2014
DOI: 10.1556/abiol.65.2014.1.4
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A comparison of the levels of hydroxamic acids inAegilops speltoidesand a hexaploid wheat and effects onRhopalosiphum padibehaviour and fecundity

Abstract: Hydroxamic acids (HAs) are plant secondary metabolites produced by certain cereals, which have been found to be toxic to pest aphids in artificial diet assays. Previous studies have shown that tetraploid and hexaploid wheat varieties, the leaf tissues of which contained higher levels of these compounds than used in artificial diets, did not reduce aphid settling or fecundity. This current study reports findings on a high HA producing B genome accession of the diploid ancestor of wheat, Aegilops speltoides. We … Show more

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Cited by 7 publications
(5 citation statements)
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“…Even so, the higher levels recorded in the tetraploid varieties were not able to deter aphid settlement or reduce fecundity (Elek et al 2013a) but, in contrast, the high level detected in diploid wheat had a significant impact on S. avenae development (Gor-don-Weeks et al 2010). Moreover, Aegilops spel-toides, a diploid ancestor of wheat, showed very high levels of hydroxamic acids and substantially low nymph production for R. padi (Elek et al 2014). In this way, in genotypes where the hydroxamic acid con-centration is high, the aphids could reach the phloem avoiding them and/or before encountering sufficient toxic levels Elek et al 2014) and, in genotypes as the ones reported here, the lack of correlation could be a matter of low levels of DIMBOA.…”
Section: Discussionmentioning
confidence: 56%
See 1 more Smart Citation
“…Even so, the higher levels recorded in the tetraploid varieties were not able to deter aphid settlement or reduce fecundity (Elek et al 2013a) but, in contrast, the high level detected in diploid wheat had a significant impact on S. avenae development (Gor-don-Weeks et al 2010). Moreover, Aegilops spel-toides, a diploid ancestor of wheat, showed very high levels of hydroxamic acids and substantially low nymph production for R. padi (Elek et al 2014). In this way, in genotypes where the hydroxamic acid con-centration is high, the aphids could reach the phloem avoiding them and/or before encountering sufficient toxic levels Elek et al 2014) and, in genotypes as the ones reported here, the lack of correlation could be a matter of low levels of DIMBOA.…”
Section: Discussionmentioning
confidence: 56%
“…Moreover, Aegilops spel-toides, a diploid ancestor of wheat, showed very high levels of hydroxamic acids and substantially low nymph production for R. padi (Elek et al 2014). In this way, in genotypes where the hydroxamic acid con-centration is high, the aphids could reach the phloem avoiding them and/or before encountering sufficient toxic levels Elek et al 2014) and, in genotypes as the ones reported here, the lack of correlation could be a matter of low levels of DIMBOA. Thus, the assessment of hydroxamic acids in diploid and tetraploid wheat where a significant reduction in aphid development is imposed could offer an alternative to improve their levels in hexaploid wheat either by understanding their regulation or by producing synthetic wheat lines.…”
Section: Discussionmentioning
confidence: 56%
“…Typically, benzoxazinoids are synthesized in plastids and mobilized in the phloem sap and their effect on aphids depends on their abundance in the phloem. According to previous studies, benzoxazinoid levels in the phloem sap are much lower than that of the whole wheat leaves and aphids can avoid the higher toxicity levels of benzoxazinoids in mesophyll cells by careful probing [34,46]. Moreover, aphids can avoid the negative effects of benzoxazinoids due to the detoxification system [23].…”
Section: Discussionmentioning
confidence: 99%
“…For example, Ae. speltoides has been shown to be insect and disease resistant (Elek et al, 2014) and Thinopyrum bessarabicum salt tolerant (King et al, 1997).…”
Section: Introductionmentioning
confidence: 99%