Mechanism for saltational shifts in pheromone communication systems

Baker, Thomas C.

doi:10.1073/pnas.222539799

Cited by 82 publications

(79 citation statements)

References 19 publications

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“…Alternatively, our result suggests that species using the three-component pheromone constitute a group that is ancestral to ACB, ECB, and O. scapulalis in which Z9-14:OAc is an antagonist. This hypothesis is more in agreement with the phylogenetic relationships based on morphological data (Mutuura and Munroe, 1970;Ishikawa et al, 1999a), and the idea that agonist functionality precedes the emergence of antagonism in the evolution of pheromone systems Baker, 2002).…”

Section: Functional Role Of Z9-14:oac and The Evolution Of Pheromone supporting

confidence: 84%

“…The upwind flight percentages are comparable with levels of 3-5% for ECB males of the UZ and BE races that responded to the ACB blend (Linn et al, 2003). The finding that some ACB males can detect and respond to the ECB pheromone blends adds to a growing list of cases involving the presence of broadly responsive individuals in moth populations (Baker, 2002) that have the capacity to process information about pheromone components utilized by related species in an agonistic manner. The adaptive value of being a broad responder is that these individuals have the potential to exploit new communication channels, as has been proposed for the ACB (Baker, 2002;Roelofs et al, 2002).…”

Section: Rare Acb Males Responding To the Ecb Pheromone Blendsmentioning

confidence: 57%

“…The finding that some ACB males can detect and respond to the ECB pheromone blends adds to a growing list of cases involving the presence of broadly responsive individuals in moth populations (Baker, 2002) that have the capacity to process information about pheromone components utilized by related species in an agonistic manner. The adaptive value of being a broad responder is that these individuals have the potential to exploit new communication channels, as has been proposed for the ACB (Baker, 2002;Roelofs et al, 2002). The finding also is not entirely unexpected given the proposed phylogenetic relationships in the Ostrinia (Ishikawa et al, 1999a, b).…”

Section: Rare Acb Males Responding To the Ecb Pheromone Blendsmentioning

confidence: 98%

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More Rare Males in Ostrinia: Response of Asian Corn Borer Moths to the Sex Pheromone of the European Corn Borer

2006

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A previous flight tunnel study showed that 3-5% of European corn borer (ECB) moths, Ostrinia nubilalis (Z/E11-14:OAc), could fly upwind and make contact with sources releasing the sex pheromone of the related Asian corn borer (ACB), Ostrinia furnacalis (2:1 Z/E12-14:OAc). In this study, we show that rare males (3-4%) are also present in South Korean ACB that respond to the sex pheromone blends of the ECB UZ (97:3 Z/E11-14: OAc) and BE (1:99 Z/E11-14:OAc) pheromone races. We also show that the upwind flight response of a significant proportion of male ACB was antagonized by the addition of 1% Z9-14:OAc to the ACB blend, a compound that also antagonizes the upwind flight of ECB males. Male ACB flight behavior was not, however, affected by adding either of the ECB blends to the ACB blend, or by the addition of 50% 14:OAc, a compound identified from female pheromone glands of ACB and a number of other Ostrinia species. Additional flight tunnel tests with ACB to study the comparative aspects of ECB and ACB pheromone response specificity showed that male ACB exhibited maximal levels of upwind flight and source contact with doses of pheromone (30 and 100 μg on rubber septum sources) that also elicited maximal levels in the two ECB pheromone races. The maximal level of source contact for ACB (66%) was lower than observed with the UZ race of ECB to its pheromone blend (>95%), but comparable to those for the BE race of ECB (65-70%). Male ACB also flew upwind in high proportions to a broader range of ratios of Z/E12-14:OAc (80:20 to 20:80) than was previously observed for either of the ECB races.

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Section: Functional Role Of Z9-14:oac and The Evolution Of Pheromone supporting

confidence: 84%

Section: Rare Acb Males Responding To the Ecb Pheromone Blendsmentioning

confidence: 57%

Section: Rare Acb Males Responding To the Ecb Pheromone Blendsmentioning

confidence: 98%

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More Rare Males in Ostrinia: Response of Asian Corn Borer Moths to the Sex Pheromone of the European Corn Borer

