Jasmonic Acid-Mediated-Induced Resistance in Groundnut (Arachis hypogaea L.) Against Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) |
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Authors: | Abdul Rashid War Michael Gabriel Paulraj Mohd Yousf War Savarimuthu Ignacimuthu |
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Institution: | (1) Entomology Research Institute, Loyola College, Chennai, Tamil Nadu, 600034, India;(2) Government Degree College Sopore, Jammu & Kashmir, 193201, India; |
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Abstract: | Jasmonic acid (JA) acts as a signal molecule to induce resistance in plants against herbivores and its levels are elevated
in plants after wounding or insect damage. Groundnut is an important crop in many tropical and subtropical regions worldwide,
but there is surprisingly little knowledge on its induced defenses against herbivores. The effect of JA as a spray on induced
resistance in three groundnut genotypes, namely, ICGV 86699 (resistant), NCAc 343 (resistant), and TMV 2 (susceptible), against
Helicoverpa armigera was studied. The activity of oxidative enzymes peroxidase (POD) and polyphenol oxidase (PPO)] and the amounts of other host
plant defense components total phenols, hydrogen peroxide (H2O2), malondialdehyde (MDA), and protein content] were recorded at 24, 48, 72, and 96 h after pretreatment (1 day) with JA followed
by infestation with H. armigera (PJA + HIN) and H. armigera infestation with simultaneous JA application (HIN + JA) to understand the consequences of induced resistance in groundnut.
The plant damage, larval survival, and larval weights were also recorded. There was a significant increase in POD and PPO
activities and in the amounts of total phenols, H2O2, MDA, and proteins in PJA + HIN- and JA + HIN-treated plants as compared to the plants treated with JA and infested with
H. armigera individually and to untreated control plants. Among all the genotypes, the strongest induction of defense was observed in
the ICGV 86699 genotype. It is concluded that pretreatment with JA and its application during low levels of insect infestation
can increase the levels of host plant resistance against herbivorous insects and reduce the pest-associated losses in groundnut. |
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