Transport via xylem of atrazine, 2,4-dinitrotoluene, and 1,2,3-trichlorobenzene in tomato and wheat seedlings

文献类型： 外文期刊

第一作者： Su, Yu H.

作者： Su, Yu H.;Liang, Yong C.;Liang, Yong C.

作者机构：

关键词： atrazine: 1912-24-9;pesticide;soil pollutant;pollutant;2;4-dinitrotoluene: pesticide;soil pollutant;pollutant;1;2;3-trichlorobenzene: pesticide;soil pollutant;pollutant;exposure time;time-dependent transport;translocation stream concentration factor;fast foliar uptake;concentration-dependent transport

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：3.963； 五年影响因子：4.454 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Transport of atrazine (ATR), 2,4-dinitrotoluene (DNT), and 1,2,3-trichlorobenzene (TCB) from roots to shoots via xylem of wheat and tomato seedlings was measured following a 24-h exposure of plant roots to hydroponic solutions of these organic compounds. Transport of the compounds from roots to shoots reached equilibrium within 24 h, consistent with an earlier finding. Low concentrations of TCB were detected in the final external solution and the xylem efflux of control wheat seedlings. This suggested that there was a fast foliar uptake of TCB and its downward movement via phloem of the wheat seedlings. Concentrations of DNT, AIR, and TCB in xylem effluxes of wheat and tomato increased significantly with increases of their external concentrations. The translocation stream concentration factors (TSCF), i.e., the ratios of the concentrations in xylem sap to those in external solution, of the compounds with tomato seedlings followed the order of AIR > DNT >> TCB, which was inversely correlated with the log K-ow (the octanol-water partition coefficient) of the compounds. The observed xylem transports of DNT and TCB from roots to shoots with wheat seedlings were lower than those with tomato seedlings. ATR exhibited a high xylem transport with the two plant species, which resulted presumably from an atrazinemetal complex formation

分类号： S4

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