| Title: | "Contact sex pheromone components of the seed beetle, Callosobruchus analis (F.)" |
| Author(s): | Shimomura K; Akasaka K; Yajima A; Mimura T; Yajima S; Ohsawa K; |
| Address: | "Department of Bioscience, Faculty of Applied Bioscience, Tokyo University of Agriculture, Tokyo, 156-8502, Japan. k3shimom@nodai.ac.jp" |
| DOI: | 10.1007/s10886-010-9841-z |
| ISSN/ISBN: | 1573-1561 (Electronic) 0098-0331 (Linking) |
| Abstract: | "Callosobruchus analis (Coleoptera: Chrysomelidae: Bruchinae), found throughout tropical Asia and Africa, is a pest of stored legumes. Previous work has shown that females of this species produce a contact sex pheromone that elicits copulatory behavior in males. Comparisons of copulatory activity between any two of four congeneric species suggest that the contact sex pheromones are species specific. In laboratory bioassays, male C. analis exhibited copulatory behavior to a female dummy to which a crude extract of virgin females was applied. The extract had been collected by a filter paper method and was purified by acid-base partition and chromatographic techniques. Gas chromatography-mass spectrometry (GC-MS) analyses of active fractions revealed that the active compounds were 2,6-dimethyloctane-1,8-dioic acid (1) and callosobruchusic acid, (E)-3,7-dimethyl-2-octene-1,8-dioic acid (2), previously identified as contact sex pheromones of Callosobruchus maculatus (F.) and C. chinensis (L.), respectively. The stereoisomeric and chemical compositions were determined by the 2D-HPLC-Ohrui-Akasaka method as (2S,6R)-1:(S)-2=1.8:1, which meant that both compounds in C. analis were stereochemically pure, unlike the case of C. maculatus and C. chinensis. An examination of the influence of synthetic pheromone compounds on male copulatory activity revealed that (2S,6R)-1 is the main component, and that (S)-2 has an additive effect. In the examination of the stereochemistry-activity relationship, no copulatory behavior was elicited by (2R,6S)-1, and, furthermore, the enantiomer significantly masked the pheromonal activity of (2S,6R)-1. Glass rod dummy assays also suggested the presence of synergists. These results could elucidate the specificity of mate recognition in C. analis" |
| Keywords: | "Animals Coleoptera/*chemistry/*drug effects Female Gas Chromatography-Mass Spectrometry Hydrogen-Ion Concentration Male Sex Attractants/*analysis/chemistry/isolation & purification/*pharmacology Sexual Behavior, Animal/drug effects;" |
| Notes: | "MedlineShimomura, Kenji Akasaka, Kazuaki Yajima, Arata Mimura, Takanori Yajima, Shunsuke Ohsawa, Kanju eng 2010/08/11 J Chem Ecol. 2010 Sep; 36(9):955-65. doi: 10.1007/s10886-010-9841-z. Epub 2010 Aug 10" |
