呋虫胺在水培草莓植株中的吸收及转运特征
Uptake and Transport of Dinotefuran in Hydroponic Strawberry Plants
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摘要: 农药残留已经引起了人们对作物污染的日益关注。本研究将草莓在含有20 mg·L-1呋虫胺(dinotefuran, DIN)的水培液中持续暴露240 h，探究了呋虫胺在草莓植物中的吸收转运规律。研究结果表明，无苗有药对照溶液中呋虫胺的残留量10 d后降低了5.14%，处理组溶液中残留量降幅达19.2%；草莓植株可以从水培液中吸收呋虫胺并向茎叶转运，试验处理168 h后达到吸收稳定状态，呋虫胺在叶部富集程度约为根部的2.1倍；草莓植株各器官从水培液中富集呋虫胺的能力大小为叶>根>茎；草莓中呋虫胺从根到茎的转运因子(TF)约为0.28～0.51，从茎到叶的TF约为1.18～4.74；表明草莓中呋虫胺更易从茎转运到叶；随着暴露时间的增加，单株草莓根部呋虫胺占比不断减少，叶部占比不断增加。上述结果表明，呋虫胺被草莓根部吸收后，易向上运输富集在草莓叶片中。Abstract: Pesticide residues have raised increasing concerns about crop contamination, while information about the uptake and transfer characteristics of pesticides in strawberries is currently insufficient. In this study, the uptake and transport of dinotefuran in strawberry plants (Fragaria×ananassa Duch.) were explored under hydroponic conditions. The results obtained here reveal that the dinotefuran residues in the control solution without seedlings decreased by 5.14% after 10 d, while those in the treatment group decreased by 19.2%. Strawberry roots could absorb dinotefuran from hydroponic solution and transport it to stems and leaves. The accumulation of dinotefuran in leaves was about 2.1 times as much as that in roots when the uptake quasi-equilibrium was reached. The order of the enrichment ability of dinotefuran in each part of the strawberry was leaf, root, and stem in turn. The translocation factor (TF) of dinotefuran from strawberry root to stem was about 0.28~0.51, and that from stem to leaf was about 1.18~4.74, suggesting its strong preference to concentrate in plant leaves. Hopefully, the results of this study will provide important data support for the scientific, rational, and safe use of dinotefuran in strawberries.
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Key words:
- dinotefuran /
- strawberry /
- uptake /
- transport /
- accumulation
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