论文部分内容阅读
The single and combinational effects of cadmium (Cd) and fluoranthene (FLT) on germination,growth and photosynthesis of soybean seedlings were investigated.Exposure to 5,10,or 15 mg Cd/L or 1,5,or 10 mg FLT/L individually or in combination significantly decreased germination vigor (3 days) and final germination rate of soybean seeds,except at 1 and 5 mg FLT/L.The results of two-way ANOVA analysis and the Bliss independence model showed that at lower concentrations of FLT (1 mg/L),the interaction between Cd and FLT on germination was antagonistic,whereas the interaction was synergistic when the concentration of FLT was 5 or 10 mg/L and the concentration of Cd was 15 mg/L.Growth,expressed as dry weight,length of shoot and root,leaf area,and photosynthesis,expressed as net photosynthetic rate,intercellular CO2 concentration,chlorophyll contents and tluorescence of soybean seedlings were also reduced by exposure to 5 or 10 mg Cd/L or 1 or 5 mg FLT/L,singly or jointly.Significant antagonistic effects of exposure to 5 or 10 mg Cd/L or 1 or 5 mg FLT/L on shoot growth and photosynthesis were observed,whereas synergy and antagonism of Cd and FLT were both observed for root growth.