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The influence of succinate treatment on Zn toxicity was investigated using plant growth and mineral uptake as stress indicators. Pea plants (Pisum sativum L., cv. Citrine) were treated with various Zn concentrations (0.67 to 700 muM Zn) in the presence and absence of 0.2 mM Na-succinate. Plants pre-treated with succinate and then exposed to Zn exhibited higher dry root, stem and leaf weight than the plants treated with Zn alone. An increase in Zn supply resulted in a decrease in the concentrations of Ca, Mg, P in the roots and an increase of Ca and N levels in the stems and leaves. The amount of Zn in the roots, stems and leaves increased with greater Zn rates. The succinate treatment increased P in the roots but did not affect the Ca, N and Mg contents in Zn-treated plants. Most of the Zn taken up was retained in the roots after succinate treatment. The ameliorative effect of succinate on plant growth could be due to a lower Zn translocation in the leaves and stems and increased Zn accumulation in the roots. Lower Zn translocation in aboveground parts seemed to result from Zn complexing by organic anion in the roots. This probably caused less Zn transport to the stems and leaves and suggested that succinate has potential for complexing with Zn and may play a role in tolerance to high Zn levels. A influência do ácido succínico na toxicidade de Zn foi estudada, tendo-se o crescimento das plantas e a absorção mineral como parâmetros indicadores de estresse. Plantas de ervilha (Pisum sativum L., cv. Citrine) foram tratadas com várias concentrações de Zn (0,67 a 700 miM) na presença ou ausência de 0,2 mM de succinato de sódio. Plantas pré tratadas com succinato e então expostas ao Zn apresentaram maior massa seca de raízes, caules e folhas que plantas apenas tratadas com Zn. Aumento no fornecimento de Zn resultou em decréscimo nas concentrações de Ca, Mg, P nas raízes, mas aumento de Ca e N levels nos caules e folhas. A quantidade de Zn nas raízes, caules e folhas aumentou com o aumento do suprimento de Zn. O tratamento com succinato levou ao aumento P nas raízes e não afetou os conteúdos de Ca, N, Mg nas plantas tratadas com Zn. A maior parte do Zn absorvido ficou retido nas raízes depois do tratamento com o succinato. A melhora causada pelo succinato no crescimento das plantas talvez tenha sido devido ao acúmulo de Zn nas raízes, em função da maior complexação pelo íon orgânico, havendo menor translocação para as folhas e caules

The effect of zinc supply and succinate treatment on plant growth and mineral uptake in pea plant