中文摘要：

通过室内水培圆叶无心菜幼苗，研究不同浓度Pb对圆叶无心菜生长、叶绿素含量、丙二醛含量和细胞膜透性的影响。结果表明，随着Pb处理浓度的增加，植物生长受到抑制，叶绿素含量呈现先上升后下降的变化趋势，丙二醛含量和细胞膜透性均呈上升的变化趋势。铅浓度为50mg·L^-1时，圆叶无心菜株高、根长以及生物量和叶绿素含量均比对照含量有所增加；铅浓度大于100mg·L^-1时，植株株高和根长的生长受到抑制，地上部鲜重和地下部鲜重均减少，叶绿素含量降低，丙二醛含量和细胞膜透性都显著增加。

英文摘要：

Water culture experiments were conducted in order to understand the effects of lead on the growth, chlorophyll contents, melondialodehyde （MDA） contents and permeability of cell membrane （CMP）. The results showed that the plant was strongly inhibited with increases in Pb concentrations and the chlorophyll content increased with low Pb concentration, then decreased with increase in Pb concentration. Melondialodehyde （MDA） contents and permeability of cell membrane （CMP） were increased. With treatment Pb = 50 mg · L^-1, the height, root length, biomass and chlorophyll contents increased but MDA and CMP kept stable. With treatment Pb 〉 100 mg · L^-1 , the plant was short. The biomasses of shoot and root in fresh matter decreased. Chlorophyll contents decreased and MDA and CMP increased.