小麦根系吸收菲的动力学机制探究

Kinetic characteristics of phenanthrene uptake by wheat roots under hydroponic condition

以菲为多环芳烃(PAHs)的代表物,在水培条件下对小麦根系菲吸收的动力学机制进行了初步地探讨。结果表明:小麦根系对水培液中的菲有明显的吸收和累积作用。在48 h内,当水培液中菲质量浓度为1.00 mg.L-1时,小麦根系对菲的吸收量随时间呈指数增加。在水培液中菲质量浓度在0～1.00 mg.L-1范围内,小麦根系对菲的吸收可用米氏方程表征,这意味着小麦根系对菲的吸收受代谢影响,吸收过程中存在主动吸收机制。

Hydroponic experiment was performed in this study to explore the dynamics of phenanthrene （PHE） uptake by wheat roots. The results showed that wheat roots were able to take up and accumulate PHE in culture solution. For the treatment of 1.00 mg·L^-1 of the initial PHE concentration in culture solution, PHE uptake by wheat roots could be described with an exponential model within 48 hours of exposure. When PHE concentration in solution ranged from 0 to 1.00 mg·L^-1 , uptake of PHE by the roots of the wheat fitted Miehaelis-Menten equation well, implying that there was a presence of active uptake of PHE by wheat roots.