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

Authors:
Dr. Abdul Rashid War
Dr. Abdul Rashid War
TTaibah Univ
Visiting Scientist
Entomology, Crop protection, Insect plant interaction, induced resistance, insect biology, ecology
Saudi, A.P | India
Michael Gabriel Paulraj
Michael Gabriel Paulraj
Entomology Research Institute
India
Savarimuthu Ignacimuthu
Savarimuthu Ignacimuthu
Entomology Research Institute
Wind Point | United States
Hari Chand Sharma
Hari Chand Sharma
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)
India

Pest Manag Sci 2015 Jan 4;71(1):72-82. Epub 2014 Apr 4.

International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India; Entomology Research Institute, Loyola College, Chennai, Tamil Nadu, India.

Background: Induced 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 to insects 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 were also recorded on plant damage and H. armigera larval weights and survival.

Results: Higher levels of enzymatic activities and 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, JA and SA showed similar effects.

Conclusion: JA 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 to SA, and resulted in reduced plant damage, and larval weights and survival, suggesting that induced resistance can be used as a component of pest management in groundnut.

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http://doi.wiley.com/10.1002/ps.3764
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http://dx.doi.org/10.1002/ps.3764DOI Listing

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January 2015
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