Hydroxamic acids in Aegilops species and effects on Rhopalosiphum padi behaviour and fecundity

Elek, H., Smart, L., Martin, J., Ahmad, S., Gordon-Weeks, R., Anda, A., Welham, S., Wenner, C. P. and Pickett, John ORCID: https://orcid.org/0000-0002-8386-3770 2013. Hydroxamic acids in Aegilops species and effects on Rhopalosiphum padi behaviour and fecundity. Bulletin of Insectology 66 (2) , pp. 213-220.

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Abstract

As an environmentally compatible alternative to the use of conventional insecticides to control cereal aphids, the possibility of exploiting natural resistance to insect pests in wheat species was investigated. Previous work, comparing the antibiotic and antixenotic effects of hexaploid wheat (Triticum aestivum, AABBDD), tetraploid wheat (Triticum durum, AABB) and some A genome diploid species on the bird cherry-oat aphid, Rhopalosiphum padi L., found little difference between accessions in the higher ploidy plants, but the diploid species contained attributes that could be important in the breeding for resistance against aphids in the future. This study concentrated on wild accessions of diploid Aegilops species to which the closest ancestor of the B genome donor of hexaploid wheat belongs. The aphid R. padi showed reduced attraction and an increase in the intrinsic rate of population growth on the B genome species tested by compared to the hexaploid control. Investigation of a group of secondary metabolites, the hydroxamic acids or benzoxazinones showed that leaf tissue of one of these (Aegilops speltoides) contains high levels of DIMBOA-glucoside and of the main aglucone, 2,4-dihidroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) while no hydroxamic acids were found in the leaf tissue of Ae. longissima, Ae. bicornis and Ae. sharonensis and only trace levels in Ae. searsii. In those species, an unknown compound was present, which may have an effect on aphid behaviour. The effect of aphid feeding on levels of hydroxamic acids in Ae. speltoides and Ae. sharonensis was also examined. While a localised defence reaction to aphid feeding had been identified in the hexaploid and tetraploid species, a more systemic effect was observed in the diploid Ae. speltoides.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry
Publisher:	Pensoft Publishers
ISSN:	1721-8861
Date of Acceptance:	18 June 2013
Last Modified:	03 Feb 2026 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/184317

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