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Differential induction of superoxide dismutase in downy mildew-resistant and -susceptible genotypes of pearl millet


Differential induction of superoxide dismutase in downy mildew-resistant and -susceptible genotypes of pearl millet



Plant Pathology 51(4): 480-486



ISSN/ISBN: 0032-0862

DOI: 10.1046/j.1365-3059.2002.00733.x

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. Reprinted by permission of the publisher.

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Accession: 003713618

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