Plastic and evolutionary responses of cell size and number to larval malnutrition in Drosophila melanogaster.

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_42E7E8596B08
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Plastic and evolutionary responses of cell size and number to larval malnutrition in Drosophila melanogaster.
Périodique
Journal of Evolutionary Biology
Auteur(s)
Vijendravarma R.K., Narasimha S., Kawecki T.J.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
24
Numéro
4
Pages
897-903
Langue
anglais
Résumé
Both development and evolution under chronic malnutrition lead to reduced adult size in Drosophila. We studied the contribution of changes in size vs. number of epidermal cells to plastic and evolutionary reduction of wing size in response to poor larval food. We used flies from six populations selected for tolerance to larval malnutrition and from six unselected control populations, raised either under standard conditions or under larval malnutrition. In the control populations, phenotypic plasticity of wing size was mediated by both cell size and cell number. In contrast, evolutionary change in wing size, which was only observed as a correlated response expressed on standard food, was mediated entirely by reduction in cell number. Plasticity of cell number had been lost in the selected populations, and cell number did not differ between the sexes despite males having smaller wings. Results of this and other experimental evolution studies are consistent with the hypothesis that alleles which increase body size through prolonged growth affect wing size mostly via cell number, whereas alleles which increase size through higher growth rate do so via cell size.
Mots-clé
body size, cell number, cell size, experimental evolution, imaginal discs, nutritional stress, plasticity, wing
Pubmed
Web of science
Open Access
Oui
Création de la notice
22/03/2011 19:39
Dernière modification de la notice
20/08/2019 14:45
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