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作 者 ：徐燕云;;吴晓梅;沈秋仙;曹同;郭水良

期 刊 ：武汉植物学研究 2010年 28卷 5期 页码：606-611

关键词：苔藓植物；大灰藓；铅胁迫；生理指标；环境指示；

Keywords:Bryophyte, Hypnum plumaeforme, Pb stress, Physiological indices, Environmental indicator,

摘 要 ：苔藓植物是对环境最为敏感的指示植物之一。灰藓属(Hypnum)植物被广泛用于监测环境污染。为了更好地了解藓类植物对重金属的胁迫反应,测定了不同Pb浓度胁迫下大灰藓总叶绿素含量、丙二醛、脯氨酸和可溶性糖生理指标,并对4种生理指标与铅浓度之间进行了拟合。研究结果显示,在低浓度Pb(<0.01mmol/L)胁迫下,总叶绿素含量升高。当Pb浓度≥1mmol/L时,总叶绿素含量下降。而丙二醛、脯氨酸及可溶性糖含量则在低Pb浓度(≤0.1mmol/L)下增加不明显,在较高Pb浓度(≥1mmol/L)下均有明显的升高,表现出对铅胁迫的适应性反应。4种生理指标与铅胁迫浓度之间表现出较好的剂量-效应关系。

Abstract:Bryophytes are a group of plants considered to be sensitive indicators of air pollution.Hypnum has been widely used to monitor air pollution across the world.To better understand the response of moss to heavy metal stress,the contents of chlorophyll,proline,malonaldehyde(MDA),and soluble sugar of Hypnum plumaeforme under different concentrations of Pb were analyzed.The results showed that chlorophyll content of H.plumaeforme increased under low concentration of Pb(<0.01 mmol/L),but decreased under high concentration of Pb(≥1 mmol/L).The contents of proline,malonaldehyde(MDA),and soluble sugar increased slightly under lower concentration of Pb(≤0.1 mmol/L)and increased significantly under higher concentration of Pb(≥1 mmol/L).The results indicated that the moss reacted to Pb stress well to protect itself.Analysis of linear regression results showed a good dose-effect relationship between the four physiological indices and the different concentrations of Pb.

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