Journal of Food, Agriculture and Environment

The radio-protective role of gibberellic acid on nucleic acid metabolism in three species of senna

Author(s):

Muna M. Al-Rumaih

Recieved Date: 2007-05-13, Accepted Date: 2007-08-22

Abstract:

The response of three species of senna, namely Cassia occidentalis, Cassia senna and Cassia italica, to gamma (γ) irradiation treatment (0, 20, 40, 60, 80 krad) and to gibberellic acid (GA₃) post-treatment (20 ppm) was investigated with respect to nucleic acid metabolism. Gamma irradiation induced a significant decrease in the level of nucleic acids (DNA and RNA) accompanied by a corresponding induction of hydrolytic activities of DNase and RNase in the developed seedlings in comparison with un-irradiated control. Those changes were more significant at higher γ-ray doses. Post-treatment of irradiated seeds with GA₃ partially alleviated the adverse effects of radiation. It significantly increased nucleic acid levels and repressed the activities of DNase and RNase. The protective role played by GA₃ was more significant at lower γ-ray doses. The three investigated species expressed a differential response to γ-irradiation and to GA₃ post-treatment. The detrimental effects of irradiation on nucleic acid metabolism and the ability of GA₃ in counteracting the adverse effects of irradiation are discussed.

Keywords:

Nucleic acids, DNase, RNase, stress, gibberellic acid, irradiation, DNA, RNA, gamma irradiation

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Journal: Journal of Food, Agriculture and Environment
Year: 2007
Volume: 5
Issue: 3&4
Category: Environment
Pages: 359-362

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