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Chemical basis for resistance in sweetpotato Ipomoea batatas to the sweetpotato weevil Cylas puncticollis

Chemical basis for resistance in sweetpotato Ipomoea batatas to the sweetpotato weevil Cylas puncticollis

Stevenson, Philip C., Muyinza, Harriet, Hall, David R., Porter, Elaine A., Farman, Dudley I., Talwana, Herbert and Mwanga, Robert O.M. (2009) Chemical basis for resistance in sweetpotato Ipomoea batatas to the sweetpotato weevil Cylas puncticollis. Pure and Applied Chemistry, 81 (1). pp. 141-151. ISSN 0033-4545 (Print), 1365-3075 (Online) (doi:10.1351/PAC-CON-08-02-10)

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Abstract

The aim of this work was to determine the basis of resistance in a sub-Saharan sweetpotato variety, New Kawogo, to the African sweetpotato weevil Cylas puncticollis. This insect feeds on the roots, reducing quality and yield, and is the most important production constraint of sweetpotato in Africa. Laboratory bioassays were designed to determine how the performance of weevils differed on susceptible and resistant roots. Subsequently, liquid chromatography-mass spectrometry (LC-MS) analysis of the root surface and root latex identified quantitative and qualitative differences in the chemical profiles with higher levels of octadecyl and hexadecyl esters of hydroxycinnamic acids reported in the resistant variety. The compounds were synthesized to confirm their identity and incorporated into artificial diets for bioassays on C. puncticollis. High levels of mortality and developmental inhibition were recorded for larvae feeding on treated diets, and the effect was dose-dependent. Thus, in contrast to previous work on resistant African sweetpotato cultivars, resistance in New Kawogo is not only active, but is quantifiable and manageable for breeding. Work is underway to determine what effect these compounds have on the weevils at a molecular level. The inheritance of the root latex esters will be studied in new crosses and mapped in new populations using quantitative trait loci (QTLs) that are currently being developed.

Item Type: Article
Additional Information: [1] First published: 2009. [2] Published as: Pure and Applied Chemistry, (2009), Vol. 81, (1), pp. 141-151. [3] Paper based on a presentation at CHEMRAWN XII: The Role of Chemistry in Sustainable Agriculture and Human Well-being in Africa, 2–5 December 2007, Stellenbosch, South Africa.
Uncontrolled Keywords: hexadecyl estersoctadecyl esters, hydroxycinnamic acid, caffeic acid ester, coumaric, root latex, Ipomoea batatas, Cylas brunneus, resistance
Subjects: S Agriculture > S Agriculture (General)
Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
S Agriculture > SB Plant culture
Faculty / Department / Research Group: Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Related URLs:
Last Modified: 03 Jul 2013 15:51
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/2023

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