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The Importance of Oligosulfides in the Attraction of Fly The Importance of Oligosulfides in the Attraction of Fly Pollinators to the Brood-Site Deceptive Species Jaborosa rotacea (Solanaceae) Author(s): Marcela Moré, Andrea A. Cocucci, and Robert A. Raguso Source: International Journal of Plant Sciences, Vol. 174, No. 6 (July/August 2013), pp. 863- 876 Published by: The University of Chicago Press Stable URL: http://www.jstor.org/stable/10.1086/670367 . Accessed: 20/06/2013 11:53 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences. http://www.jstor.org This content downloaded from 146.201.208.22 on Thu, 20 Jun 2013 11:53:41 AM All use subject to JSTOR Terms and Conditions Int. J. Plant Sci. 174(6):863–876. 2013. ᭧ 2013 by The University of Chicago. All rights reserved. 1058-5893/2013/17406-0002$15.00 DOI: 10.1086/670367 THE IMPORTANCE OF OLIGOSULFIDES IN THE ATTRACTION OF FLY POLLINATORS TO THE BROOD-SITE DECEPTIVE SPECIES JABOROSA ROTACEA (SOLANACEAE) Marcela More´,1,* Andrea A. Cocucci,* and Robert A. Raguso† *Laboratorio de Ecologı´a Evolutiva y Biologı´a Floral, Instituto Multidisciplinario de Biologı´a Vegetal (Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas–Universidad Nacional de Co´rdoba), Casilla de Correo 495, X5000ZAA, Co´rdoba, Argentina; and †Department of Neurobiology and Behavior, Cornell University, Ithaca, New York 14853, USA Premise of research. Brood-site deceptive flowers use dishonest signals—especially floral odors that mimic oviposition substrates—to attract and deceive saprophilous insects to pollinate them. In this work, we recorded the pollinators of the sapromyiophilous species Jaborosa rotacea (Solanaceae) endemic to southern South America. Then, we characterized the floral volatiles of this species, and finally, we carried out field experiments to decouple the effects of scent and color as attractants for saprophilous flies. Methodology. We made direct observations of pollinators in a natural population of J. rotacea.We characterized floral volatiles by means of gas chromatography–mass spectrometry. Subsequently, we used a mixture of 2 oligosulfides (dimethyl disulfide and dimethyl trisulfide), which our analyses revealed were the main constituents of the floral scent of J. rotacea, as baits to determine the attractiveness of this olfactory signal to flies in a geographical region where J. rotacea is not present. Finally, we used the same foul-scented baits in arrays of artificial flowers resembling those of J. rotacea to assess the dual importance of olfactory and visual cues in fly attraction. Pivotal results. Pollination of J. rotacea occurs when saprophilous flies belonging to the families Calli- phoridae, Muscidae, and Sarcophagidae—with similar body dimensions to the anther-stigma distance in these flowers—acquire and deposit pollen in the flowers in a nototribic mode. Our chemical analyses revealed that J. rotacea floral scent is chemically simple and features 2 oligosulfide compounds (dimethyl disulfide and dimethyl trisulfide) commonly found in carrion-mimicking flowers. We found that saprophilous flies belonging to the same families that we recorded as pollinators of J. rotacea in its native South American habitat were attracted to foul-scented baits in temperate North America. The flies’ visitation frequencies (recorded as approaches and landings on the artificial flowers) depended significantly on the presence of the foul-scented baits. Conclusions. These results support the hypothesis that oligosulfides are universally effective signals by which deceptive flowers may effect pollen dispersal by attracting flies that use carrion or carnivore feces as brood sites. Keywords: brood-site deceptive flowers, Diptera, Jaborosa rotacea, oligosulfides, scent mimicry, Solanaceae. Introduction Aristolochia, and Stapelia) known in the natural world (Davis et al. 2008). Sapromyiophilous flowers sensu stricto (i.e., pol- Several unrelated groups of plants benefit from cross-pol- linated by saprophilous flies) usually exhibit features charac- lination by biotic agents even though they do not provide any teristic of decaying animal or fecal matter, for example, dull- kind of reward, a phenomenon known as pollination by de- colored corollas often checkered with dark blotches and ception (Dafni 1984; Renner 2006). Well-known examples of showing hairy structures or filiform appendages and, espe- deceitful plant species include food deceptive, sexually decep- cially, fetid odors (Raguso 2004; Ju¨ rgens et al. 2006; van der tive, and brood-site deceptive