Proteinase inhibitors of pigeonpea cv. BSMR 736: Characterization and bioefficacy against Helicoverpa armigera

Keywords: Proteinase inhibitors, pigeonpea, PPTI, helicoverpa armigera, HaGPs


Pigeonpea is an agriculturally important leguminous crop with high vulnerability to insect pest attack specifically, Helicoverpa armigera. The proteinase inhibitors (PIs) mediated host plant resistance against insect pests is a promising sustainable agricultural research practice. The current study was carried out to perceive biochemical characterization of proteinase inhibitors named PPTI in the pigeonpea (cv. BSMR 736). The purification of PPTI from crude protein seed extract was achieved by acetone precipitation, N-LP-IEF, and trypsin affinity chromatography. It was found to inhibit bovine trypsin and HaGPs in vitro. The optimal conditions for inhibition were pH 8 and temperature 40ºC. The PPTI showed four isoinhibitors bands on native, non-reducing and reducing SDS-PAGE in the range of 26.7–19.3 KDa. Upon resolution on two-dimensional gel electrophoresis (2-DE), PPTI produced nine pI variant spots having isoelectric point (pI) 6.6, 6.6, 6.3, 6.1, 5.9, 5.8, 5.7, 5.6 and 5.6. An artificial diet containing PPTI reduced the H. armigera larval weight about 69%, with 25% mortality. For eco-friendly sustainable agricultural practices, natural compounds like PPTI could be expressed in transgenic crops to prevent the invasion of H. armigera in pigeonpea.


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How to Cite
Shaikh F, Bradosty S, Gadge P, Jaiwal B, Padul M, Patil A. Proteinase inhibitors of pigeonpea cv. BSMR 736: Characterization and bioefficacy against Helicoverpa armigera. cuesj [Internet]. 1Aug.2022 [cited 18Aug.2022];6(2):9-6. Available from:
Research Article