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The aim of this study was to determine the effects of spraying an algal biostimulant at different concentrations (0, 600-, 900-, 1200-, and 1500-fold dilutions) on the growth and cadmium (Cd) accumulation characteristics of accumulator plant  Nasturtium officinale . In a pot experiment, application of the algal biostimulant at all concentrations promoted the growth of  N. officinale  by increasing the root and shoot biomasses, and the 600-fold dilution of the algal biostimulant had the strongest effect. At all concentrations, the algal biostimulant had no significant effect on the Cd content in roots of  N. officinale , and increased the Cd extraction by roots. However, all concentrations of the algal biostimulant except for the 1500-fold dilution decreased the Cd content in shoots and Cd extraction by shoots. The  N. officinale  plants treated with the 600-fold dilution of the algal biostimulant had the lowest shoot Cd contents and Cd extraction by shoots. The algal biostimulant also increased the contents of photosynthetic pigments (chlorophyll  a , total chlorophyll, and carotenoids) in leaves of  N. officinale  to varying degrees. Different concentrations of algal biostimulant reduced the superoxide dismutase activity, peroxidase activity, and malondialdehyde content of  N. officinale , but enhanced the catalase activity, soluble protein content, and relative conductivity. Overall, the 600-fold dilution had the strongest effect on the growth and Cd accumulation characteristics of  N. officinale , but did not enhance the phytoremediation ability of  N. officinale  for growth in Cd-contaminated soil. These results show that this algal biostimulant can promote the growth and reduce the Cd uptake of  N. officinale , which is benefit for  N. officinale  safety production as a wild vegetable in Cd-contaminated soils.

An algal biostimulant promotes growth and decreases cadmium uptake in accumulator plant Nasturtium officinale