Insecticidal activity and the mechanism of action of three phenylpropanoids isolated from the roots of Piper sarmentosum Roxb

Hematpoor, A. and Liew, S.Y. and Sofian-Azirun, Mohd and Awang, Khalijah (2017) Insecticidal activity and the mechanism of action of three phenylpropanoids isolated from the roots of Piper sarmentosum Roxb. Scientific Reports, 7 (1). p. 12576. ISSN 2045-2322

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Official URL: http://dx.doi.org/10.1038/s41598-017-12898-z

Abstract

Hexane, dichloromethane and methanol extracts of the roots of Piper sarmentosum Roxb. were screened for toxicity towards Sitophilus oryzae (L.), Rhyzopertha Dominica (F.), and Plodia interpunctella (Hübner) and the hexane extract exhibited the highest mortality percentage. Bioassay-guided fractionation of the hexane extract resulted in the isolation of asaricin 1, isoasarone 2, and trans-asarone 3. Asaricin 1 and isoasarone 2 were the most toxic compounds to Sitophilus oryzae, Rhyzopertha Dominica, and Plodia interpunctella. Sitophilus oryzae and Rhyzopertha Dominica exposed to asaricin 1 and isoasarone 2 required the lowest median lethal time. Insecticidal activity of trans-asarone 3 showed consistent toxicity throughout the 60 days towards all three insects as compared to asaricin 1 and isoasarone 2. Asaricin 1 and isoasarone 2 at different doses significantly reduced oviposition and adult emergence of the three insects in treated rice. Trans-asarone 3 had lowest toxicity with highest LC and LT values in all tested insects relative to its mild oviposition inhibition and progeny activity. Moreover, asaricin 1 and isoasarone 2 significantly inhibited acetylcholinesterase in comparison with trans-asarone 3 and the control. Acetylcholinesterase inhibition of Rhyzopertha Dominica and Plodia interpunctella by asaricin 1 and isoasarone 2 were lower than that of Sitophilus oryzae, which correlated with their higher resistance.

Item Type: Article
Uncontrolled Keywords: Insecticidal activity; Phenylpropanoids; Roots; Piper sarmentosum Roxb
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Aug 2018 03:52
Last Modified: 01 Mar 2019 09:10
URI: http://eprints.um.edu.my/id/eprint/18991

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