Cr~(6+)对皱叶留兰香生长及生理生化的影响

目的]为皱叶留兰香野生蔬菜生产中预报金属铬的污染及消除其毒害提供理论依据。方法]通过水培试验,研究不同浓度的重金属Cr6(+0、5、10、50和100mg/L)对野生蔬菜皱叶留兰香生长、生理生化特性的影响。结果]当Cr6+浓度>5mg/L时,皱叶留兰香株高、叶面积、产量及叶绿素a/b比值随着Cr6+浓度的升高而明显下降。植株体内细胞膜透性和MDA含量随着Cr6+处理浓度的增加而逐渐增大,SOD活性随Cr6+浓度增到50mg/L时上升,达到峰值后下降;POD活性随Cr6+浓度的增加而下降。SOD对铬引起氧化胁迫具有相应的适应和抵抗能力,在皱叶留兰香生长抗铬胁迫防止膜脂过氧化起着重要作用。结论]野生蔬菜皱叶留兰香对浓度为10mg/L的Cr6+污染胁迫有较强的适应性和防御能力。

Effects of Cr6 on the Growth and Physiological and Biochemical Characteristics of Mentha crispata Schrad.

Objective] The research aimed to provide the theoretical basis for predicting the pollution of metal Cr and eliminating its damage in the production of wild vegetable Mentha crispata Schrad.Method] In water culture experiment,the effects of heavy metal Cr6 at different concn.(0,5,10,50 and 100 mg/L) on the growth and physiological and biochemical characteristics of wild vegetable M.crispate were studied.Result] when Cr6 was more than 5 mg/L,the plant height,leaf area,yield and the ratio of chlorophyll a/b obviously were decreased with the increase of Cr6 concn.Cell membrane permeability and MDA content in plant gradually were increased with the increment of Cr6 concn.SOD activity was enhanced when Cr6 concn.was increased up to 50 mg/L and decreased after Cr6 concn.reached the peak.POD activity was decreased with the increase of Cr6 concn.SOD had the corresponding adaptability and resistance to the oxidative stress caused by Cr and it played an important role in preventing the membrane lipid peroxidation and resisting Cr stress in the growth of M.crispate.Conclusion] Wild vegetable M.crispate had stronger adaptability and the defense ability to Cr6 stress at 10 mg/L.