Alpha-acaridial a female sex pheromone from an alarm pheromone emilting mite Rhizoglyphus robini |
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Authors: | Mizoguchi Atsuko Mori Naoki Nishida Ritsuo Kuwahara Yasumasa |
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Affiliation: | (1) Laboratory of Chemical Ecology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan |
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Abstract: | The female sex pheromone of Rhizoglyphus robini Claparède (Astigmata: Acaridae) was identified as -acaridial [2(E)-(4-methyl-3-pentenyl)- butenedial], which stimulated males sexually and enhanced the frequency of male mounting behavior. Although a hexane extract of females manifested alarm pheromone activity against tested males due to the presence of the alarm pheromone neryl formate, silica gel column fractions containing -acaridial evoked increased mounting behavior by males at a dose of 0.1 female equivalent. Synthetic -acaridial at a dose of 10 ng showed a peak of activity as a sex pheromone, with a convex dose–response relationship. Its content was determined to be 388 ± 244 ng per female and 163 ± 97 ng per male by GC. This is the first time that two pheromones (the alarm pheromone neryl formate, and the sex pheromone -acaridial) have been demonstrated to be components of the same opisthonotal gland secretion in astigmatid mites. A mechanism for the appropriate expression of the two pheromones by the mites under different conditions is proposed. |
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Keywords: | /content/n3p63311u7734227/xxlarge945.gif" alt=" agr" align=" BASELINE" BORDER=" 0" >-acaridial sex pheromone neryl formate alarm pheromone Rhizoglyphus robini opisthonotal gland mite |
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