Changes in growth and antioxidant enzymes activities during cadmium stress in the mangrove plant Kandelia candel (L.) Druce.
Journal Title: Advances in Environmental Sciences - International Journal of the Bioflux Society - Year 2010, Vol 2, Issue 1
Abstract
Changes in growth and antioxidant enzymes activities during cadmium (Cd) stress in Kandelia candel (L.) Druce seedlings were investigated. The eedlings were grown in green house condition for three months in nutrient solution with 0, 1, 5, 10, 15, 20, 25 ppm CdCl2. Growth parameters, guaiacol peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT), activities were analyzed in leaves and roots collected after three month exposure. This study demonstrates that under high concentration of Cd stress, the total iomass, the average seedlings stem height and leaf number of the K. candel decreased by 41.57%, 30.54% and 42.68%, respectively compare to control (CK). The activity of antioxidant enzymes POD, SOD and CAT in leaves were significant increase, this was noticed especially at the lower concentration. In root, this effect was more evident and they responded to low Cd stimulation more rapidly. However at the highest concentration of Cd exposure, the activity of POD, SOD and CAT were decreased both in leaf and root. The reductions in the activities of antioxidative enzymes in K. candel at the high concentration of Cd treatments indicate that Cd tolerance characteristics of this plant cannot be attributed to antioxidative defense. This result indicated that the higher concentration of Cd might affect the antioxidant enzyme system of K. candel. That may be inhibited the plant growth and biomass.
Authors and Affiliations
Mohammed Rahman, Md. Rahman, Yan Chongling, Kazi Islam
Keywords
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