Variability in herbivore-induced signalling across different maize genotypes impacts significantly on natural enemy foragin behaviour

A - Papers appearing in refereed journals

Michereff, M. F. F., Magalhães, D. M., Hassemer, M. J., Laumann, R. A., Zhou, J-J., Ribeiro, P. E. de. A., Viana, P. A., Guimarães, P. E. de O., Schimmelpfeng, P. H. C., Borges, M., Pickett, J. A., Birkett, M. A. and Blassioli-Moraes, M. C. 2018. Variability in herbivore-induced signalling across different maize genotypes impacts significantly on natural enemy foragin behaviour. Journal of Pest Science. 92 (2), pp. 723-736.

AuthorsMichereff, M. F. F., Magalhães, D. M., Hassemer, M. J., Laumann, R. A., Zhou, J-J., Ribeiro, P. E. de. A., Viana, P. A., Guimarães, P. E. de O., Schimmelpfeng, P. H. C., Borges, M., Pickett, J. A., Birkett, M. A. and Blassioli-Moraes, M. C.
Abstract

‘Smart’ plants that release volatile defence compounds in response to pest damage, and which recruit beneficial natural enemies, offer an opportunity for exploiting biological control in future crop protection strategies. Using six maize genotypes, Zapalote Chico (‘landrace’), Mirt2A, Sintético Spodoptera (SS), L3, and two commercial hybrids BRS 4103 and BRS 1040, the aim of this work was to evaluate maize responses to larval damage from the fall armyworm Spodoptera frugiperda, a major maize pest in Brazil, and the ability of the egg parasitoid Telenomus remus to respond to HIPVs induced by S. frugiperda damage. Y-tube olfactometer bioassays with T. remus showed preferential responses to the S. frugiperda-induced volatiles of SS and BRS 4103 compared to constitutive volatiles of the same genotypes, but to none of the other genotypes tested. Chemical analysis of maize volatile extracts showed that SS produced more volatile compounds in response to S. frugiperda damage, followed by BRS 4103. In addition, higher levels of mono, homo-, or sesquiterpenes, together with green leaf volatiles (GLVs) were the most attractive blend for T. remus; however, there was no attraction when only GLVs were produced in higher levels. In summary, these results show that volatile defence signalling produced by maize plants due to S. frugiperda damage varies significantly depending on maize genotype and this variability influences T. remus foraging behaviour.

KeywordsInduced compounds; Indirect defence; Searching behaviour
Year of Publication2018
JournalJournal of Pest Science
Journal citation92 (2), pp. 723-736
Digital Object Identifier (DOI)doi:10.1007/s10340-018-1033-6
Open accessPublished as non-open access
Funder project or code14CONFAP: Brazil-UK Partnership on Delivering Pest Resilience in Brazilian Smallholder Maize Crops
BBSRC Strategic Programme in Smart Crop Protection
FunderBiotechnology and Biological Sciences Research Council
Output statusE-publication ahead of print
Publication dates
Online10 Aug 2018
Publication process dates
Accepted04 Aug 2018
Copyright licensePublisher copyright
PublisherSpringer Heidelberg
ISSN1612-4758

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