摘要
测定了宁夏沙坡头地区固沙植物油蒿体内活性氧自由基的变化、膜伤害的程度、抗氧化保护酶系统以及光合特性与叶绿素含量的变化 ,对油蒿适应干旱胁迫的机理进行了分析。结果表明 ,灌溉地油蒿的MDA、·O-2 、H2 O2 、脯氨酸的含量以及CAT、SOD的活性低于固定沙丘的油蒿 ,而植物体内蛋白质的含量、POD的活性高于固定沙丘的油蒿。固定沙丘油蒿中的Chla、Chlb含量和H2 O→PCIP电子传递速率低于灌溉地油蒿。因此 。
Adaptive mechanism of Aretmisia ordosica to drought stress was studied by measuring changes of active oxygen free radicals, membrane damages, enzymatic antioxidant defenses and photosynthetic characteristics under two kinds of habitat in Shapotou area, Ningxia. The results indicated that the contents of MDA, ·O - 2, H 2O 2, proline and the activity of CAT and SOD in A. ordosica growing in irrigated lands are lower than those in A. ordosica growing on fixed dunes. On the contrary, the contents of protein, Chla and Chlb, the activity of POD and the rate of electron flow from H 2O to PCIP in A. ordosica growing on fixed dunes are lower than that in A. ordosica growing in irrigated lands. All these results showed that A. ordosica has abilities to adapt drought stress to some extent.
出处
《中国沙漠》
CSCD
北大核心
2002年第4期387-392,共6页
Journal of Desert Research
基金
国家重点基础研究发展规划项目"中国北方沙漠化过程及其防治研究"(G2 0 0 0 0 4870 4)
中国科学院"百人计划"专项基金
中国科学院西部行动计划 (KZCX1 0 9)共同资助
关键词
油蒿
氧化胁迫
活性氧
抗氧化保护酶
抗旱性
固沙植物
Artemisia ordosica
oxidative stress
active oxygen antioxidative defense enzyme
