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Nasturtium officinale  is a cadmium (Cd) accumulator plant, but its phytoremediation capacity is low compared to other hyperaccumulators. To improve the phytoremediation capacity, the seedlings of  N. officinale  was grown in Cd-contaminated paddy soils, and the effects of diethyl aminoethyl hexanoate (DA-6) on  N. officinale  growth and Cd accumulation were studied. DA-6 increased the shoot biomass of  N. officinale , and had a quadratic polynomial regression relationship with root and shoot biomass. DA-6 had no significant effects on chlorophyll  a , chlorophyll  b , and carotenoid contents, increased peroxidase, superoxide dismutase, and catalase activities, and decreased the soluble protein content. DA-6 also increased the Cd content and Cd extraction of  N. officinale  to some extent, and had a quadratic polynomial regression relationship with the root Cd content, shoot Cd content, root Cd extraction, and shoot Cd extraction. Significant correlations were found among plant biomass, chlorophyll content, Cd content, Cd extraction, and antioxidant enzyme activity. Furthermore, soluble protein content and soil exchangeable Cd was significantly correlated with plant Cd content and Cd extraction. Therefore, DA-6 can promote  N. officinale  growth and improve its phytoremediation capacity for Cd-contaminated paddy soils, with a recommend optimum dose of 20 mg/L.

chemistry and ecology

Diethyl aminoethyl hexanoate improves the phytoremediation capacity of the accumulator plant  Nasturtium officinale  for cadmium contaminated paddy soils