模拟酸雨胁迫对银杏部分生理特性的影响

研究模拟酸雨(pH2.0、3.0、4.0、5.6)胁迫对银杏叶片超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、丙二醛(MDA)含量以及质膜透性等生理生化指标的影响。结果表明,pH≤3.0的模拟酸雨对银杏生理特性的影响更为强烈,各个梯度的模拟酸雨胁迫均促使银杏叶片SOD活性和CAT活性急剧上升后稳定在一个较高水平,MDA含量呈先升后降的态势,电解质渗透率在酸雨胁迫后期呈缓慢下降趋势。由此说明,pH 3.0为酸雨对银杏叶片的隐性临界伤害点,也说明银杏能够对酸雨胁迫迅速作出反应,通过长期的酸雨胁迫可能获得某些耐酸的生理特性。

Effects of Simulated Acid Rain on the Physiological Characteristics in Ginkgo

Effects of simulated acid rain treatment on the physiological and biochemical characte-ristics of ginkgo were investigated under different pH value((pH2.0、3.0、4.0、5.6).The results showed that the effect of pH≤3.0 simulated acid rain on ginkgo was stronger than that of others;under the stress of simulated acid rain,the activities of catalase(CAT) and superoxide dismutase(SOD) increased sharply at the beginning and then kept steady-going at a high level,the content of malondialdehyde(MDA) increased at the beginning and then decreased,the rate of electrolyte leakage decreased slowly at the late stage of the stress from simulated acid rain.So pH=3.0 was the recessive critical damage point and ginkgo could respond promptly to the long-term acid rain stress,physiological characteristics about some acid-resistant could be obtained through long-term acid rain stress.