汞对水稻幼苗部分生理生化指标的影响

Effects of Mercury on Some of Physiological Indicators of Rice Seedlings

目的：探究Hg2＋对水稻幼苗生长的影响。方法：通过水培实验,研究分析了水稻幼苗在不同浓度Hg2＋（0-2.0mmol/L）胁迫下株高、鲜重、叶绿素含量和过氧化物酶（POD）活性的变化。结果：表明0.05mmol/L的Hg2＋短时间内对水稻幼苗生长有一定的促进作用,高于0.05mmol/L的处理,随着Hg2＋浓度的增加,植株生长明显受到限制。当Hg2＋浓度≤0.1mmol/L时,POD活性先上升后下降,而Hg2＋浓度≥0.5mmol/L时则持续降低。结论：Hg2＋对水稻幼苗生长抑制程度与处理浓度和处理时间成正相关。

Objective：Tne effect of Hg^2＋ on rice seedling growth was studied. Methods：Tne effect of Hg^2＋ treatment （0- 2.0mmol/L） on seedling height, fresh weight, chlorophyll content and activity of POD was studied by water- culture medium. Results： Growth of rice seedling was promoted at 0.05mmol·L^-1 of Hg^2＋, in the short time. But the rice seedling growth was inhibited when the concentration of Hg^2＋ were increased. Activity of POD had a resistant peak and decreased afterward in lower concentration of Hg^2＋ （0.05 - 0. 1 mmnol·L^-1 ）, and higher concentration of Hg^2＋ （0.5- 2.0 mmol·L^-1 ） treatment could reduced it. Conclusion：The inhibition of Hg^2＋ on rice seedling growth had a positive with culture concentration and time.