BS 12与Cd2+复合污染对空心菜种子萌发及生长的影响

研究两性表面活性剂BS-12和Cd2+共存对空心菜种子萌发、叶绿素含量及MDA含量等的影响。结果表明,在Cd2+单独作用下,Cd2+质量浓度为5 mg/L时,能促进空心菜种子萌发,Cd2+质量浓度≥10 mg/L时,对其萌发产生毒害作用。BS-12与Cd2+共存时,在同一Cd2+质量浓度条件下,当加入较低质量浓度的BS-12时,能降低Cd2+对空心菜的毒害作用。具体表现为空心菜的发芽率、株高和叶绿素含量都随着BS-12质量浓度的升高呈现先上升后下降的趋势,而MDA含量呈现先下降后上升的趋势。因此,通过以上生理生化指标的测定,可以得知BS-12≤50 mg/L时,能降低Cd2+对空心菜种子萌发的毒害作用。

Effects of BS 12 and Cd2+ Interaction on Water Spinach Germination and Growth

The effects of the co-existing of dodecyl-dimethyl-betaine BS-12 and cadmium ion(Cd2+) on the germination of water spinach were studied.The results showed that the lower concentrations 5 mg/L of Cd2+ could promote germination of water spinach,while Cd2+ was toxic to water spinach at higher concentrations ≥10 mg/L.In the same Cd2+ concentration,the lower concentrations of BS-12 can mitigate the toxicity of Cd2+ to water spinach.Germination rate,the plant height,chlorophyll content increased first,then decreased with increasing BS-12 concentrations;while the content of malondialdehyde(MDA) decreased first and then raised with increasing BS-12 concentrations.So according to the determination of these indexes,concentrations of BS-12 ≤50 mg/L can mitigate the toxicity of Cd2+ to the germination of water spinach.