| Title: | Interspecific Cross-Attraction between the South American Cerambycid Beetles Cotyclytus curvatus and Megacyllene acuta is Averted by Minor Pheromone Components |
| Author(s): | Silva WD; Millar JG; Hanks LM; Costa CM; Leite MOG; Tonelli M; Bento JMS; |
| Address: | "Department of Entomology and Acarology, University of Sao Paulo, Piracicaba, SP, 13418900, Brazil. wdsilv@gmail.com. Departments of Entomology and Chemistry, University of California, Riverside, CA, 92521, USA. Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. Department of Entomology and Acarology, University of Sao Paulo, Piracicaba, SP, 13418900, Brazil" |
| DOI: | 10.1007/s10886-018-0933-5 |
| ISSN/ISBN: | 1573-1561 (Electronic) 0098-0331 (Linking) |
| Abstract: | "During field screening trials conducted in Brazil in 2015, adults of both sexes of the cerambycid beetles Cotyclytus curvatus (Germar) and Megacyllene acuta (Germar) (subfamily Cerambycinae, tribe Clytini) were significantly attracted to racemic 3-hydroxyhexan-2-one and racemic 2-methylbutan-1-ol, chemicals which previously have been identified as male-produced aggregation-sex pheromones of a number of cerambycid species endemic to other continents. Subsequent analyses of samples of beetle-produced volatiles revealed that males of C. curvatus sex-specifically produce only (R)-3-hydroxyhexan-2-one, whereas males of M. acuta produce the same compound along with lesser amounts of (2S,3S)-2,3-hexanediol and (S)-2-methylbutan-1-ol. Follow-up field trials showed that both sexes of both species were attracted to synthetic reconstructions of their respective pheromones, confirming that males produce aggregation-sex pheromones. The minor pheromone components of M. acuta, (S)-2-methylbutan-1-ol and (2S,3S)-2,3-hexanediol, synergized attraction of that species, but antagonized attraction of C. curvatus to (R)-3-hydroxyhexan-2-one. Beetles of other cerambycine species also were attracted in significant numbers, including Chrysoprasis linearis Bates, Cotyclytus dorsalis (Laporte & Gory), and Megacyllene falsa (Chevrolat). Our results provide further evidence that 3-hydroxyhexan-2-one is a major component of attractant pheromones of numerous cerambycine species world-wide. Our results also highlight our increasing understanding of the crucial role of minor pheromone components in imparting species specificity to cerambycid pheromone blends, as is known to occur in numerous species in other insect families" |
| Keywords: | "Animals Biological Assay Coleoptera/*drug effects Female Male Sex Attractants/*pharmacology Sexual Behavior, Animal/*drug effects Volatile Organic Compounds/pharmacology Coleoptera Longhorned beetle Mate location Pheromone chemistry Reproductive isolation;" |
| Notes: | "MedlineSilva, Weliton D Millar, Jocelyn G Hanks, Lawrence M Costa, Camila M Leite, Mariana O G Tonelli, Mateus Bento, Jose Mauricio S eng 2013/26936-2/Fundacao de Amparo a Pesquisa do Estado de Sao Paulo/ 2014/50871-0; 465511/2014-7/INCT - Semioquimicos na Agricultura (FAPESP/CNPq)/ 15-8130-1422-CA/USDA-APHIS/ ./Alphawood Foundation of Chicago/ 2018/02/13 J Chem Ecol. 2018 Mar; 44(3):268-275. doi: 10.1007/s10886-018-0933-5. Epub 2018 Feb 12" |
