农林科技大学资源环境学院, 陕西 杨凌 712100
农业农村部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 李嘉 | 西北农林科技大学资源环境学院, 陕西 杨凌 712100
农业农村部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 吴福勇 | 西北农林科技大学资源环境学院, 陕西 杨凌 712100
农业农村部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | wfy09@163.com |
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| 中文摘要: |
| 冬小麦叶面吸收多环芳烃（Polycyclic aromatic hydrocarbons，PAHs）途径内在机制及影响因素尚不清晰。本研究采用化学分离法将冬小麦叶角质层分为7个不同组分，通过比较不同角质层组分对菲和芘吸附的影响，揭示角质层分离组分的组成和结构对菲（Phenanthrene，PHE）和芘（Pyrene，PYR）吸收的作用机制。结果表明：冬小麦叶角质层中除可提取脂质蜡质外，还含有丰富的聚合脂质角质，其含量是蜡质的1.3倍。角质层中被糖类包裹的角碳并非连续分布，而角质则连续分布。角质层各组分元素组成存在较大差异，其非极性组分主要是角质，极性组分主要是糖类。冬小麦角质层4种组分对PHE的相对吸附系数大小顺序为：角碳>角质>角碳-糖类复合体>蜡质，对PYR的相对吸附系数大小顺序为：角质>角碳>角碳-糖类复合体>蜡质。这可能是由于角碳中芳香碳较为丰富，更易与PHE和PYR发生特殊的π-π吸附作用，而角质中含有较高水平的无定形石蜡，为PHE与角质中的柔性长烷基链基团之间的疏水作用提供了分配介质，由于蜡质含量较低，表现出较低的吸附系数。此外，角质层组分吸附系数与碳含量呈正线性相关，而与氧含量、极性指数呈显著负线性相关。研究表明，角碳和角质是PAHs的主要存储介质，由于角质层蜡质含量较低（9.6%），蜡质组分对PAHs的吸附贡献最低。角质层组分碳含量越高，其对PAHs的吸附能力越强，而角质层组分氧含量和极性指数越高，其对PAHs的吸附能力越弱。 |
| 英文摘要: |
| 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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