关键词: 盐芥, 抽苔期, 丙二醛, 质膜透性, 活性氧, 抗氧化酶

Abstract: Thellungiella halophila in its bulting stage was treated with NaCl of different concentration, determining relevant parameters, including the growth amount, the height of single plant, the number of branches and leaves, the membrane leakage, the MDA contents of stem leaves and roots, the superoxide anion（O^-₂）content, the activities of superoxide dismutase (SOD), peroxidase (POD) and calatase (CAT) of stem leaves. The result showed the NaCl lower concentration treatment benefited the fresh and dry weights of T. halophila, but the NaCl higher concentration treatment inhibited those of T. halophila; NaCl treatment made the membrane leakage of leaves increased, the lower concentration NaCl treatment brought about the decrease of membrane leakage of roots, the malondialdehyde (MDA) and O^-₂ contents of leaves while the higher concentration of those made them increased compared with the control plants; the lower concentration of NaCl treatment led to the increase of superoxide dismutase activity (SOD) compared with the control plants, the higher concentration of NaCl treatment brought about the SOD activity decrease, the peroxidase (POD) and calatase (CAT) activities increased after NaCl was treated with different concentration. It proved that lower NaCl concentration treatment benefited the growth of T. halophila, the reactive oxygen species and MDA content decreased; and the NaCl higher concentration treatment, the system of scavenging reactive oxygen species(ROS) coundn’t scavenge the ROS in time, which caused the accumulation of ROS and the damage of membrane, which in turn caused the accumulation of MDA, so the growth of T. halophila was inhibited.

Key words: Thellungiella halophila, bulting stage, malondialdehyde, membrane leakage, reactive oxygen species, antioxidant enzyme