Evaluation of Mercury Stress in Plants from the Almad茅n Mining District by Analysis of Phytochelatins and Their Hg Complexes

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• 作者：脌ngela Dago ; Inmaculada Gonz谩lez ; Cristina Ari帽o ; Alba Mart铆nez-Coronado ; Pablo Higueras ; Jos茅 Manuel D铆az-Cruz ; Miquel Esteban
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：June 3, 2014
• 年：2014
• 卷：48
• 期：11
• 页码：6256-6263
• 全文大小：308K
• 年卷期：v.48,no.11(June 3, 2014)
• ISSN：1520-5851

文摘

To evaluate plant response to Hg stress, glutathione, phytochelatins, and their Hg complexes were analyzed using HPLC with amperometric detection in samples of Asparagus acutifolius grown in the Almad茅n mining district (Ciudad Real, Spain), one of the most Hg-contaminated sites in the world. Soils of the Almad茅n mining district, and specifically from the Almadenejos zone, are highly contaminated, with some zones having values above 4,000 渭g Hg g^鈥? soil. Although soils have an extremely high concentration of mercury, generally less than 2% is available for plants, as is shown by various soil extractions simulating bioavailability. In plants, Hg concentration increases depending on the content of Hg in soils. In addition, Hg levels in roots are higher than in aerial parts, which is a strategy of plants for protecting their more sensitive aerial parts from the deleterious effects of metal stress. The total content of phytochelatins (PCs) and their complexes are directly related with the amount of mercury in soils. These findings highlight the important role of thiol compounds and their metal complexes in capturing and fixing Hg from soils, giving plants the capacity to deal with the heavy metal toxicity of polluted soils.