观察了太湖3个不同污染区域内荇菜〔Nymphoides peltatum(Gmel.)O. Kuntze〕叶的形态和结构。结果表明:污染重的贡湖地区荇菜叶片的栅栏组织和海绵组织基本不分化,薄壁细胞发达,细胞间隙小;苏州东太湖和西太湖2个污染较轻的采集点,荇菜叶片的叶肉栅栏组织和海绵组织明显分化,细胞间隙组织发达;3个地点叶片的维管组织逐渐退化。测量数据的统计分析表明:贡湖地区荇菜叶的叶片厚度、栅栏组织厚度和海绵组织厚度等解剖参数与其他2个样点差异显著。而苏州东太湖与西太湖两个区域叶片解剖参数之间,除海绵组织厚度和下表皮厚度有差异外,其他参数无明显差异。

Nymphoides peltatum(Gmel.)O. Kuntze gathered from three differentpolluted areas in Taihu Lake of China were studied to observe morphology and structure of leaf. The results showed that there were no differentiation in palisade and spongy tissues of leaf which have developed parenchyma cell and smaller cell gap in Gonghu Lake where the pollution was serious, While leaf under another two lighter polluted areas—East and West Taihu Lake in Suzhou, obvious differentiation appears in palisade and spongy tissues of mesophyll, with developed cell interval tissue. In addition, all the leaf vascular tissue in three places gradually degenerated. Analysis of variance showed that there were significant difference in anatomy parameters, such as thickness of leaf, palisade and spongy tissues etc. between Gonghu Lake and the other two places. While in another two areas, in addition to thickness of spongy tissue and lower epidermis, the other parameters of leaf were no significant difference.