Nov 8, 2018

Evolution of ovipositor length in Drosophila suzukii is driven by enhanced cell size expansion and anisotropic tissue reorganization

BioRxiv : the Preprint Server for Biology
Jack E GreenBenjamin Prud'homme

Abstract

Morphological diversity is dominated by variation in body proportion. Yet the cellular processes underlying differential growth of morphological traits between species remain largely unknown. Here we compare the ovipositors of two closely related species, Drosophila melanogaster and D. suzukii. D. suzukii has switched its egg laying niche from rotting to ripe fruit. Along with this shift, the D. suzukii ovipositor has undergone a significant change in size and shape. Using an allometric approach we find that, while adult ovipositor width has hardly changed between the species, D. suzukii ovipositor length is almost double that of D. melanogaster. We show that this size difference mostly arises during a 6 hour time window in the middle of pupal development. We observe that the developing ovipositors of the two species comprise an almost identical number of cells, with a very similar profile of cell shapes and orientations. After cell division stops, we find that the ovipositor area continues to grow through the isotropic expansion of cell apical area. Remarkably, at one point, the rate of cell apical area expansion is more than 4 times faster in D. suzukii than in D. melanogaster. In addition, we find that an anisotropic cellula...Continue Reading

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Mentioned in this Paper

Size
Developmental Growth Involved in Morphogenesis
Cellular Process
Diphyscium suzukii
Cell Division
Cytoskeletal Modeling
Morphological
Cell Growth
Apical
Isotropic Cell Growth

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