flowers (Jersa´kova´ et al. 2009; Niet et al. 2011). Thus, pollinators are deceived by dishonest Vereecken 2009; Urru et al. 2011). Flowers pollinated by sap- visual and olfactory floral cues thought to evoke insect sensory rophilous insects—that is, those that use carrion or feces as responses to decaying substances used by the pollinators as food and brood sites—have evolved in several unrelated an- brood sites (Urru et al. 2011). giosperm families worldwide (Vogel 1954; Wiens 1978; Ack- There is good evidence that the attraction of flies to sap- erman 1986; Endress 1994) and include some of the largest romyiophilous flowers depends greatly on the emission of vol- and most unusual blossoms (e.g., Rafflesia, Amorphophallus, atiles that are used by flies as cues to locate food and brood sites. Recent chemical analyses of fetid odors have demon- 1 Author for correspondence; e-mail: [email protected]. strated that different sources of putrefaction are typified by Manuscript received September 2012; revised manuscript received February very distinct and specific compounds, for example, urine (hex- 2013; electronically published May 15, 2013. anoic acid, carboxylic acids, and pyrazines), rotting carcasses 863 This content downloaded from 146.201.208.22 on Thu, 20 Jun 2013 11:53:41 AM All use subject to JSTOR Terms and Conditions 864 INTERNATIONAL JOURNAL OF PLANT SCIENCES (heptanal and octanal), decaying meat and carnivore dung (oli- Material and Methods gosulfides), herbivore dung (indole and cresol), and rotting fruit (oxygenated aliphatic compounds, such as acetic acid, Studied Species acetoin, and 3-methylbutanol; Kite and Hetterscheid 1997; Kite et al. 1998; Stensmyr et al. 2002; Ju¨ rgens et al. 2006; Jaborosa rotacea is a coarse, weedy herbaceous plant dis- Goodrich and Raguso 2009; Johnson and Ju¨ rgens 2010; Urru tributed in the pre-Puna biogeographical province, from south- et al. 2011). Insect-trapping studies have established that sim- ernmost Bolivia to northwestern Argentina, between 1500 and ple blends of sulfides, indole, cresol, and/or butanoic acid are 3600 m in altitude (Barboza and Hunziker 1998; fig. 1A). Each effective in trapping calliphorid flies across Europe, Africa, and plant can develop hundreds of flowers, which are located near Australia (Hall et al. 2003; Aak et al. 2010). In their study of ground and are concealed by relatively large and numerous carrion-mimicking flowers and fungi, Borg-Karlson et al. leaves growing in a loose rosette (fig. 1A). Flowers are maroon (1994) mentioned that flies of the genera Calliphora, Lucilia, to black, densely covered by whitish hairs (fig. 1B), and emit and Sarcophaga in Scandinavia were attracted to dimethyl di- a strong fetid odor during daytime that can be perceived by sulfide (DMDS). More recently, Stensmyr et al. (2002) ob- humans from a distance of several meters. The floral nectary tained high levels of blowfly attraction to odorless second-day is vestigial, composed of a group of secretory cells that lack inflorescences of Helicodiceros muscivorus (Araceae) in Sar- stomata and do not form a disc (Cocucci 1988). However, the dinia by augmenting them with dimethyl mono-, di-, and tri- adaxial surface of the petals is densely covered by multicellular sulfides, the volatile compounds responsible for the intense foul glandular hairs that produce a sugar solution (Cocucci 1988). odor of first-day inflorescences. Similarly, Shuttleworth and Unlike many other plant species with carrion-mimicking flow- Johnson (2010) demonstrated that the addition of these same ers (e.g., Aristolochiaceae, Araceae, Hydnoraceae), J. rotacea compounds to the inflorescences of wasp-pollinated South Af- has open and rotate flowers that neither form chambers nor rican species of Eucomis (subfamily Scilloideae, family As- hold visiting flies captive (Cocucci 1988, 1999). Similar rotate paragaceae) was sufficient to induce a shift to carrion fly pol- flowers are also present in several sapromyiophilous species of lination. These results, together with investigations of antennal Asclepiadoideae that have radiated in the New World, such as sensitivity and behavioral bioassays (Cosse´ and Baker 1996; Gonolobus spp. and Matelea spp. or the stapeliads (family Stensmyr et al. 2002), support the hypothesis that a few specific Apocynaceae) and Eucomis flowers (family Asparagaceae) of scent compounds are sufficient to attract saprophilous flies in the Old World (Ollerton and Liede 1997; Ju¨ rgens et al. 2006; a variety of settings and habitats. Shuttleworth
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