Hg^(2+)对金银莲花根和叶片的伤害

Injury of Hg 2+ on roots and leaves of Nymphoides indica (L.) Kuntze

研究了汞离子胁迫下金银莲花〔Ｎｙｍｐｈｏｉｄｅｓｉｎｄｉｃａ（Ｌ．）Ｋｕｎｔｚｅ〕根受害情况、根部过氧化物酶活性和新叶叶绿素含量的变化。根部受害程度随汞离子浓度升高和处理时间的延长而加重。低浓度Ｈｇ２＋短时间处理后根过氧化物酶活性升高，而高浓度Ｈｇ２＋长时间处理后根过氧化物酶活性下降，且随着Ｈｇ２＋浓度的升高或处理时间的延长过氧化物酶活性均呈下降趋势。新叶叶绿素含量对Ｈｇ２＋胁迫的反应与根过氧化物酶活性的变化相似。

The injury degree of roots, the activity of peroxidase in roots and chlorophyll content in new leaves of Nymphoides indica by the stress of Hg 2+ are reported. Injury degree of roots were intensitied with the increase of Hg 2+ concentration or as treatment time is continued. The activity of peroxidase increased under the treatement with low concentration of Hg 2+ in a short time, but decreased as treatment time is continued. The stress of Hg 2+ had the similiar effects on chlorophyll content in new leaves.