Effects of Combined Stress of Acid Rain and Heavy Metals on Resistant Physiological Indexes of Gynostemma pentaphyllum
Su Tao
Si Meiru
Wang Renjun
Tang Meizhen
Abstract：A pot experiment was conducted to study the effects of single or combined stress of Zn (30, 400 mg/kg), Cd (1, 15 mg/kg) and acid rain varying in pH value on physiological indexes of resistance of Gynostemma pentaphyllum.The results showed that with the increase of acidity of acid rain and concentration of metal ( Zn or Cd) , the malondialdehyde ( MDA) content and peroxidase ( POD) activity in leaves of Gynos-temma pentaphyllum increased , and the superoxide dismutase ( SOD ) activity increased firstly and then de-creased .The catalase ( CAT) activity decreased with the increase of acidity of acid rain , but increased firstly and then decreased with the increase of heavy metal ( Zn or Cd ) concentration .The combined stress effect of high-acidity acid rain and high -concentration Zn-Cd on physiological indexes of resistance of Gynostemma pentaphyllum was greater than their single factor effect , which showed obvious synergistic effect .Regardless of the acigity of acid rain , the combined stress effects of low concentrations of Zn -Cd on physiological indexes of Gynostemma pentaphyllum was less than their single effect , so it showed obvious antagonistic effect .
Keywords：Acid rainHeavy metalGynostemma pentaphyllumPhysiological indexes of resistance
Publication Date：2014-08-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 61-65 )