| 肖佩云,陈雪雪,赵海明,莫测辉,向垒,李彦文,蔡全英.酞酸酯（PAEs）高、低积累水稻品种根系吸收PAEs的动力学差异[J].农业环境科学学报,2025,44(3):784-793. |
| 酞酸酯（PAEs）高、低积累水稻品种根系吸收PAEs的动力学差异 |
| Variation in uptake kinetic of phthalates（PAEs）by different roots of high and low PAE-accumulating rice cultivars |
| 投稿时间：2024-12-31 |
| DOI：10.11654/jaes.2024-1169 |
| 中文关键词: 水稻 邻苯二甲酸酯 吸收动力学 品种差异 新污染物 |
| 英文关键词: rice phthalates uptake kinetics cultivar variation emerging pollutants |
| 基金项目:国家自然科学基金面上项目（42377208，42077326） |
| 作者 | 单位 | E-mail | | 肖佩云 | 暨南大学管理学院, 广州 510632 | | | 陈雪雪 | 岭南师范学院生命科学与技术学院, 广东 湛江 524048 | | | 赵海明 | 暨南大学生命科学技术学院, 广东省污染控制与修复工程技术中心, 广州 510632 | | | 莫测辉 | 暨南大学生命科学技术学院, 广东省污染控制与修复工程技术中心, 广州 510632 | | | 向垒 | 暨南大学生命科学技术学院, 广东省污染控制与修复工程技术中心, 广州 510632 | | | 李彦文 | 暨南大学生命科学技术学院, 广东省污染控制与修复工程技术中心, 广州 510632 | | | 蔡全英 | 暨南大学生命科学技术学院, 广东省污染控制与修复工程技术中心, 广州 510632 | yingqy@126.com |
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| 中文摘要: |
| 为探究不同品种水稻根系吸收酞酸酯（PAEs）的动力学差异，利用3种PAEs化合物、设置不同浓度进行水稻水培试验，研究不同品种水稻对PAEs的吸收积累差异。结果表明：PAEs高、低积累水稻品种根系对PAEs的吸收量随时间延长而增加，吸收过程可分为快速吸收（0~2 h）和慢速吸收（4~36 h）两个阶段，二者以主动吸收为主；高 PAEs积累品种培杂泰丰的根系对 PAEs的吸收能力比低 PAEs 积累品种丰优丝苗的强。水稻根系的 PAEs 吸收速率受其营养液浓度影响，二者之间的关系能用 MichaelisMenten方程拟合；培杂泰丰的米氏常数（Km）较丰优丝苗的小，而对PAEs吸收载体的亲和力以培杂泰丰的更高，这可能是2种水稻吸收积累PAEs差异的原因之一。3种PAEs化合物相比，水稻根系对其亲和力大小为邻苯二甲酸二（2-乙基己基）酯（DEHP）>邻苯二甲酸正二丁酯>邻苯二甲酸二乙酯，导致水稻积累更多的 DEHP。水稻根系吸收 PAEs会导致其营养液 pH升高，增幅（ΔpH）为培杂泰丰>丰优丝苗，即培杂泰丰对PAEs吸收转运载体的亲和力较丰优丝苗强。研究表明，丰优丝苗具有更低的PAEs亲和力和吸收速率，因此其比培杂泰丰可吸收积累更少的PAEs，更有利于农产品安全。 |
| 英文摘要: |
| To investigate the variation in uptake kinetic of phthalates（PAEs）by the roots of high and low PAE-accumulating rice cultivars, hydroponic experiments were conducted using three different PAE compounds at various concentrations to explore their PAE accumulation variations. The results indicated that the uptake of PAEs by the roots of high and low PAE-accumulating rice cultivars increased over time. This uptake processes could be divided into two stages：rapid（0-2 h）and slow absorption（4-36 h）. The high PAE-accumulating cultivar （i.e., Peizataifeng）showed a stronger PAE absorption capacity compared to the low one（i.e., Fengyousimiao）. The uptake rate of PAEs by rice roots depended on PAE concentrations in nutrient solution, and their relationship could be fitted by the MichaeliS-Menten equation. The Michaelis constant（Km）for cultivar Peizataifeng was smaller than that for Fengyousimiao, while the affinity of the absorption carrier for PAEs was higher in Peizataifeng. This might be one of the reasons for the variation in PAE uptake and accumulation between the two cultivars. Among three PAE compounds, the affinity of rice roots decreased in the order：di（2-ethylhexyl）phthalate（DEHP）> dibutyl phthalate > diethyl phthalate, leading to a higher accumulation of long side-chain DEHP in rice. The absorption of PAEs by rice roots led to pH increase in nutrient solution, with the increase（ΔpH）being greater for the solution of Peizataifeng than for Fengyousimiao. This was consistent with the order of affinity for PAE absorption and transport carriers. The study demonstrated that Fengyousimiao had a lower affinity and absorption rate for PAEs, resulting in less PAE accumulation than Peizataifeng, which benefited for safety of agricultural products. These results provided scientific basis for safety of agricultural products. |
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