不同逆境条件下辣子草抗氧化酶系统的变化  

Change in Antioxidant Enzymes of Galinsoga parviflora Cav. under Environmental Stresses

作　　者：范雪涛[1,2] 马丹炜[1] 向莎[1] 杨晓娇[1] 钟良文[1] 陈兰[1] 何微[1] 

机构地区：[1]四川师范大学生命科学学院,成都610066 [2]雅途生物技术(成都)有限公司,成都610041

出　　处：《应用与环境生物学报》2008年第5期616-619,共4页Chinese Journal of Applied and Environmental Biology

基　　金：成都市科技局攻关计划项目(No. 200638)资助~~

摘　　要：辣子草（Galingoga parviflora Cav．）原产南美洲，1915年在我国云南和四川等地被发现，是一种危害较严重的外来人侵种，研究其在逆境条件下的生理适应机制对于有效预警和治理该入侵种具有十分重要的意义．采用人工设置温度梯度和自然干旱方法，研究了在不同环境胁迫条件（温度和干旱1下辣子草抗氧化酶系统和丙二醛（MDA）的变化．结果表明：在10-30℃范围内，辣子草抗氧化酶系统变化趋势不一致，MDA含量未出现显著性变化；在5℃、35℃和45℃胁迫下，抗氧化酶系统受到损伤，MDA含量显著上升；在干旱胁迫条件下，抗氧化酶系统先上升，后下降，MDA含量在干旱胁迫后期含量显著上升．应用Fuzzy方法，对辣子草抗氧化酶在2种逆境不同水平胁迫下的动态进行综合评价，认为其对低温环境具有较强的耐受能力，对干旱环境的耐受性较差．Galinsogaparviflora Cav., native to South America, was first recorded in Yunnan and Sichuan in 1915. Now, it widely occurs in China as an invasive plant. Study on its invasive mechanism and physiological response under stressful environments is very useful to control this plant. By using artificial temperature gradients and naturally drying method, the changes of antioxidant enzymes and monodehydroascorbate （MDA） in G. parviflora were studied under different environmental stresses. The result showed that the changes of antioxidant enzymes in G. parviflora differred from 10 ℃ to 30 ℃, while MDA was found with no significant change. Antioxidant enzymes were damaged and MDA contents obviously increased at 5 ℃, 30℃ and 35 ℃. For the drought treatments, the antioxidant enzymes increased at the beginning and decreased then, while MDA increased only at later stage. The results by using Fuzzy synthetic evaluation indicated that G. parviflora had a better tolerance to low temperature than did to heat and drought stresses.

关 键 词：辣子草 抗氧化酶 入侵植物 环境胁迫 

分 类 号：S451[农业科学—植物保护] Q945.78[生物学—植物学]