ORIGINAL ARTICLE

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Antioxidative responses and expression of insecticidal proteins in Bt cotton under high irradiance

Parimala P., Muthuchelian K.*

Department of Bioenergy, School of Energy, Environment and Natural resources, Madurai Kamaraj University, Madurai, INDIA.

*E-Mail: drchelian1960@yahoo.co.in

Fax: +91 452-2459181 Telephone: +91 452 2458020

Received July 7, 2011

Effect of high irradiance (HI) on the activity of antioxidant enzymes, rate of lipid peroxidation and hydrogen peroxide accumulation were investigated in non Bt and Bt cotton. The accumulation of malondialdehyde (MDA) and H₂O₂ was higher in Bt cotton. Sustained cultivation of Bt cotton requires stable transgene expression under HI stress. In the present study, Bt toxin proteins (Cry1Ac and Cry2Ab), which are essential for the control of lepidopteron pests, were found to be reduced in Bt cotton under HI stress.

Key words: antioxidant enzymes, Bt cotton, high irradiance, insecticidal protein expression