关键词: 细穗柽柳, 干旱胁迫, 生长, 生理生化指标

Abstract: In order to study the mechanism of drought-resistance in Tamarix leptostachys Bunge, this paper took the seedlings of Tamarix leptostachys Bunge with 2 a panicles as materials, and measured the growth and physiological traits of Tamarix leptostachys Bunge seedlings under different drought stresses. The results showed that: the growth of Tamarix leptostachys Bunge seedlings was inhibited by drought stress, including plant height and ground diameter, and its growth rate  decreased gradually. The relative water content, water potential and chlorophyll a/b content in leaf  gradually decreased with the increase of drought stress, while the relative electrical conductivity, malondialdehyde, proline, soluble protein and soluble sugar in leaves  increased significantly. The activity of superoxide dismutase and peroxidase in leaf of Tamarix leptostachys Bunge seedlings showed an increasing trend, and the activity of catalase first increased and then decreased. To sum up, drought stress had significantly affected activities of protective enzymes and content of osmotic adjustment substances in Tamarix leptostachys Bunge seedlings. So Tamarix leptostachys Bunge could be planted and popularized in dry areas due to high drought resistance.

Key words: Tamarix leptostachys Bunge, drought stress, growth, physiological and biochemical index