Wang Xiao-Fei, Zhou Qi-Xing
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, P.O. Box 417, Shenyang 110016, China.
Chemosphere. 2005 Jun;60(1):16-21. doi: 10.1016/j.chemosphere.2004.12.031.
Ecotoxicological effects of cadmium (Cd) on three ornamental plants African marigold (Tagetes erecta), scarlet sage (Salvia splendens) and sweet hibiscus (Abelmoschus manihot) were investigated. Seeds of these plants were exposed to five different concentrations of Cd (0-50 mgl(-1)). Ecotoxicological indexes based on inhibition rate (IC) of seed germination, root and shoot elongation, biomass (fresh weight and dry weight), as well as IC50 (Cd concentration when 50% plants show inhibition) and tolerance indexes (the ratio of maximum root length in an experimental group to that in a control group) were determined. The results indicated that Cd had little effects (p>0.05) on seed germination of the three plants and shoot elongation of scarlet sage (S. splendens). Cadmium had significant (p<0.05) inhibitory effects on root elongation of the three plants and shoot elongation of African marigold (T. erecta). The fresh weight biomass of scarlet sage (S. splendens) was most sensitive to Cd, while that of sweet hibiscus (A. manihot) was least sensitive. On a dry weight basis, African marigold (T. erecta) was the least sensitive, and scarlet sage (S. splendens) was the most sensitive to Cd. Based on IC50 of seed germination, sweet hibiscus (A. manihot) was the most insensitive plant with an IC50 value as high as 428.0 gl(-1). According to Cd-tolerance indexes under the same Cd concentration, sweet hibiscus (A. manihot) was the most tolerant plant whereas scarlet sage (S. splendens) was the most sensitive one.
研究了镉（Cd）对三种观赏植物万寿菊（Tagetes erecta）、一串红（Salvia splendens）和黄秋葵（Abelmoschus manihot）的生态毒理效应。将这些植物的种子暴露于五种不同浓度的镉（0 - 50 mg l⁻¹）中。测定了基于种子发芽抑制率（IC）、根和茎伸长、生物量（鲜重和干重）的生态毒理指标，以及IC50（50%植物表现出抑制时的镉浓度）和耐受指数（实验组最大根长与对照组最大根长之比）。结果表明，镉对这三种植物的种子发芽和一串红（S. splendens）的茎伸长影响较小（p>0.05）。镉对这三种植物的根伸长和万寿菊（T. erecta）的茎伸长有显著（p<0.05）抑制作用。一串红（S. splendens）的鲜重生物量对镉最敏感，而黄秋葵（A. manihot）最不敏感。以干重计，万寿菊（T. erecta）对镉最不敏感，一串红（S. splendens）对镉最敏感。基于种子发芽的IC50，黄秋葵（A. manihot）是最不敏感的植物，IC50值高达428.0 g l⁻¹。根据相同镉浓度下的镉耐受指数，黄秋葵（A. manihot）是最耐受的植物，而一串红（S. splendens）是最敏感的植物。