2006

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“…Here, we showed that the separate control of sex-pheromone emission and reception depends on the effect of distinct putative regulatory regions targeting either nonneuronal cells necessary for pheromone biosynthesis or neurons involved in pheromone perception. If, in several moths species, the emergence of new olfactory signals depends on desaturase enzymes, their involvement in the reception of these signals has not been shown (30). For exemple, in the European Corn Borer Ostrinia nubilalis, the system of pheromonal communication depends on factors segregating with different chromosomes and with distinct loci on the same autosome (12).…”

Section: Discussionmentioning

confidence: 99%

Expression of a desaturase gene,desat1, in neural and nonneural tissues separately affects perception and emission of sex pheromones inDrosophila

Bousquet

Nojima

Houot

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

101

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Animals often use sex pheromones for mate choice and reproduction. As for other signals, the genetic control of the emission and perception of sex pheromones must be tightly coadapted, and yet we still have no worked-out example of how these two aspects interact. Most models suggest that emission and perception rely on separate genetic control. We have identified a Drosophila melanogaster gene, desat1, that is involved in both the emission and the perception of sex pheromones. To explore the mechanism whereby these two aspects of communication interact, we investigated the relationship between the molecular structure, tissue-specific expression, and pheromonal phenotypes of desat1. We characterized the five desat1 transcripts-all of which yielded the same desaturase protein-and constructed transgenes with the different desat1 putative regulatory regions. Each region was used to target reporter transgenes with either (i) the fluorescent GFP marker to reveal desat1 tissue expression, or (ii) the desat1 RNAi sequence to determine the effects of genetic down-regulation on pheromonal phenotypes. We found that desat1 is expressed in a variety of neural and nonneural tissues, most of which are involved in reproductive functions. Our results suggest that distinct desat1 putative regulatory regions independently drive the expression in nonneural and in neural cells, such that the emission and perception of sex pheromones are precisely coordinated in this species.sensory communication | pleiotropy | hydrocarbon | oenocyte

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“…The traditional view emphasizes slow and gradual changes in sex pheromone blends due to the need for optimal recognition. Recently, however, it has been shown in moths that major saltational changes in signal chemistry can occur due to alterations in pheromone biosynthetic pathways, and that such shifts may initiate species divergence (Baker 2002, Roelofs et al 2002. Studies in moths and bark beetles have revealed substantial differences in pheromones between closely related taxa, which appear to support a saltational mode of signal evolution (Lo¨fstedt et al 1991, Symonds andElgar 2004).…”

Section: Saltational Mode Of Fragrance Evolution?mentioning

confidence: 99%

Chemical niche differentiation among sympatric species of orchid bees

Zimmermann

Ramírez

Eltz

2009

Ecology

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Abstract. Male Neotropical orchid bees (Euglossini ) collect volatile substances (fragrances) from flowers and other sources (e.g., decaying wood) and store them in specialized hind tibial pockets. The accumulated chemicals are later emitted during courtship display, presumably to lure conspecific females for mating. We analyzed tibial fragrances of males of 15 sympatric Panamanian species in the genus Euglossa to test whether communities of euglossine bees are chemically structured, and to elucidate whether male fragrance signals evolve to convey premating isolation. Our analysis revealed substantial chemical disparity among all lineages. Disparity was mediated by compounds that were exclusive to certain species but also by differences in relative quantity of shared compounds. We mapped tibial fragrance compounds present in each species on a DNA-based phylogeny (reconstructed using partial sequences of COI, EF1-a, ArgK, and Pol-II ) and found that most dominant compounds were highly homoplasious. In an analysis of chemical differentiation in relation to phylogenetic divergence through time, disparity was greater than expected from a null model at any point during evolutionary history, suggesting that diversifying selection has shaped fragrance phenotypes. Notably, chemical disparity was greater within recently diverged lineages than among them, suggesting that chemical preferences in orchid bees evolved rapidly in the early stages of species divergence. We postulate communication interference as the possible mechanism behind the observed fragrance differentiation, which may be the product of reproductive character (fragrance) displacement. Our findings are consistent with the hypothesis that male fragrance signals evolve to convey premating isolation.

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Mechanism for saltational shifts in pheromone communication systems

Cited by 82 publications

References 19 publications

More Rare Males in Ostrinia: Response of Asian Corn Borer Moths to the Sex Pheromone of the European Corn Borer

More Rare Males in Ostrinia: Response of Asian Corn Borer Moths to the Sex Pheromone of the European Corn Borer

Expression of a desaturase gene,desat1, in neural and nonneural tissues separately affects perception and emission of sex pheromones inDrosophila

Chemical niche differentiation among sympatric species of orchid bees

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