关键词: 乌桕, 内生真菌, 菌丝生长, 脂肪酸组分, 环境因子

Abstract: In a water culture experiment, this paper studied the effects of seed-soaking with La(NO₃)₃ on the seed germination and seedling growth of Brassica napus under Cd stress. The results showed that when the Cd concentration was lower than 10 mg·L^-1, seed-soaking with 0-50 mg·L^-1 of La(NO₃)₃ could enhance seed vigor, promote seedling growth,and increase lipase activity as well as the cell mitosis index of seedling root. The optimal concentration of La(NO₃)₃ was 10 mg·L^-1, under which, lipase activity increased by 40.41%-65.09% and cell mitosis index increased by 62.76%-77.02%,compared with the control. When the Cd concentration was higher than 10 mg·L^-1, seed-soaking with La(NO₃)₃ had an obviously weakened alleviation effect on Cd stress, i. e. , only lipase activity increased significantly, while other indices had little variation.

Key words: Sapium sebiferum, Endophytic fungus, Mycelium growth, Fatty acid composition, Environmental factors