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Effect of cadmium on growth and ∂-aminolevulinic acid dehydratase and acid phosphatase activities of tobacco seedlings

Author: 
Chiraz Chaffei Haouari, Afef Hajjaji Nasraoui, Tarak Makhlouf, Donia Bouthour, Elisa Carrayol and Houda Gouia
Subject Area: 
Health Sciences
Abstract: 

Nicotiana tabaccum var. souffi seedlings were grown under different cadmium (Cd) concentrations (0, 10, 20, 50 and 100 μM) in a hydroponic system during 7 d. Plant growth, micronutrient, chlorophyll and carotenoid concentrations, as well as δ-aminolevulinic acid dehydratase (ALA-D; E.C.4.2.1.24) and acid phosphatase (AP; E.C.3.1.3.2) activities were then analysed. Cadmium concentration in both shoots and roots increased with increasing external Cd levels. Metal concentration was on average7-fold greater in root than in shoot tissues. Root length was unaffected by Cd treatments. In contrast, dry weight of both shoot and roots decreased significantly with 100 µM of Cd. A micronutrient- and organ-dependent response to Cd toxicity was observed. Zinc and Cu concentrations in both shoot and roots did not alter upon treatment with Cd. Cadmium stress reduced Mn uptake but not its translocation within the plant. A synergistic effect of Cd on Fe concentration in root at 10 μM and 100 μM Cd levels was observed. The activity of AP, and especially that of ALA-D, was reduced with increasing Cd levels. At those these Cd levels, chlorophyll concentration was also reduced. There was a positive correlation between concentrations of carotenoids and chlorophylls. Our results indicate that N. tabaccum seems to have some degree of Cd tolerance.

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