Document Detail


Feeding and hemolymph trehalose concentration influence sex pheromone production in virgin Heliothis virescens moths.
MedLine Citation:
PMID:  20540946     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Previously, we demonstrated that sex pheromone production in mated female Heliothis virescens moths is dependent upon hemolymph trehalose concentration (HTC), which is influenced by activities such as the feeding of adults on sucrose. In this paper we demonstrate, for the first time, that this effect also occurs in starved (i.e., sugar-stressed) virgin females. Females allowed to feed on sugar for 6 days, following eclosion, had significantly greater titers than females that had fed only on water (i.e., were starved). No differences in pheromone titer were observed between sugar- and water-fed females at shorter (1 or 3 days) periods following eclosion. The relatively short-term effects of HTC on sex pheromone titer of virgins, were demonstrated by feeding experiments, in which starved (for 4 days) virgins fed on 10% sucrose solution had significantly greater HTC and pheromone titers than ones fed only on water; an increase in HTC was apparent within an hour, while the increase in pheromone titer was apparent within 2.5h, of sugar feeding. Starvation also showed similar effects on titers of pheromone gland fatty acids (pheromone intermediates) and HTC. Over 6 days of starvation, fatty acid titers and HTC declined gradually. After feeding on sucrose, titers of hexadecanoic, (Z)-9-hexadecanoic, (Z)-11-hexadecanoic and (Z)-9-octadecanoic, acids, as well as HTC, increased significantly 24h later, but titers of octadecanoic and (Z,Z)-9,12-octadecanoic (linoleic) acids did not. Lepidoptera cannot biosynthesize polyunsaturated acids, but the lack of change in octadecanoic acid titer suggests this acid may not participate in pheromone biosynthesis. In addition to these short-term changes in pheromone and fatty acid production, mediated by HTC, a longer-term effect of age, regardless of HTC, on pheromone titer was observed. Overall, these results are consistent with hemolymph trehalose and glandular fatty acids acting as twin metabolite reservoirs for pheromone biosynthesis. Hemolymph trehalose, able to be refilled through feeding on exogenous sugars, has a one-way flow of metabolites for synthesis of glandular free fatty acids (FFAs) and pheromone, while glandular glycerolipids provide a reversible reservoir for metabolites, accepting surplus FFAs when glandular concentrations are high, and providing FFAs for pheromone biosynthesis when concentrations are low.
Authors:
Stephen P Foster; Chris P Johnson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-06-16
Journal Detail:
Title:  Journal of insect physiology     Volume:  56     ISSN:  1879-1611     ISO Abbreviation:  J. Insect Physiol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-08-17     Completed Date:  2010-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1617-23     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier Ltd. All rights reserved.
Affiliation:
Entomology Department, North Dakota State University, Fargo, ND 58108-6050, USA. stephen.foster@ndsu.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Fatty Acids / metabolism
Feeding Behavior / physiology*
Female
Hemolymph / chemistry,  metabolism
Moths / physiology*
Sex Attractants / metabolism*
Sexual Behavior, Animal / physiology*
Trehalose / analysis,  metabolism*
Chemical
Reg. No./Substance:
0/Fatty Acids; 0/Sex Attractants; 99-20-7/Trehalose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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