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首页> 美国卫生研究院文献>Plant Physiology >Study of Root Uptake and Xylem Translocation of Cinmethylin and Related Compounds in Detopped Soybean Roots Using a Pressure Chamber Technique
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Study of Root Uptake and Xylem Translocation of Cinmethylin and Related Compounds in Detopped Soybean Roots Using a Pressure Chamber Technique

机译：利用压力室技术研究大豆顶梢中五倍子素及其相关化合物的根吸收和木质部移位

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A pressure chamber technique was used to study the root uptake and xylem translocation of nonradiolabeled cinmethylin and its analogs in detopped soybean (Glycine max) roots. Quantifications of compounds were achieved by gas chromatography analysis using a mass spectrometry detector under selected ion monitoring. The compounds tested, with octanol-water partition coefficients (log Kow values) ranging from 0.96 to 5.3, were all nonionizable under the experimental conditions. Root efflux curves of all compounds exhibited a steady-state kinetic profile. The time required to achieve the steady state efflux concentration in the xylem sap correlated with log Kow values in a manner very similar to the root binding profile reported previously by GG Briggs et al. ([1982] Pestic Sci 13: 495-504). After reaching the steady state efflux, the concentration ratio of each compound in the xylem sap to the final concentration in the pressure chamber was taken as the transpiration stream concentration factor (TSCF). A nonlinear relationship was observed between TSCF and log Kow values. The highest TSCF value was between 0.6 to 0.8 for compounds with log Kow between 2.5 to 3.5. The range of optimal log Kow values was slightly higher than that reported earlier by Briggs et al. ([1982] Pestic Sci 13: 495-504). After taking into account the binding of the compound to soil, the apparent optimal Kow value for best root-to-shoot translocation is lowered to around 1. The relationship of root-to-shoot and phloem translocation was also discussed to promote a better understanding at the whole plant level of the uptake and translocation of a soil-applied xenobiotic.
机译：使用压力室技术研究了去放射性大豆（Glycine max）根中非放射性标记的cinmethylin及其类似物的根吸收和木质部转运。在选定的离子监控下，通过使用质谱检测器的气相色谱分析实现化合物的定量。辛醇-水分配系数（log Kow值）为0.96至5.3的受试化合物在实验条件下均不可离子化。所有化合物的根流出曲线均显示稳态动力学曲线。在木质部汁液中达到稳态外排浓度所需的时间与log Kow值相关，其方式与GG Briggs等人先前报道的根结合特征非常相似。 （[1982] Pestic Sc​​i 13：495-504）。达到稳态流出后，将木质部汁液中每种化合物与压力室中最终浓度的浓度比作为蒸腾流浓度因子（TSCF）。在TSCF和log Kow值之间观察到非线性关系。对于log Kow在2.5至3.5之间的化合物，最高TSCF值在0.6至0.8之间。最佳log Kow值范围比Briggs等人先前报道的范围稍高。 （[1982] Pestic Sc​​i 13：495-504）。考虑到化合物与土壤的结合后，最佳的根茎易位的表观最佳Kow值降低到1左右。还讨论了根茎与韧皮部易位的关系，以促进更好的理解在整个植物水平上，土壤应用异种生物的吸收和转运。

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