Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
Ecotoxicol Environ Saf. 2011 Jul;74(5):1297-303. doi: 10.1016/j.ecoenv.2011.03.005. Epub 2011 Mar 26.
For better understanding the metabolic adaptations to Pb stress in submerged plants, the alterations in mineral elements uptake and in secondary metabolism were studied in leaves of Vallisneria natans (Lour.) Hara exposed to 0-100μM Pb for 0-7d. Pb content increased in leaves in a dose-dependent way. The increase of calcium, magnesium and iron content and the decrease of phosphorus, potassium and manganese content were detected in leaves of V. natans under Pb stress, while no significant changes were detected in copper and zinc concentration. Meanwhile, there was an increase in the concentrations of total phenolic and flavonoids. Pb treatment caused an increase in the catalytic activities of shikimate dehydrogenase, phenylalanine ammonialyase and polyphenol oxidase. The results suggest that nutrient uptake and secondary metabolism were actively regulated by V. natans plants in response to Pb stress.
为了更好地理解水生植物对 Pb 胁迫的代谢适应，研究了暴露于 0-100μM Pb 0-7d 的水苦荬（Lour.）Hara 叶片中矿质元素吸收和次生代谢物的变化。Pb 含量呈剂量依赖性增加。在 Pb 胁迫下，水苦荬叶片中钙、镁和铁含量增加，磷、钾和锰含量减少，而铜和锌浓度没有明显变化。同时，总酚和类黄酮的浓度也有所增加。Pb 处理导致莽草酸脱氢酶、苯丙氨酸氨裂解酶和多酚氧化酶的催化活性增加。结果表明，水苦荬植物通过主动调节养分吸收和次生代谢来应对 Pb 胁迫。
