Effects of 1-aminobenzotriazole on the growth and physiological characteristics of Tamarix chinensis cuttings under salt stress

• 作者: Jia Sun Jiangbao Xia Ximei Zhao Li Su Chuanrong Li Ping Liu
• 来源期刊: 林业研究（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1641-1651
• 页数: 11页
• 语种: 英文

摘要

Vegetation restoration is a main ecological reme-diation technology for greening saline and alkaline soils. The objectives of this study were to determine the effect of 1-aminobenzotriazole (ABT-1) on the growth and physiol-ogy of Tamarix chinensis under salt stress and to determine a suitable ABT-1 concentration and soil salinity ( S c) for propagating T. chinensis- cuttings. Cuttings were soaked in water and ABT-1 solutions at three concentrations(50, 100, and 200 mg L ?1 ) and propagated in pots containing four soil salinity levels, mild (0.3％), moderate (0.6％), and severe (0.9％ and 1.2％), and compared with a control. The cuttings were measured to determine growth indices and physiologi-cal and biochemical indices (e.g., chlorophyll content, super-oxide dismutase activity, peroxidase activity, and malondial-dehyde content). ABT-1 was effective in improving survival, growth, and physiological processes of cuttings under salt stress. However, there was a threshold effect when using ABT-1 to facilitate propagation under salt stress. ABT-1 effects were insignificant when applied at low concentrations (< 100 mg L ?1 ). At a high concentration (> 100 mg L ?1 ), ABT-1 limited growth and physiological activities. Under a salt stress level ( S c ≤ 0.9％), ABT applied at a 100 mg L ?1 concentration increased chlorophyll content and superox-ide dismutase and peroxidase activities in the leaves and reduced malondialdehyde accumulation and membrane lipid peroxidation effects. As a result, ABT-1 enhanced the resist-ance of T. chinensis to salt stress. However, under high salt stress (> 0.9％) and ABT-1 concentration (> 100 mg L ?1 ), the physiological regulatory ability of T. chinensis seedlings weakened. T. chinensis grew well at a salt stress ≤ 0.9％ and ABT ≤ 100 mg L ?1 and exhibited relatively high physiologi-cal regulatory ability and high salt adaptability.