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The seeds of ten genotypes and twenty-nine wild relatives of okra were analysed for the presence of trypsin, chymotrypsin, and  Helicoverpa  gut proteinases (HGPs) inhibitors (HGPIs), with the aim to identify potent inhibitors of  H. armigera  gut proteinases. Proteinase inhibitors (PIs) obtained from wild relatives of okra exhibited stronger inhibition of HGPs than the genotypes of okra. In  in vitro  inhibitory assay against HGPs,  A. tuberculatus  90396 and 90515 showed high tryptic inhibitory (71.8% and 69.2%), chymotryptic inhibitory (68.5% and 66.2%), and  Helicoverpa  gut proteinase activity (70.2% and 68.2%). In electrophoretic profile showed the same variation in the number of trypsin inhibitors (TIs), chymotrypsin Inhibitors (CIs), and HGPIs isoforms with different intensities, whereas genotypes of okra mostly showed monomorphic profile. Maximum eight HGPIs isoforms were found in  A. tuberculatus  (90396 and 90515). In bioassay studies, significant reduction in weight of  H. armigera  larvae was found, when larvae fed on PIs obtained from  A. tuberculatus  (90396 and 90515). Thus, the result of the present investigation indicates that further exploration of PIs obtained from  A. tuberculatus  (90396 and 90515) will be helpful for developing PIs-based insect resistance management strategies.

Differential Inhibition of Helicoverpa armigera (Hubner) Gut Proteinases by Proteinase Inhibitors of Okra and It's Wild Relatives