biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 51:157-160, 2007 | DOI: 10.1007/s10535-007-0030-z

Increased antioxidant activity in Cassia seedlings under UV-B radiation

S. Agarwal1
1 Stress Physiology Laboratory, Department of Botany, JNV University, Jodhpur, Rajasthan, India

Cassia auriculata L. seedlings were irradiated with ultraviolet B (UV-B) in an environment-control chamber. The two doses assayed (7.5 and 15.0 kJ m-2) induced oxidative damage with an increase in lipid peroxidation and hydrogen peroxide and a decrease in chlorophyll and total phenol contents. The ascorbate and dehydroascorbate content as well as the reduced glutathione/oxidized glutathione content and ratio were significantly increased. The UV-B stress led to significant increases of the activity of superoxide dismutase, catalase, peroxidase and polyphenol oxidase. It is suggested that Cassia seedlings try to counteract high concentrations of oxygen species produced under UV-B stress through a co-ordinated increase in the contents and activities of antioxidants involved in their detoxification.

Keywords: ascorbate; catalase; glutathione; hydrogen peroxide; oxidative stress; peroxidase; phenol; polyphenol oxidase; superoxide dismutase; thiobarbituric acid reactive substances
Subjects: antioxidants, antioxidant enzymes; ascorbate peroxidase; Cassia angustifolia; catalase; glutamic acid, glutathione; peroxidase; phenolics; polyphenol oxidase; reactive oxygen species (ROS); superoxide dismutase (SOD); thiobarbiturate acid; UV radiation, stress

Received: April 19, 2005; Accepted: November 1, 2005; Published: March 1, 2007  Show citation

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Agarwal, S. (2007). Increased antioxidant activity in Cassia seedlings under UV-B radiation. Biologia plantarum, 51(1), 157-160. doi: 10.1007/s10535-007-0030-z
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