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Ammonium Alleviates Redox State in <em>Solanum</em> Seedlings under Cadmium Stress Conditions | OMICS International | Abstract
ISSN: 2161-0525

Journal of Environmental & Analytical Toxicology
Open Access

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Research Article

Ammonium Alleviates Redox State in Solanum Seedlings under Cadmium Stress Conditions

Afef Nasraoui-Hajaji1*, Houda Gouia1, Elisa Carrayol2 and Chiraz Haouari-Chaffei1
1Unité de Recherche, Nutrition et Métabolisme Azotés et Protéines de Stress, Université de Tunis El-Manar, Faculté des sciences de Tunis, Département de Biologie, Campus universitaire, 1060 Tunis, Tunisie
2Unité de nutrition azotée des plantes, INRA, route de Saint-Cyr, F-78027 Versailles, France
Corresponding Author : Afef Nasraoui-Hajaji
Unité de Recherche
Nutrition et Métabolisme Azotés et Protéines de Stress
Université de Tunis El-Manar, Faculté des sciences de Tunis
Département de Biologie, Campus
E-mail: [email protected]
Received April 20, 2012; Accepted May 10, 2012; Published May 12, 2012
Citation: Nasraoui-Hajaji A, Gouia H, Carrayol E, Haouari-Chaffei C (2012) Ammonium Alleviates Redox State in Solanum Seedlings under Cadmium Stress Conditions. J Environ Anal Toxicol 2:141. doi: 10.4172/2161-0525.1000141
Copyright: © 2012 Nasraoui-Hajaji A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Cadmium effects on growth and oxidative stress were investigated in 21-day-old tomato seedlings (Solanum) grown in hydroponics media containing 5 mM of KNO3 or (NH4)2SO4 and three Cd levels as CdCl2 (0, 5 and 25 μM) for 14 d. Cadmium was more accumulated in nitrate-fed tomato compared to ammonium-fed ones. Dry weight, Chla, Chlb and carotenoides contents were reduced in NO3--fed tomato. But in NH4 +-fed plants the parameters were increased. Cadmium induced an increase in the H2O2 and MDA levels which was more pronounced in nitrate-fed tomato. Antioxidant enzyme activities such as superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase(APX) were induced with Cd. But, the enhancement degree of these enzymes activities were higher in ammonium-fed tomato compared to those grown with nitrate. These data suggested that antioxidative activity developed by tomato leaves is more induced by cadmium when ammonium was added in nutrient solution as nitrogen source. This can be related to the ability of cadmium to induce an accumulation of reactive oxygen species (ROS) less pronounced in presence of ammonium regime. The beneficial effect of NH4+ on Cd toxicity was confirmed by a significant decrease in MDA level and accumulation of photosynthetic pigments.

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