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Changes in growth and antioxidant enzymes activities during cadmium stress in the mangrove plant Kandelia candel (L.) Druce

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Author(s): Mohammed M. Rahman | M. Motiur Rahman | Yan Chongling | Kazi S. Islam

Journal: Advances in Environmental Sciences
ISSN 2066-7620

Volume: 2;
Issue: 1;
Start page: 15;
Date: 2010;
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Keywords: cadmium stress | growth | antioxidative enzymes | Kandelia candel

ABSTRACT
Changes in growth and antioxidant enzymes activities during cadmium (Cd) stress in Kandeliacandel (L.) Druce seedlings were investigated. The seedlings were grown in green house condition forthree months in nutrient solution with 0, 1, 5, 10, 15, 20, 25 ppm CdCl2. Growth parameters, guaiacolperoxidase (POD), superoxide dismutase (SOD) and catalase (CAT), activities were analyzed in leavesand roots collected after three month exposure. This study demonstrates that under high concentrationof Cd stress, the total biomass, the average seedlings stem height and leaf number of the K. candeldecreased by 41.57%, 30.54% and 42.68%, respectively compare to control (CK). The activity ofantioxidant enzymes POD, SOD and CAT in leaves were significant increase, this was noticed especiallyat the lower concentration. In root, this effect was more evident and they responded to low Cdstimulation more rapidly. However at the highest concentration of Cd exposure, the activity of POD, SODand CAT were decreased both in leaf and root. The reductions in the activities of antioxidative enzymesin K. candel at the high concentration of Cd treatments indicate that Cd tolerance characteristics of thisplant cannot be attributed to antioxidative defense. This result indicated that the higher concentration ofCd might affect the antioxidant enzyme system of K. candel. That may be inhibited the plant growth andbiomass.
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