Differential induction of superoxide dismutase in downy mildew-resistant and -susceptible genotypes of pearl millet |
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| Authors: | M P Babitha S G Bhat H S Prakash † H S Shetty |
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| Institution: | Downy Mildew Research Laboratory, Department of Applied Botany and Biotechnology, University of Mysore, Mysore-570 006;and;Department of Biochemistry and Nutrition, Central Food Technological Research Institute, Mysore-570 013, Karnataka, India |
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| Abstract: | Differential induction of superoxide dismutase (SOD) in downy mildew-resistant and -susceptible genotypes of pearl millet ( Pennisetum glaucum ) was observed on inoculation with Sclerospora graminicola . SOD activity was studied in resistant (IP18292) and susceptible (23B) pearl millet seedlings inoculated with S. graminicola . SOD activity increased by 2·3-fold in resistant seedlings upon inoculation. SOD activity was greatest in roots, with a specific activity of 3182 U per mg protein, after inoculation. SOD activity increased in all the resistant genotypes upon inoculation with S. graminicola . Native PAGE analysis showed four isozymes of SOD, three of which (SOD-1, -2 and -4) were Cu/Zn-SOD, whereas isozyme SOD-3 was Mn-SOD. This study also revealed increased intensity of all four isozymes of SOD in the resistant genotype upon inoculation. The involvement of SOD in pearl millet (host)–downy mildew pathogen interaction is discussed. |
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| Keywords: | downy mildew host–pathogen interaction isozymes pearl millet Sclerospora graminicola superoxide dismutase |
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