Arsenic toxicity in Acacia mangium willd. and mimosa Caesalpiniaefolia benth. seedlings

Revista Brasileira de Ciência do Solo

Henrique Nery Cipriani²  Luiz Eduardo Dias¹  Maurício Dutra Costa¹  Naiara Viana Campos¹  Aristéa Alves Azevedo¹  Roberto Junio Gomes¹  Izabela Ferreira Fialho¹  Sandra Patrícia Montealegre Amezquita¹ 

[1] ,Embrapa RondôniaPorto Velho RO ,Brazil

关键词: arsenate;    heavy metals;    phytoremediation;    root anatomy;    soil contamination;    anatomia radicular;    arsenato;    contaminação do solo;    fitorremediação;    metais pesados;   

DOI  :  10.1590/S0100-06832013000500031

来源: SciELO

【 摘 要 】

Acacia mangium and Mimosa caesalpiniaefolia are fast-growing woody fabaceous species that might be suitable for phytoremediation of arsenic (As)-contaminated sites. To date, few studies on their tolerance to As toxicity have been published. Therefore, this study assessed As toxicity symptoms in A. mangium and M. caesalpiniaefolia seedlings under As stress in a greenhouse. Seedlings of Acacia mangium and M. caesalpiniaefolia were grown for 120 d in an Oxisol-sand mixture with 0, 50, 100, 200, and 400 mg kg-1 As, in four replications in four randomized blocks. The plants were assessed for visible toxicity symptoms, dry matter production, shoot/root ratio, root anatomy and As uptake. Analyses of variance and regression showed that the growth of A. mangium and M. caesalpiniaefolia was severely hindered by As, with a reduction in dry matter production of more than 80 % at the highest As rate. The root/shoot ratio increased with increasing As rates. At a rate of 400 mg kg-1 As, whitish chlorosis appeared on Mimosa caesalpiniaefolia seedlings. The root anatomy of both species was altered, resulting in cell collapse, death of root buds and accumulation of phenolic compounds. Arsenic concentration was several times greater in roots than in shoots, with more than 150 and 350 mg kg-1 in M. caesalpiniaefolia and A. mangium roots, respectively. These species could be suitable for phytostabilization of As-contaminated sites, but growth-stimulating measures should be used.

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