African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Response of growth and antioxidant system of heavy metal-contaminated tomato plants to 24-epibrassinolide

Mostafa M. Rady1* and Ashraf Sh. Osman2
1Department of Agricultural Botany, Faculty of Agriculture, Fayoum University, 63514-Fayoum, Egypt. 2Department of Horticulture, Faculty of Agriculture, Fayoum University, 63514-Fayoum, Egypt.
Email: [email protected]

  •  Accepted: 10 May 2012
  •  Published: 05 June 2012

Abstract

The plants of tomato (Lycopersicon esculentum Mill.) were grown in the presence of cadmium or lead (100 to 200 μM Cd2+ or Pb2+) and sprayed with 2 μM of 24-epibrassinolide (EBL), and were sampled at 4 weeks after transplanting. The plants exposed to Cd2+ or Pb2+ exhibited an increase in the activity of antioxidant enzymes (superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase) and the level of total ascorbate and reduced glutathione. However, EBL treatment further induced the enzymatic and non-enzymatic system in tomato plants treated with heavy metals. This positive effect was reflected in the improvement of plant growth in the presence of Cd2+ or Pb2+. EBL plays an important role in plant responding to heavy metal stress, demonstrating an anti-stress effect on tomato plants contaminated by heavy metals.

 

Key words: 24-Epibrassinolide, heavy metals, growth, antioxidant system.