关键词: 油蒿, 氧化胁迫, 活性氧, 抗氧化保护酶

Abstract: 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, ·O₂^-, H₂O₂, 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.

Key words: Artemisia ordosica, oxidative stress, active oxygen, antioxidative defense enzyme