Submit Manuscript

American Journal of Plant Physiology

Year: 2011 | Volume: 6 | Issue: 6 | Page No.: 294-303
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Article Trend

Total views 496

Search

Authors

Nasraoui-Hajjaji Afef

Saafi Leila

Bouthour Donia

Gouia Houda

Chaffei-Haouari Chiraz

Keywords

Cadmium (Cd) is a non-essential heavy metal that does not have any metabolic use. In this study the impacts of Cd added in nutrient solution on growth, physiology and carbon metabolism of tobacco (Nicotiana rustica) were investigated. Tobacco plants were grown in media containing CdCl2 at 0, 10, 20, 50 or 100 μM for 30 days. Regarding leaves, Dry Weight (DW) and leaf surface area were negatively affected by Cd. Soluble sugar content was decreased parallel with a reduce of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBP) activity. The reduction in RuBP activity was accompanied by a decrease in Rubisco subunit amounts. These changes came with a dramatic loss in photosynthetic pigments. In another way, Cd stress enhanced the activities of phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) and NADP-isocitrate dehydrogenase (NADP-ICDH, EC 1.1.1.42) in tobacco leaves. This study suggested that readjustment of the C metabolism via modulation of Krebs cycle enzymes activities and C flow towards the amino acid biosynthesis were a strategy of tobacco plants to tolerate Cd stress.
PDF Fulltext XML References Citation

Related Articles

Effect of Cadmium on Abundance and Diversity of Free Living Nitrogen Fixing Azotobacter spp.
Elevated CO2 and Stress Tolerance in Crop Plants with Particular Reference to Agro-climatic Conditions of Pakistan
The Inhibition of Bean Plant Metabolism by Cd Metal and Atrazine: I. The Effect of Atrazine with Cd Metal on Growth, Photosynthesis, Nutritional Level and Rhizosphere of Soil
Differential Toxicological Response to Cadmium Stress of Bean Seedlings Grown With NO3– or NH4+ as Nitrogen Source
Changes in Activities of Nitrogen Metabolism Enzymes in Cadmium Stressed Marrow Seedlings
Analysis of Cadmium-peptide Complexes in Sunflower (Helianthus annuus L.) Roots as Detected by Gel-filtration Chromatography

Leave a Comment

Your email address will not be published. Required fields are marked *