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Publication Date: 21 Jan 2010
Journal: International Journal of Insect Science 2009:1 29-44
Abstract Scirpophaga incertulas Walker (Lepidoptera: Pyralideae), commonly known as yellow stem borer, is a predominant monophagous pest of rice, which causes 5% to 30% loss of the rice crop. We report for the first time, the cloning and sequence analysis of the amylase gene of this pest. The cloned gene translates into a protein of 487 amino acids having a predicted molecular weight of 54,955 daltons and a theoretical pI of 5.9. The 3D structure of the amylase is predicted from its amino acid sequence by homology modeling using the structure of the amylase from Tenebrio molitor L (Coleoptera: Tenebrionidae). We also report the purification of a dimeric α-amylase inhibitor from a local variety of wheat MP Sehore that is specific for the amylase of this pest and does not inhibit human salivary amylase or porcine pancreatic amylase. The gene encoding this inhibitor has been cloned and its sequence has been analysed to find a possible explanation for this specificity.
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