Biomolecules involved in resistance against Chilo partellus (Swinhoe) in Sorghum bicolor L.

Luthra, Y. P. and Joshi, U. N. and Singh, S. P. (2009) Biomolecules involved in resistance against Chilo partellus (Swinhoe) in Sorghum bicolor L. Acta Phytopathologica et Entomologica Hungarica, 44 (1). pp. 201-209. ISSN 0238-1249

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Abstract

The phenolic profile and specific activity of oxidative enzymes in sorghum leaves and stem resistant and susceptible to Chilo partellus (Swinhoe) were analyzed at 45 and 60 days after germination. Resistant varieties had higher content of total phenols, o-dihydric phenols, flavanols and tannins than the susceptible varieties at both the stages of plant growth and the concentration of these biomolecules increased after infestation as well as with plant age in both sets of varieties. Moreover, resistant varieties exhibited higher specific activity of polyphenol oxidase, peroxidase, phenylalanine ammonia-lyase and tyrosine ammonia-lyase in their leaves and stem in comparison to the corresponding activities in susceptible ones. Peroxidase activity was several folds than the polyphenol oxidase. Healthy leaves of susceptible varieties showed higher catalase activity in comparison with resistant ones at day 45 and this trend was reversed at day 60. Role of phenolic compounds and oxidative enzymes particularly the peroxidase in determining resistance against stem borer has been high lighted.

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