Hg^(2+)胁迫下玉米生理生态变化的研究

Physiological and ecological response of maize to mercury stress

通过砂培实验,研究汞胁迫下玉米的生理生态指标包括叶绿素含量、根系活力、游离脯氨酸含量的变化。结果表明,汞对玉米的胁迫是浓度和时间双重因子的作用:在低汞浓度、短时间内,叶绿素含量、根系活力及游离脯氨酸含量均有上升的趋势;在高汞浓度、长时间内,各生理指标均严重下降。各生理指标对汞的敏感度略有差异:游离脯氨酸含量>根系活力>叶绿素含量;其中脯氨酸含量可以作为汞污染的一个监测指标。

In this paper, sand-culture medium was used to investigate the physiological and ecological response of maize to mercury pollution stress, including the contents of chlorophyll, the activity of root and free proline. The results show that the toxicity of Hg2+ to maize is controlled by time and concentration of Hg2+: in the low concentration and short time, the indexes increased and decreased afterwards with the increase of the concentration of Hg2+. Every index of the sensitivity to Hg2+ toxicity is different: free proline > the activity of root > the chlorophyll; the contents of free proline may be regarded as the monitoring index of Hg2+ pollution.