微尼海双眉藻对重金属短期胁迫的生理及形态响应
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国家自然科学基金(31470308,31601866);


Physiological and Morphological Responses of Halamphora veneta (Kützing) Levkov to Acute Heavy Metals Stress
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    摘要:

    为了探讨底栖硅藻微尼海双眉藻[Halamphora veneta (Kützing) Levkov] 对重金属胁迫的响应机制,该研究分析了不同浓度的4种重金属Cu2+、Hg2+、Cd2+和Pb2+对微尼海双眉藻处理96 h后,其细胞密度、叶绿素a含量、丙二醛含量以及形态结构的变化。结果显示:(1)低浓度的重金属处理会促进微尼海双眉藻的生长,而高浓度的重金属胁迫会抑制微尼海双眉藻的生长。(2)微尼海双眉藻叶绿素a对较低浓度的Cu2+、Hg2+、Cd2+和Pb2+胁迫均比较敏感,表明叶绿素a含量可以成为硅藻反映重金属含量的有效指标。(3)低浓度的重金属胁迫对微尼海双眉藻的丙二醛含量影响不明显,而高浓度的重金属胁迫会促进微尼海双眉藻的丙二醛含量显著升高。(4)Cu2+、Cd2+和Pb2+胁迫不会引起微尼海双眉藻的明显细胞形变,而低浓度Hg2+胁迫就会使微尼海双眉藻出现细胞膨大及畸形等变化。研究表明,微尼海双眉藻对于重金属胁迫具有某种耐受机制,其叶绿素a含量以及形态变化可以作为水体重金属污染的监测指标。

    Abstract:

    To investigate the response mechanism of Halamphora veneta (Kützing) Levkov to heavy metal stress, we analyzed the effects of different concentrations of four heavy metal, including Cu2+,Hg2+,Cd2+ and Pb2+ treatments on its cell density, chlorophyll a, malondialdehyde content and morphological changes. The results showed that:(1) low concentration of heavy metal treatment promoted the growth of H. veneta (Kützing) Levkov, while high concentration of heavy metal inhibited the growth of H. veneta (Kützing) Levkov. (2) The results of chlorophyll a showed that the H. veneta (Kützing) Levkov was sensitive to low concentration of Cu2+, Hg2+, Cd2+ and Pb2+, thus the chlorophyll a content of diatoms could be an effective index for the heavy metal monitor. (3) It is showed that the effect of low concentration of Cu2+,Hg2+,Cd2+ and Pb2+ on the malondialdehyde (MDA) content in H. veneta (Kützing) Levkov was not obvious, while the content of MDA in the H. veneta (Kützing) Levkov was promoted by the high concentration of heavy metal. (4) The morphological changes of the cells showed that Cu2+, Cd2+and Pb2+ treatment did not cause obvious deformation of H. veneta (Kützing) Levkov, and Hg2+ treatment could cause the expansion and deformity of the cells. The above results showed that the H. veneta (Kützing) Levkov possess tolerance mechanism for heavy metal stress, meanwhile, its chlorophyll a content and morphological changes could be used as the water monitoring index for heavy metal pollution.

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李 新,付志鑫,母伟杰,等.微尼海双眉藻对重金属短期胁迫的生理及形态响应[J].西北植物学报,2017,37(9):1813-1822

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  • 在线发布日期: 2017-10-23
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