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

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。

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（-0.3MPa） and moderate（-0.5MPa） drought-stress,superoxide dismutase（SOD） activity initially increases,followed by a subsequent decrease,and then sharp decline.Under severe drought-stress（-0.7Mpa）,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.