Abstract
The response of three species of Trigonella, namely, Trigonella stellata, Trigonella hamosa and Trigonella anguina to gamma irradiation stress was investigated with respect to antioxidant enzyme induction. When dry seeds were subjected to gamma rays (0, 40, 60, 80, 100 Krad) from a cobalt source 60Co at a dose rate of 233.5 rad/ min, a dose dependent increase in the activities of ascorbate peroxidase (APOX), superoxide dismutase (SOD) and glutathione reductase (GR) was observed in both shoots and roots of the studied species. On the contrary, catalase activity was repressed, particularly at the higher applied doses. Shoots were more significantly affected by irradiation than roots. The three species differed in their radio-sensitivity with respect to the characters concerned. Changes in the activity of the key antioxidant enzymes which confer tolerance to irradiation stress were discussed.
Highlights
Electron donors and utilize H2O2 in the oxidation of various inorganic and organic substrates [8]
The role of Plants often face the challenge of several environmental conditions which include such stressors as drought, salinity, pesticides, low temperature and irradiation, all of which exert adverse effects on plant growth and development [1]
There was a compelling evidence which show that the activities of enzymes involved in active oxygen species (AOS) scavenging were altered by several of reactive oxygen species (ROS) such as superoxide environmental stresses, including gamma irradiation
Summary
Electron donors and utilize H2O2 in the oxidation of various inorganic and organic substrates [8]. Plants have evolved various protective mechanisms to counteract the effects of reactive oxygen species in cellular compartments [4]. The species selected for the present study Trigonella stellata, Trigonella hamosa and Trigonella anguina were annual herbs which belong to the family Leguminosae Several reports revealed their wide distribution in the Kingdom of Saudi Arabia[16], and others considered them as medicinal plants and forage crops [17]. An attempt had been made to elucidate the irradiation induced changes in the activities of ascorbate peroxidase, superoxidase dismutase, glutathione reductase and catalase, the enzymes involved in oxidative stress defense in three species of Trigonella
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