Resistance to the Weevils Cylas puncticollis and Cylas brunneus Conferred by Sweetpotato Root Surface Compounds
Loading...
Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Agricultural and Food Chemistry
Abstract
Seven resistant varieties of sweetpotato were compared with three susceptible varieties in field trials and laboratory
bioassays and showed that resistance was an active process rather than an escape mechanism, as field resistant varieties also had
reduced root damage and oviposition compared with susceptible varieties in the laboratory. Liquid chromatography−mass
spectrometry (LC−MS) of root surface and epidermal extracts showed significant variation in the concentration of hexadecyl,
heptadecyl, octadecyl, and quinic acid esters of caffeic and coumaric acid, with higher concentrations correlated with resistance.
All compounds were synthesized to enable their positive identification. Octadecyl coumarate and octadecyl caffeate applied to the
surface of susceptible varieties in laboratory bioassays reduced feeding and oviposition, as observed on roots of resistant varieties,
and therefore are implicated in weevil resistance. Segregating populations from breeding programs can use these compounds to
identify trait loci for resistance and enable the development of resistant varieties
Description
Keywords
Hydroxycinnamic acid esters, Resistance, Sweetpotato varieties, Weevils
Citation
Anyanga, M. O., Muyinza, H., Talwana, H., Hall, D. R., Farman, D. I., Ssemakula, G. N., ... & Stevenson, P. C. (2013). Resistance to the weevils Cylas puncticollis and Cylas brunneus conferred by sweetpotato root surface compounds. Journal of Agricultural and Food Chemistry, 61(34), 8141-8147. dx.doi.org/10.1021/jf4024992