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Effect of Phosphine on Esterases of Larvae and Adult Beetles of Phosphine-Exposed Populations of Stored Grain Pest, Trogoderma granarium Collected from Different Godowns of Punjab

Effect of Phosphine on Esterases of Larvae and Adult Beetles of Phosphine-Exposed Populations of Stored Grain Pest, Trogoderma granarium Collected from Different Godowns of Punjab

Tanzeela Riaz1, Farah Rauf Shakoori2* and Syed Shahid Ali3

1Faculty of Life Sciences, University of Central Punjab, Lahore, Pakistan
2Department of Zoology, University of the Punjab, Lahore, Pakistan
3Institute of Molecular Biology and Biotechnology, University of Lahore, Lahore, Pakistan

ABSTRACT

The present study was aimed at determining the possible role of esterases in development of tolerance/resistance in phosphine-tolerant populations. The level of total esterases, carboxyl esterases, choline esterases, acetylcholine esterases and aryl esterases were determined in 4th & 6th instar larvae and adult beetles of phosphine-tolerant populations (previously exposed to phosphine for 15 years) of wheat grain pest, Trogoderma granarium collected from various storage facilities of Punjab, Pakistan viz., Mandi Bahauddin-I, Mandi Bahauddin-II, Gujrat, Gujranwala and Sargodha. The activities of all esterases tested were significantly increased in all field collected phosphine-tolerant populations when compared with phosphine-susceptible population. Among developmental stages, the 4th instar larvae possessed higher esterase activities than 6th instar larvae and adult beetles in all populations of T. granarium. The increased level of esterases in phosphine tolerant populations as compared to susceptible population has pointed some correlation between esterase activities and phosphine tolerance.
 

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Pakistan Journal of Zoology (Associated Journals)

April

Vol. 49, Iss. 2, Pages 425-759

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