title: Effects of Pb stress on nutrient uptake and secondary metabolism in submerged macrophyte Vallisneria natans.
abstract: 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.
authors: Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
authors: Chao
authors: C
authors: Wang
authors: Jie
authors: J
authors: Lu
authors: Songhe
authors: S
authors: Zhang
authors: Peifang
authors: P
authors: Wang
authors: Jun
authors: J
authors: Hou
authors: Jin
authors: J
authors: Qian
mesh_terms: D000429:Alcohol Oxidoreductases / Q000378:metabolism; D004156:Catechol Oxidase / Q000378:metabolism; D003300:Copper / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005419:Flavonoids / Q000378:metabolism; D031321:Hydrocharitaceae / Q000187:drug effects* / Q000378:metabolism; D007501:Iron / Q000378:metabolism; D007854:Lead / Q000378:metabolism / Q000633:toxicity*; D008345:Manganese / Q000378:metabolism; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D013312:Stress, Physiological; D014131:Trace Elements / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*; D015032:Zinc / Q000378:metabolism
chemical_list: D005419:Flavonoids; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D007854:Lead; D008345:Manganese; D003300:Copper; D007501:Iron; D000429:Alcohol Oxidoreductases; C022641:Shikimate dehydrogenase; D004156:Catechol Oxidase; D010650:Phenylalanine Ammonia-Lyase; D015032:Zinc