International Research Journal of Agricultural Science and Soil Science

International Research Journal of Agricultural Science and Soil Science (ISSN: 2251-0044) Vol. 3(12) pp. 408-415, December 2013. DOI: http:/dx.doi.org/10.14303/irjas.2013.127. Copyright © 2013 International Research Journals

 

Full Length Research Paper

Effect of Gamma Irradiation or Potassium on Some Primary and Secondary Metabolites of Brassica rapa (L.) Root Under Cadmium Stress

Shaimaa Abd El-Hameed Abo-Hamad, Khalil Mahfouz Ghareeb Saad -Allah, Essam El-Deen Mohammed Abo-Kassem

Botany Department, Faculty of Science, Tanta University, Tanta, Egypt

Received November 14, 2013; Accepted December 18, 2013

Abstract

 

The effect of cadmium chloride concentrations (25 50 75 and 100 mg/kg soil), seeds pre-irradiated by low doses of gamma rays (15 30 45 and 60 Gy), potassium chloride (60 mg/kg soil) and the combination of cadmium with gamma and cadmium with potassium on Brassica rapa primary and secondary metabolites at different growth stages were investigated. It was found that, combination of low doses of gamma or potassium with cadmium significantly increased the root soluble protein content at the various growth stages compared with the content of plants singly treated with cadmium. Proline, alkaloids and phenolic compounds were accumulated in roots in response to cadmium compared with the control and their accumulation was magnified by gamma irradiation. This suggested an important role for these compounds in plant response to cadmium pollution.

Keywords: Brassica rapa, cadmium chloride, gamma irradiation, potassium, proteins, proline, alkaloids and phenolics. 

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