关键词: 荆芥, 氯化钙, 盐胁迫, 种子萌发, 生理特性

Abstract: In order to study the effects of calcium chloride soaking seeds on the germination and physiological characteristics of Schizonepeta tenuifolia Briq. under salt stress, the seeds  were soaked in different concentrations of CaCl₂ (2.5, 5, 10, 20 and 40 mmol·L^-1). The germinations of seed and physiological characteristics of  seedling were measured in 150 mmol·L^-1 NaCl solution. The results showed that the seed germination and seedling growth of Schizonepeta tenuifolia Briq. were obviously inhibited under 150 mmol·L^-1 NaCl stress. Compared with salt stress treatment without CaCl2, soaking seeds of CaCl2 could improve the germination rate, germination potential, germination index, vigor index of seeds and the height, root length, fresh weight of seedlings. And the activities of superoxide dismutase, peroxidase and catalase of seedlings were increased, while the contents of malonaldehyde were decreased after CaCl₂ soaking. In addition, the contents of proline and soluble protein of seedlings were decreased after CaCl₂ soaking. These results indicated that CaCl₂ soaking could alleviate the damage under salt stress, and the effect of the treatment with 20 mmol·L-1 CaCl₂ was the best, which provided theoretical basis and technical reference for the cultivation and production of Schizonepeta tenuifolia Briq. in saline land area.

Key words: Schizonepeta tenuifolia Briq., CaCl2, salt stress, seed germination, physiological characters