Drosophila sugar response is increased by starvation duration and sucrose concentration in a locomotion-independent proboscis extension test

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urn:nbn:de:bvb:355-epub-315322 Copy

Damrau, Christine ; Brembs, Björn ; Colomb, Julien

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Date of publication of this fulltext: 27 Mar 2015 12:42

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Details

Item type:	Image
Date:	5 September 2014
Institutions:	Biology, Preclinical Medicine > Institut für Zoologie > Neurogenetik (Prof. Dr. Björn Brembs)
Identification Number:	Value Type 10.6084/m9.figshare.1162437 DOI
Keywords:	Drosophila, proboscis-extension, starvation, method, sucrose preference test
Dewey Decimal Classification:	500 Science > 570 Life sciences 500 Science > 590 Zoological sciences
Status:	Published
Refereed:	Unknown
Created at the University of Regensburg:	Unknown
Item ID:	31532

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Abstract

A. Proboscis extension response assay. One to two days old CantonS flies of mixed gender were starved for the indicated time with ad libitum access to water. Four hours before testing, they were glued to a copper hook between head and thorax. For the test, the hook was fixed to clamp which was attached to a rack. In this locomotion-independent assay, all tarsi can be stimulated with no stress or ...

Abstract

A. Proboscis extension response assay. One to two days old CantonS flies of mixed gender were starved for the indicated time with ad libitum access to water. Four hours before testing, they were glued to a copper hook between head and thorax. For the test, the hook was fixed to clamp which was attached to a rack. In this locomotion-independent assay, all tarsi can be stimulated with no stress or pressure on abdomen by a serial dilution of seven increasing sucrose concentrations (0%, 0.1%, 0.3%, 0.6%, 1%, 3%, 10%, 30%, 30% to labellum).

B. The proportion of flies that extended proboscis after being stimulated at all the tarsi. Flies either responding to the first (water) or not responding to the last 30% to the labellum were excluded from the data analysis. The proportion of responding flies increases not only with increasing sucrose concentration but also with increasing starvation time of 21 hours compared to 14 hours.

C. The response index is significantly higher after 21 hours compared to 14 hours of starvation indicated by asterisk (Wilcoxon rank sum test, p < 0.05) and was calculated by summing the positive proboscis extension responses to all the seven stimulations and are illustrated as medians (bar), the 75%- and 25%-quartiles (box) and the total data range (whiskers). Numbers inside the boxes indicate sample sizes.

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Metadata last modified: 02 Jun 2018 05:13

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