模拟酸雨和Zn对四季豆根与叶酶活性的影响

Effects of Simulated Acid Rain and Zn on Protective Enzyme Activity in the Leaves and Roots of Phaseolus vulgaeis L

采用盆栽方法,研究了模拟酸雨和Zn复合污染对四季豆根、叶活性酶的影响。结果表明,两种污染的复合使四季豆根、叶MDA含量大于这二者中任何一种的单一污染。相同酸雨下,MDA的含量随着Zn浓度的增加而增加,并且表现出显著的浓度-效应关系,MDA含量的变化能较好地反映四季豆被酸雨和Zn污染的状况。当酸雨强度和Zn浓度增加时,四季豆根、叶SOD活性呈下降的趋势;但酸雨和Zn的胁迫,使四季豆叶中POD的活性呈增加的趋势,根系POD的活性则先增加后下降,说明同一种作物不同的部分对酸雨和Zn的反应不同。

Effects of simulated acid rain and Zn on activity of enzyme in the leaves and roots of Phaseolus vulgaeis L were studied. The contents of MDA in t he roots and leaves of Phaseolus vulgaeis L compound polluted by simulated acid rain and Zn were higher than that single polluted by either simulated acid rain or soil Zn. The contents of MDA increased with the increase of concentrations of soil Zn at the same pH value,showing a striking concentration-response rela tionship, which, therefore, can be reflected well Phaseolus vulgaeis L polluted by simulated acid rain and Zn. The activity of SOD in the roots and leaves decre ased with the decrease of pH value and the increase of the concentration of Zn, while the activity of POD increased in the leaves and increased first then decre ased afterwards in the root system under the stress of simulated acid rain and Z n, which implied that different organs of plants showed varied responses to simu lated acid rain and Zn.