Abstract
The electroantennogram responses (EAGs) of Macrolophus melanotoma and Macrolophus pygmaeus (Hemiptera: Miridae) exposed to volatile compounds (VOCs) of host and non-host plants were compared. The VOCs were identified by gas chromatography. Hosts and non-hosts eliciting similar EAGs were tested in olfactory assays against plants without a significant EAGs for the two Macrolophus species. No characteristic VOC profile was found for hosts and non-hosts. Terpenes predominated in many hosts and carboxylic acids in non-hosts, but no specific VOCs were characteristic of host plants. Significant EAGs (maximum deflection values in mV) were recorded in plants with very different VOC profiles, both hosts and non-hosts. The EAGs were higher for M. melanotoma than for M. pygmaeus, and were higher for males than for females. In M. melanotoma the EAGs were greater with hosts than with non-hosts, but they were similar in M. pygmaeus. The EAGs were correlated with the concentrations of sesquiterpenes and alcohols in both species. In olfactory assays, M. melanotoma and M. pygmaeus preferred their respective hosts, but they did not discriminate between non-host with and without significant EAGs. According to the results, Macrolophus species are expected to rely on ubiquitous VOCs for the identification of their hosts. The variation in the EAGs between M. melanotoma and M. pygmaeus is attributed to the variation in the proportions of olfactory receptor neurones with different sensitivity to VOCs (e.g. sesquiterpenes). Host plant selection is discussed in the light of the perception of VOCs and the processing of information by the central nervous system.
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Acknowledgments
Juan Antonio Sánchez was awarded grants by the Ministerio de Ciencia e Innovación (Ramón y Cajal program) and the European Social Fund. Michelangelo La Spina received grants from the INIA. This work was funded in part by the research project PO07-007 (FEDER). We thank two anonymous reviewers for their inspiring comments.
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Ingegno, B.L., La-Spina, M., Jordan, M.J. et al. Host Plant Perception and Selection in the Sibling Species Macrolophus melanotoma and Macrolophus pygmaeus (Hemiptera: Miridae). J Insect Behav 29, 117–142 (2016). https://doi.org/10.1007/s10905-016-9549-1
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DOI: https://doi.org/10.1007/s10905-016-9549-1