汞污染对金银莲花叶片细胞超微结构的影响

对重金属离子Ｈｇ２＋ 胁迫下金银莲花形态学伤害和幼叶细胞亚显微结构的变化进行了研究．随着Ｈｇ２＋ 处理浓度升高或处理时间延长，金银莲花形态学受害程度加深、细胞亚显微结构受损严重．细胞核表现为先是核仁边界模糊、染色质凝聚（４ ｍ ｇ／Ｌ），接着核膜少量溶解、核基质呈无序状态（８ ｍ ｇ／Ｌ），最后核膜完全溶解，核基质散入细胞质中（１６ ｍ ｇ／Ｌ）．叶绿体从低浓度到高浓度，先是叶绿体发生形变、类囊体受挤压，接着基粒膨胀或解体、类囊体散乱排列，最后叶绿体内外膜破坏、基质流出、类囊体翻转．晶体细胞和巨型淀粉粒也清晰可见．

Studies on the Effect of Hg2+Pollution on Leaf's Ultrastructure of Nymphoides indica(L.)O.Kuntze

This paper mainly deals with the morphological changes and the ulstrastructure in new leaves of Nymphoides indica (L.)Kuntze by the stress of Hg 2 pollution.With more treatment time or with higher cultural concentration,degree of the morphological injury is becoming more deeply.Distracted degree of ultrastructure in cells increases as the treated concentration rising.Firstly, the border of nucleous is unclear,chromatin cotracts(4 mg/L).Nuclear membrane dissolves a little,nucleoplasm appears very disorderly in 8 mg/L Hg 2 solution.Finally,nuclear membrane disappears completely,nucleoplasm flows into the cytoplasm(16 mg/L).Chloroplasts change their shapes,so layers of granas and granas are crashed in 4 mg/L Hg 2 polluted water.Plastid granas either swelled or disintegrates,layers of granas get disorderly in 8 mg/L solution.In 16 mg/L concentration,chloroplast envelopes get disrupted,plastoglobuli in the chloroplast flows into cytoplasm,layers of granas are entering the cytoplasm too.Crystal cells and huge starch grains can be seen clearly.