Hg^(2+)对扬花萝卜幼苗生长影响情况的研究

A Study on the Effect of Hg^(2+) Pollution on Seedling Growth of Yanghua Radish

采用沙培法研究了扬花萝卜幼苗受到Hg2+胁迫时,其根冠比、鲜重、干重、叶绿素a与b和MDA含量,以及SOD酶的活性等指标变化情况.结果表明,在低浓度1 mg.L-1～5 mg.L-1Hg2+胁迫下,植株的根冠比大于对照,叶绿素含量略有增加;而高浓度20 mg.L-1～100 mg.L-1的Hg2+胁迫下,植株的根冠比小于对照组(P≤0.05),叶绿素含量呈下降趋势.实验进一步表明,在1 mg.L-1～5 mg.L-1Hg2+胁迫下植株的干重、鲜重均略高于对照,而高浓度呈下降趋势.SOD酶的活性呈现出先升后降的变化,表现出植株对逆境环境具有一定的抗性;而MDA含量均呈增加趋势.

Effects of Hg2＋ with different concentration on Yanghua radish seedlings in terms of dry weight,fresh weight,root top ratio,the chlorophyll a and b content,SOD activeness,MDA content were studied by the method of sand-culture.The result indicated that when Hg2＋concentration was（1mg·L-1～5mg·L-1）under the coercion,adult plant＇s root top ratio was higher than the control group＇s,the chlorophyll content of the leaf increased,and the flowering radish seedling had a strong resistant function to low concentration Hg2＋;however,highly concentrated（20mg·L-1～100mg·L-1） Hg2＋ caused a reduction of the chlorophyll content,and the root top ratio tended to decline.The results of the test also showed the plant＇s dry weight and its fresh weight were both slightly higher than the control group＇s under the stress of（1mg·L-1～5mg·L-1） Hg2＋,whereas high concentrations tended to decrease.The SOD activeness tended to increase first and then decrease,and this shows that plants are of some degrees of resistance to unfavorable environment,but the MDA content tends to increase.