Induced resistance to Helicoverpa armigera through exogenous application of jasmonic acid and salicylic acid in groundnut, Arachis hypogaea uri icon

abstract

  • BackgroundInduced resistance to Helicoverpa armigera through exogenous application of jasmonic acid (JA) and salicylic acid (SA) was studied in groundnut genotypes (ICGV 86699, ICGV 86031, ICG 2271 and ICG 1697) with different levels of resistance and the susceptible check, JL 24 under greenhouse conditions. Activities of oxidative enzymes and the amounts of secondary metabolites and proteins were quantified at 6 days after JA and SA application/insect infestation. Data was also recorded on plant damage and H. armigera larval weights and survival.ResultsHigher levels of enzymatic activities and the amounts of secondary metabolites were observed in the insect-resistant genotypes pretreated with JA and then infested with H. armigera than in JL 24. The insect-resistant genotypes suffered lower insect damage and resulted in poor survival and lower weights of H. armigera larvae than JL 24.In some cases, both JA and SA showed similar effect.ConclusionJA and SA induced the activity of antioxidative enzymes in groundnut plants against H. armigera, and reduced its growth and development. However, induced response to application of JA was greater than SA, and resulted in reduced plant damage, larval weights and survival, suggesting that induced resistance can be used as a component of pest management in groundnut

publication date

  • 2015
  • 2015