Hg^2＋对金银莲花根和叶片的伤害

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。

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

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.