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海洋通报  2012 

龙须菜对重金属汞胁迫的生理响应

DOI: 10.11840/j.issn.1001-6392.2012.4.016, PP. 460-465

Keywords: 汞胁迫,相对生长速率,色素,叶绿素荧光,光合作用,龙须菜

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Abstract:

本文研究了大型海藻龙须菜(Gracilaria?lemaneiformis)对不同浓度重金属汞(0、0.02、0.04、0.10、0.20和0.40?mg/L)胁迫的生理响应。结果表明:当Hg2+浓度≥0.02?mg/L时,龙须菜藻体的相对生长速率显著下降,并且当Hg2+浓度达到0.20和0.40?mg/L时,龙须菜出现负增长。随着Hg2+浓度的升高,龙须菜藻体的最大光化学量子产量、最大净光合速率和表观光合效率逐渐下降,叶绿素a、类胡萝卜素和藻胆蛋白含量则呈先升高后下降的趋势,且当Hg2+浓度≥0.10?mg/L时,叶绿素a、类胡萝卜素和藻胆蛋白含量显著下降。说明龙须菜在受Hg2+胁迫的环境中耐受性较差,且Hg2+对龙须菜的毒害作用较大,当Hg2+浓度≥0.02?mg/L时,龙须菜藻体的生理活动就会受到显著抑制。

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