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Helicoverpa armigera  is one of the major devastating pests of crop plants. In this context a serine peptidase inhibitor purified from the seeds of  Butea monosperma  was evaluated for its effect on developmental physiology of  H. armigera  larvae.  B. monosperma  peptidase inhibitor on 12% denaturing polyacrylamide gel electrophoresis exhibited a single protein band of ~14 kDa with or without reduction.  In vitro  studies towards total gut proteolytic enzymes of  H. armigera  and bovine trypsin indicated measurable inhibitory activity.  B. monosperma  peptidase inhibitor dose for 50% mortality and weight reduction by 50% were 0.5% w/w and 0.10% w/w, respectively. The IC 50  of  B. monosperma  peptidase inhibitor against total  H. armigera  gut proteinases activity was 2.0 µg/mL. The larval feeding assays suggested  B. monosperma  peptidase inhibitor to be toxic as reflected by its retarded growth and development, consequently affecting fertility and fecundity of pest and prolonging the larval-pupal duration of the insect life cycle of  H. armigera . Supplementing  B. monosperma  peptidase inhibitor in artificial diet at 0.1% w/w, both the efficiencies of conversion of ingested as well as digested food were downregulated, whereas approximate digestibility and metabolic cost were enhanced. The efficacy of  Butea monosperma  peptidase inhibitor against progressive growth and development of  H. armigera  suggest its usefulness in insect pest management of food crops.

biochemistry research international

A Nonhost Peptidase Inhibitor of ~14 kDa from<i>Butea monosperma</i>(Lam.) Taub. Seeds Affects Negatively the Growth and Developmental Physiology of<i>Helicoverpa armigera</i>

A Nonhost Peptidase Inhibitor of ~14 kDa fromButea monosperma(Lam.) Taub. Seeds Affects Negatively the Growth and Developmental Physiology ofHelicoverpa armigera