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水体Cu2+对三疣梭子蟹主要组织ROS含量和抗氧化能力的影响

DOI: 10.11654/jaes.2015.07.006

Keywords: 三疣梭子蟹 Cu2+ 活性氧 超氧化物歧化酶 总抗氧化能力

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Abstract:

为探究水体Cu2+对三疣梭子蟹主要组织氧自由基水平和抗氧化能力的影响,采用生态学单因子梯度试验方法,研究了不同浓度水体Cu2+(0.04、0.4、2、4 mg·L-1)胁迫下三疣梭子蟹鳃、肝胰腺、肌肉组织中的活性氧(ROS)含量、超氧化物歧化酶(SOD)活性和总抗氧化能力(T-AOC)的变化。结果表明:与对照组相比,低浓度水体Cu2+(0.04、0.4 mg·L-1)对三疣梭子蟹鳃、肝胰腺和肌肉组织ROS含量没有显著影响,而高浓度水体Cu2+(2、4 mg·L-1)会导致鳃、肝胰腺和肌肉组织ROS含量显著升高,且升高的幅度与Cu2+浓度成正比。低浓度水体Cu2+(0.04、0.4 mg·L-1)对三疣梭子蟹鳃、肝胰腺和肌肉组织的SOD活性和T-AOC均具有诱导作用,随实验时间的延长,SOD活性和T-AOC呈峰值变化;而高浓度水体Cu2+(2、4 mg·L-1)短时间内对梭子蟹的鳃、肝胰腺、肌肉组织的SOD活性及鳃T-AOC具有诱导作用,但对肝胰腺和肌肉T-AOC却有明显的抑制作用,在实验时间内两种组织T-AOC始终低于对照组,并呈逐渐下降趋势。由此说明低于0.4 mg·L-1的水体Cu2+在三疣梭子蟹抗氧化解毒能力的可控范围,但高于2 mg·L-1的水体Cu2+会对三疣梭子蟹主要组织细胞造成损伤,使之抗氧化解毒能力下降。抗氧化酶和非酶抗氧化物在三疣梭子蟹抵御Cu2+胁迫中共同发挥作用,三种组织SOD和T-AOC表现出明显的时间和剂量效应

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