邻羟基苯甲酸对不同化感型杉木无性系抗氧化酶活性的化感效应
首发时间:2010-01-25
摘要:自毒作用是导致杉木林连栽地力衰退、生产力下降的主要原因之一,邻羟基苯甲酸是杉木酚酸类主要自毒物质之一。以筛选的自毒物质忍耐型和自毒物质敏感型杉木无性系为试验材料,分析邻羟基苯甲酸对2个不同化感型杉木无性系抗氧化酶活性的化感效应。研究结果表明,邻羟基苯甲酸各胁迫浓度对不同化感型杉木无性系SOD活性的化感效应在胁迫初期、中期表现为促进效应,胁迫后期转变为抑制效应,2个无性系SOD活性化感效应的差异主要从胁迫中期开始;各胁迫浓度对2个无性系叶片POD及AsA-POD活性的化感效应在均表现为促进效应,胁迫第10天、20天时,各胁迫浓度对01号无性系POD活性的促进效应明显大于02号;01号无性系PPO活性在胁迫下均表现为促进效应,而02号无性系则随胁迫延长表现为抑制-促进-抑制的变化特点。
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Allelopathic Effects of Salicylic Acid on Activity of Antioxidant Enzymes of Different Allelopathic type of Chinese fir Clones
Abstract:Autotoxicity is one of the main reasons of land degradation and productivity decline in Continuous-planting Chinese fir plantations, and salicylic acid is one of the Chinese-fir autotoxins. In this study, the autotoxins-tolerant type and autotoxins-sensitive type of Chinese fir clone were used as the experimental materials, stress experiment had been carried out to analyze the allelopathic effects of salicylic acid on antioxidant enzymes of the two kinds of Chinese fir clones. Results were as follows: Under all concentration levels, the stimulatory effects on SOD activities occurred at the initial period and the intermediate stage, but transformed into inhibitory effect at the later period, and the differences of allelopathic effects on SOD activities of two kinds of clones showed from the intermediate stage; Salicylic acid stress performed stimulatory impact on POD and AsA-POD activities of two clones leaves throughout the whole stress period, at the 10th day and 20th day, the stimulatory effect on the POD activity of No.01 obviously bigger than that of No.02; As far as the PPO activity was concerned, salicylic acid stress performed stimulatory effect on No.01 but the effect on No.02 displayed the characteristics of inhabitation-stimulation-inhabitation with the prolonging time.
Keywords: Chinese fir antioxidant enzymes Salicylic acid Allelopathy
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