摘要
我们在暴露于集中的一个范围的七植物种调查了植物毒性(0500 mg ?? 瑥票桬硥汹 ? 瀠?慨慬整 ?? 慭潬摮慩摬桥摹 ? 鮼 ? ?? 首?? ??? 貼戠貒挠牡瑯湩楯獤 ?? 鮼 ? 攭 ?? 拄吗??
We investigated phytotoxicity in seven plant species exposed to a range of concentrations (0- 500 mg· kg^-1 soil) of di-n-butyl phthalate (DnBP) or his (2- ethylhexyl) phthalate (DEHP), two representative phthalate esters (PAEs) nominated by USEPA as priority pollutants and known environmental estrogens. We studied seed germination, root elongation, seedling growth, biomass (fresh weight, FW) and malondialdehyde (MDA) content of shoots and roots of wheat (Triticum aestivum L.), alfalfa (Medicago sativa L.), perennial ryegrass (Lolium perenne), radish (Raphanus sativus L.), cucumber (Cucumis sativus L.), oat (Avena sativa) and onion (Allium cepa L.), together with monitoring of plant pigment content (chlorophyll a, b and earotinoids) in alfalfa, radish and onion shoots. Root elongation, seedling growth and biomass of the test species were generally inhibited by DnBP but not by DEHP, indicating a lower level of phytotoxicity of DEHP than of DnBP. MDA contents of four species were promoted by PAE exposure, but not in alfalfa, ryegrass or onion shoots, indicating lower sensitivity of these three species to PAE pollutants. Plant pigment contents were clearly affected under the stress of both pollutants, implying the potential damage to the photosynthetic system of test plants, mainly by decreasing the content of chlorophyll a and b. Results of DnBP and DEHP phytotoxicity to the primary growth of test plants has provided information for the assessment of their environmental risk in the soil and also forms a basis for the further analysis of their toxic effects over the whole growth period of different plant species.
关键词
邻苯二甲酸酯
植物物种
乙基己基
正丁基
药害
多年生黑麦草
优先污染物
MDA含量
phytotoxicity, di-n-butyl phthalate, bis(2- ethylhexyl) phthalate, malondialdehyde, plant pigments(chlorophyll a, b and carotinoids)