遭受模拟酸雨和镉胁迫下木荷幼苗的生理响应。
Physiological responses of Elaeocarpus glabripetalus seedlings exposed to simulated acid rain and cadmium.
机构信息
School of Forestry and Biotechnology, Zhejiang A&F University, Lin'an 311300, China.
Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O. Box 27 (Latokartanonkaari 5), FI-00014, Finland.
出版信息
Ecotoxicol Environ Saf. 2019 Jul 15;175:118-127. doi: 10.1016/j.ecoenv.2019.03.026. Epub 2019 Mar 18.
Combined effects of cadmium (Cd) and acid rain on physiological characteristics in Eleocarpus glabripetalus seedlings were investigated under controlled conditions. The single Cd treatment and the combined Cd and acid rain treatment increased growth at low Cd concentrations, while decreased growth and photosynthesis at high Cd concentrations. A low Cd concentration (50 mg kg) combined with different acid rain treatments increased the seedling biomass. A high Cd concentration (100 mg kg) under different acid rain treatments significantly decreased the biomass, the Fe content, chlorophyll fluorescence and photosynthetic parameters. Relative electric conductivity, malondialdehyde (MDA) content and peroxidase (POD) activity were increased while the reduced glutathione (GSH) content and catalase (CAT) activity were significantly lower at high Cd concentration under acid rain. The results indicated that the combination of a high concentration of Cd and acid rain aggravated the toxic effect of Cd or acid rain alone on the growth and physiological parameters of E. glabripetalus due to serious damage to the chloroplast structure. These results provide novel insights into the combined effects of Cdand acid rain on woody plants and might also serve as a guide to evaluate forest restoration and biological safety in areas with Cdand acid rain pollution.
在控制条件下，研究了镉（Cd）和酸雨对光滑叶水青冈幼苗生理特性的综合影响。单一 Cd 处理和 Cd 与酸雨的联合处理在低 Cd 浓度下促进了生长，而在高 Cd 浓度下则降低了生长和光合作用。低 Cd 浓度（50mg/kg）与不同酸雨处理相结合增加了幼苗生物量。不同酸雨处理下的高 Cd 浓度（100mg/kg）显著降低了生物量、Fe 含量、叶绿素荧光和光合作用参数。在酸雨下，高 Cd 浓度下的相对电导率、丙二醛（MDA）含量和过氧化物酶（POD）活性增加，而还原型谷胱甘肽（GSH）含量和过氧化氢酶（CAT）活性显著降低。结果表明，由于对叶绿体结构的严重破坏，高浓度 Cd 和酸雨的结合加剧了 Cd 或酸雨单独对光滑叶水青冈生长和生理参数的毒性作用。这些结果为 Cd 和酸雨对木本植物的综合影响提供了新的见解，并可能为评估 Cd 和酸雨污染地区的森林恢复和生物安全性提供指导。
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