Implication of oil based formulation of Beauveria bassiana vuillemin in inducing defense related enzymes in onion plants

Abstract

The foliar application of oil based formulation of B.bassiana (Bb 112) @ 108 spores ml-1 had significant influence on the induction of defense related enzymes against Thrips tabaci Lindeman infestation in onion. On four days after treatment (DAT), maximum activity of phenylalanine ammonia-lyase (0.63 μmol trans-cinnamic acid min-1 g-1 of fresh tissue) and total phenol content of 7.60 μg of catechol g-1 of fresh tissue was recorded. The maximum activity of lipoxygenase (0.21 min-1 g-1 of fresh tissue) was recorded on 6 DAT and on 10 DAT, peroxidase, polyphenol oxidase, catalase and super oxide dismutase (SOD) reached its maximum in thrips infested onion plants treated with foliar application of oil based formulation of Bb 112