State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
Environ Toxicol Chem. 2013 Aug;32(8):1746-51. doi: 10.1002/etc.2237. Epub 2013 Jun 6.
Cadmium is one of the most toxic elements. The ideal vegetal cover should be ensured by the selection of appropriate plant species for successful phytoremediation. In the present study, the ecotoxicological effects of Cd on the following 3 ornamental herbs were investigated: Italian ryegrass (Lolium multiflorum Lam.), white clover (Trifolium repens L.), and alfalfa (Medicago sativa L.). Based on the inhibition rate of seed germination, root and shoot elongation, early seedling growth, median inhibition concentration (IC50) values, and index of tolerance (IT) values, ecotoxicological indicators were determined. The results showed that 10 μM to 50 μM Cd had little effect on seed germination or root and shoot elongation of the 3 ornamental herbs (p > 0.01). With an increase in Cd concentrations, alfalfa (M. sativa) was the most sensitive to Cd toxicity in terms of seed germination and root elongation. Based on the IC50 of root elongation, Italian ryegrass (L. multiflorum) was the least sensitive to Cd. Based on the IC50 of seed germination and shoot elongation, white clover had the least sensitivity to Cd. Among the 3 ornamental herbs, based on the IC50 of seed germination and root and shoot elongation, alfalfa (M. sativa) was all the most sensitive plant. According to the index of tolerance, Italian ryegrass (L. multiflorum) was the most tolerant plant.
镉是毒性最强的元素之一。通过选择合适的植物物种来成功进行植物修复，应该确保理想的植被覆盖。在本研究中，研究了镉对以下 3 种观赏草本植物的生态毒理学影响：黑麦草（Lolium multiflorum Lam.）、白三叶草（Trifolium repens L.）和紫花苜蓿（Medicago sativa L.）。根据种子发芽率抑制率、根和芽伸长、早期幼苗生长、半抑制浓度（IC50）值和耐度指数（IT）值确定生态毒理学指标。结果表明，10μM 至 50μM 的 Cd 对 3 种观赏草本植物的种子发芽或根和芽伸长几乎没有影响（p＞0.01）。随着 Cd 浓度的增加，紫花苜蓿（M. sativa）在种子发芽和根伸长方面对 Cd 毒性最敏感。根据根伸长的 IC50，黑麦草（L. multiflorum）对 Cd 的敏感性最低。根据种子发芽和芽伸长的 IC50，白三叶草对 Cd 的敏感性最低。在这 3 种观赏草本植物中，根据种子发芽和根芽伸长的 IC50，紫花苜蓿（M. sativa）是最敏感的植物。根据耐度指数，黑麦草（L. multiflorum）是最耐受的植物。
