Metabolic Profile of a Stored Grain Pest Trogoderma granarium Exposed to Deltamethrin
Metabolic Profile of a Stored Grain Pest Trogoderma granarium Exposed to Deltamethrin
Ambreena Hafiz1, Tanzeela Riaz2 and Farah Rauf Shakoori1*
ABSTRACT
Effect of deltamethrin on metabolic profile of 4th, 6th instar larvae and adult beetles of deltamethrin-resistant populations of T. granairum collected from wheat godowns of Gujranwala, Okara and D.G khan has been studied in current investigation. The toxicological data generated from deltamethrin-resistant populations was compared with deltamethrin-susceptible population that has not been exposed to any insecticide since thirteen years. From analysis of metabolic profile, it was found that soluble proteins, glucose contents and free amino acids increased, whereas glycogen and lipid contents were reduced in all deltamethrin-resistant populations as compared to deltamethrin-susceptible population. Soluble Proteins were significantly elevated (79, 100 and 37%) in 4th and 6th instar larvae and adult beetles of Gujranwala, (14, 24 and 14%) in Okara and (14, 13 and 2%) in D.G Khan populations, respectively compared to susceptible population. Free amino acids content of Gujranwala (22, 42, 75%), Okara (18, 30 and 17%) and D.G Khan (4, 15 and 25%) also showed the same trend of elevation in the 4th and 6th instar larvae and adult beetles, respectively compared to susceptible population. Glucose contents were significantly enhanced in Gujranwala (25, 336 and 356%), Okara (36, 163 and 74%) and D.G khan populations (122, 250 and 311%) for 4th and 6th instar larvae and adult beetles, respectively. Glycogen level, on the other hand, was significantly reduced in Gujranwala (82, 74 and 83%), Okara (27, 42 and 51%) and D.G khan populations (52, 56 and 64%) for 4th and 6th instar larvae and adult beetles, respectively when compared with susceptible population. Lipid contents of 4th and 6th instar larvae and adult beetles also depleted in Gujranwala (54, 65 and 65%), Okara (16, 21 and 25%) and D.G khan (36, 35 and 50%) populations, respectively as compared to susceptible population. To deal with stressful condition of exposure to deltamethrin, the insect utilizes its energy reserves to meet the energy requirement of enhanced metabolic activity.
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