邻羟基苯甲酸对干旱胁迫下杉木幼苗保护酶的影响

Effect of salicylic acid on antioxidant enzymes of Chinese fir seedling under drought-stress

摘要: 为研究干旱胁迫下杉木自毒物质邻羟基苯甲酸（SA）对杉木幼苗的毒害作用，采用不同浓度的聚乙二醇(PEG-6000)模拟干旱处理，通过水培方法研究干旱胁迫下不同浓度杉木自毒物质邻羟基苯甲酸（SA）对杉木幼苗保护酶的影响。结果表明：在轻度（-0.3 MPa）、中度（-0.5 MPa）干旱胁迫下，随SA浓度增加超氧化物歧化酶（SOD）活性先降后升再下降，但重度（-0.7 MPa）干旱胁迫下，SOD活性直线下降；过氧化物酶（POD）活性则表现为在轻度干旱胁迫下先降后升，中度和重度干旱胁迫下总体呈下降趋势。

Abstract: To study the effects of auto-toxic substances, salicylic acid (SA), on Chinese fir, antioxidant enzyme activity of Chinese fir treated with different concentrations of SA under different degrees of drought-stress (different concentrations of PEG) was investigated. Results show that under slight (-0.3 MPa) and moderate (-0.5 MPa) drought-stress, superoxide dismutase (SOD) activity initially increases, followed by a subsequent decrease, and then sharp decline. Under severe drought-stress (-0.7 Mpa), SOD activity decrease linearly. POD activity shows an initial decline, followed by a rise for a maximum of 21 days under slight drought-stress. However, POD activity shows an overall decline under moderate to severe drought-stress.