African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 718

Full Length Research Paper

Response of tomato (Solanum lycopersicon) to cadmium toxicity: Growth, element uptake, chlorophyll content and photosynthesis rate

Chiraz Chaffei Haouari*, Afef Hajjaji Nasraoui, Donia Bouthour, Maaroufi Dghimi Houda, Chiraz Ben Daieb, Jamel Mnai and Houda Gouia        
Research Unit, Nutrition and nitrogen metabolism and stress protein (99UR/09-20),Department of Biology, Faculty of Sciences of Tunis, Campus Universitaire El Manar I,1060, Tunis-Tunisia.
Email: [email protected]

  •  Accepted: 21 October 2011
  •  Published: 06 January 2012

Abstract

The effect of cadmium (Cd) accumulation on mineral composition in roots and shoots, growth development, chlorophyll and water content of tomato (Solanum lycopersiconMill 63/5F1) seedlings was tested under doses of 0 (control), 10, 50 and 100 µM. Cadmium accumulation was defined by elevated concentrations as 50 to 100 µM in root and shoot tissues. Element uptake by roots and shoot was negatively affected by raise in cadmium concentrations, especially in 100 µM Cd. Root and shoot elongation, root and shoot fresh and dry biomass, leaf area were negatively affected by increasing Cd concentrations. Tissue water content, growth tolerance index, chlorophyll a, chlorophyll b and total chlorophyll content were limited by cadmium toxicity. The addition of Cd in the growth medium also had significant deleterious effect on net photosynthetic rate (Pn) and intracellular CO2 concentration (Ci), with Pn being reduced by 27.2 and 62.1% at 5 μmol/L and 100 µM Cd treatments compared to the control, respectively, while Ciincreased correspondingly by 28.4 and 39.3%.

 

Key words: Cadmium (Cd), toxicity, growth, nutrient, chlorophyll, photosynthesis.