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Bull Entomol Res

Title:		Age-dependent changes in the ratio of (R)- and (S)-2-butanol released by virgin females of Dasylepida ishigakiensis (Coleoptera: Scarabaeidae)
Author(s):		Fujiwara-Tsujii N; Yasui H; Wakamura S; Mochizuki F; Arakaki N;
Address:		"Laboratory of Insect Interaction Research, National Institute of Agrobiological Sciences, Ohwashi, Tsukuba, Ibaraki, Japan. naoki99@affrc.go.jp"
Journal Title:		Bull Entomol Res
Year:		2012
Volume:		102
Issue:		6
Page Number:		730 - 736
DOI:		10.1017/S0007485312000363
ISSN/ISBN:		1475-2670 (Electronic) 0007-4853 (Linking)
Abstract:		"The females of the white grub beetle, Dasylepida ishigakiensis, release two enantiomers of 2-butanol, (R)-2-butanol and (S)-2-butanol. The ratio describing the relative proportions of these two enantiomers (R/S ratio) has not yet been investigated. (R)-2-Butanol has been shown to attract males in laboratory and field experiments, whereas (S)-2-butanol tends to inhibit them. To determine the R/S ratio of the 2-butanol emitted by virgin females, we collected 2-butanol from young (53 days old), mature (63 days old) and old females (73 days old) using water, extracted with an SPME fibre and subsequently injected into GC-MS. The major component of the 2-butanol emitted by the young females was (R)-2-butanol, but as the females aged, the component ratio favoured (S)-2-butanol. Young females released an 80:20 mixture of (R)- and (S)-2-butanol, whereas old females released a 45:55 mixture. The EAG response of male antennae to a 50:50 ratio (racemic mixture) showed a similar dose-response curve to that of (R)-2-butanol. The male orientation responses to (R)-2-butanol decreased when the relative proportion of (S)-2-butanol increased. An inhibitory and/or masking effect of (S)-2-butanol on male orientation behaviour was also observed in the flight tunnel assay. These results suggest that males are more strongly attracted to young females than to old females. We also discuss the possibility of using 2-butanol isomers as a control or monitoring agent for this insect"
Keywords:		Aging/*physiology Animals Arthropod Antennae/physiology Butanols/*analysis Coleoptera/chemistry/*physiology Female Insect Control Male Sex Attractants/*chemistry Stereoisomerism;
Notes:		"MedlineFujiwara-Tsujii, N Yasui, H Wakamura, S Mochizuki, F Arakaki, N eng Research Support, Non-U.S. Gov't England 2012/11/14 Bull Entomol Res. 2012 Dec; 102(6):730-6. doi: 10.1017/S0007485312000363"