Effect of jasmonic acid and salicylic acid induced resistance in groundnut on Helicoverpa armigera. (7th April 2014)

• Record Type: Journal Article
• Authors: War, Abdul R.; Sharma, Hari C.
• Is Part Of: Physiological entomology. Volume 39:Number 2(2014:Jun.)
• Page Start: 136
• Page End: 142
• Publication Date: 2014-04-07
• Subjects: Insects -- Physiology -- Periodicals; 571.157
• DOI: 10.1111/phen.12057
• Languages: English
• ISSNs: 0307-6962

Abstract

<abstract abstract-type="main" id="phen12057-abs-0001"> <title>Abstract</title> <p id="phen12057-para-0001">Induced resistance in plants affects insect growth and development as a result of the up‐regulation of defence‐related secondary metabolites or enzyme‐binding proteins. In the present study, the effects of jasmonic acid (JA) and salicylic acid (SA) induced resistance in groundnut on <italic>Helicoverpa armigera</italic> (Hübner) are examined. Larval survival, larval weights and the activities of digestive enzymes (total serine protease and trypsin) and of detoxifying enzymes [glutathione <italic>S</italic>‐transferase (GST) and esterase (EST)] are studied in insects fed on four groundnut genotypes with moderate levels of resistance to <italic>H. armigera</italic> (ICGV 86699, ICGV 86031, ICG 2271 and ICG 1697) and a susceptible genotype (JL 24). The plants are pre‐ and/or simultaneously treated with JA and SA, and then infested with <italic>H. armigera</italic>, which are allowed to feed for 6 days. Significantly lower serine protease and trypsin activities are observed in <italic>H. armigera</italic> fed on plants treated with JA. Greater GST activity is recorded in insects fed on JA and SA treated plants, whereas EST activity is low in <italic>H. armigera</italic> larvae fed on plants treated with JA and SA. Serine proteases, trypsin and GST activities and larval weights (<italic>r</italic> = 0.74–0.95) and larval survival (<italic>r</italic> = 0.77–0.93) are positively correlated, whereas EST activity and larval weight (<italic>r</italic> = −0.55) and larval survival (<italic>r</italic> = −0.65) are negatively correlated. The results suggest that midgut digestive and detoxifying enzymes can be used as indicators of the adverse effects of constitutive and/or induced resistance in crop plants on the insect pests and the role of JA and SA in insect pest management.</p> </abstract>