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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Differential inhibition of Helicoverpa armigera gut proteinases by proteinase inhibitors of pigeonpea (Cajanus cajan) and its wild relatives.
Phytochemistry 2003 October
The seeds of 36 pigeonpea [Cajanus cajan (L) Millsp.] cultivars, resistant and susceptible to pests and pathogens and 17 of its wild relatives were analysed for inhibitors of trypsin, chymotrypsin, and insect gut proteinases to identify potential inhibitors of insect (Helicoverpa armigera) gut enzymes. Proteinase inhibitors (PIs) of pigeonpea cultivars showed total inhibition of trypsin and chymotrypsin, and moderate inhibition potential towards H. armigera proteinases (HGP). PIs of wild relatives exhibited stronger inhibition of HGP, which was up to 87% by Rhynchosia PIs. Electrophoretic detection of HGPI proteins and inhibition of HGP isoforms by few pigeonpea wild relative PIs supported our enzyme inhibitor assay results. Present results indicate that PIs exhibit wide range of genetic diversity in the wild relatives of pigeonpea whereas pigeonpea cultivars (resistant as well as susceptible to pests and pathogens) are homogeneous. The potent HGPIs identified in this study need further exploration for their use in strengthening pigeonpea defence against H. armigera.
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