CADMIUM-INDUCED OXIDATIVE STRESS .AND GROWTH RETARDATION IN CANOLA (BRASSICA NAPIIS L.) SEEDLING

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OLOOMI H.; M-KALANTARI KH.

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Paper Information

Journal: IRANIAN JOURNAL OF BIOLOGY Year:2002 | Volume:12 | Issue:1-2 Page(s): 52-62

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Title

CADMIUM-INDUCED OXIDATIVE STRESS .AND GROWTH RETARDATION IN CANOLA (BRASSICA NAPIIS L.) SEEDLING

Author(s)

OLOOMI H. | M-KALANTARI KH. | Issue Writer Certificate

Keywords

CADMIUM TOXICITY: BRASSICA NAPLLSQ3

OXIDATIVE STRESS: ASCORBATE: DEHYDROASCORBATE: CHLOROPHYLL CONTENTQ4

Abstract

In the persence of heavy metals in soils, plants responses are various. Cadmium as a heavy metal induced seriour symptoms in plants such as growth retardation, root damahes, alternation in plasma membrane properties, changing enzyme activities and the amount of antioxidant compounds. In this study the effects of various concentrations of cadmium chloride on growth parameters and physiological processes of canola seedlings were investigated. Seeds were germinated-on filter paper in Petri dishes containing various concentration of Cd2+. After a week identical seedlings selected and then analyzed. The obtained results show significant decrease in root growth, root elongation and total chlorophyll contents, especially in higher cadmium ion concentration. It seems that chlorophyll decreasing could be from direct effect of cadmium ions on chlorophyll synthesis. Cd2+ absorption by root and Cd2+transport in xylem and its accumulation in leaves caused significant increased lipid peroxidation in root and leaf. It happened because of high susceptibility of double bounds of lipids in memberane ehich is reactive to oxygen species (ROS) and increasing activeity of peroxidase. The seedlings sublected to high level 06 Cd2-showed decrease in ascorbate (ASe) / dehydroascorbate (DHA) ratio while total ascorbate concentration did not show remarkable changes in comparison to controls. The results suggested that growth retadation is because of direct effect of cadmium ion on cell growth and cell division. This is because of high tedency of cadmium ion to solfhydry groups or the indirect effect of cadmium ion via reactive oxygen species (ROS) formation. Red-brown coloration of merlstemic and elongation zone could possibly be the increase activation of peroxidase enzymes. In the other hand, it seems that growth retardation may caused because of impaired ascorbate - glutathion .cycle activity in high cadmium concentation . Decrease in ascorbate content is caused from glu tathion (GSH) impotring to GSH pool for phytochelation synthesis and decreased ascorbate as reduction substrate. However, synthesis of ascorbate, ascorbate peroxidase, monodehydroascorbate reductase and glutathion reductase is stimulated in lower concentration of cadmium ion which inceases in GSH cycle activity and detoxification of ROS.

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APA: Copy

OLOOMI, H., & M-KALANTARI, KH.. (2002). CADMIUM-INDUCED OXIDATIVE STRESS .AND GROWTH RETARDATION IN CANOLA (BRASSICA NAPIIS L.) SEEDLING. IRANIAN JOURNAL OF BIOLOGY, 12(1-2), 52-62. SID. https://sid.ir/paper/21176/en

Vancouver: Copy

OLOOMI H., M-KALANTARI KH.. CADMIUM-INDUCED OXIDATIVE STRESS .AND GROWTH RETARDATION IN CANOLA (BRASSICA NAPIIS L.) SEEDLING. IRANIAN JOURNAL OF BIOLOGY[Internet]. 2002;12(1-2):52-62. Available from: https://sid.ir/paper/21176/en

IEEE: Copy

H. OLOOMI, and KH. M-KALANTARI, “CADMIUM-INDUCED OXIDATIVE STRESS .AND GROWTH RETARDATION IN CANOLA (BRASSICA NAPIIS L.) SEEDLING,” IRANIAN JOURNAL OF BIOLOGY, vol. 12, no. 1-2, pp. 52–62, 2002, [Online]. Available: https://sid.ir/paper/21176/en

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