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- Title
Development of the adult leg epidermis inManduca sexta: contribution of different larval cell populations.
- Authors
Tanaka, Kohtaro; Truman, James
- Abstract
During metamorphosis of the tobacco hornwormManduca sexta, the simple thoracic legs of the larva are remodeled into the more complex adult legs. Most of the adult leg epidermis derives from the adult primordia, small sets of epidermal cells located in specific regions of the larval leg, which proliferate rapidly in the final larval instar. In contrast, the contribution of the epidermal cells outside the primordia is unknown. In this study we have determined their contribution to the adult leg by labeling them with 5-bromodeoxyuridine (BUdR) and following their fate. Although the labeled cells diminished drastically in number, small groups of these cells persisted into the midpupal stage suggesting that they do contribute to the adult leg epidermis. We also found that during the wandering stage the adult primordia went through active proliferation and very little cell death, while the cells outside the primordia went through extensive cell death accounting for the decrease in their number. Our results indicate that two distinct cell populations exist outside the adult primordia. Most cells belong to the first population, which is larval-specific and disappears through apoptosis early in metamorphosis. The second population consists of polymorphic cells that contribute to the larval, pupal and adult leg epidermis.
- Subjects
LEPIDOPTERA; EPIDERMIS; MANDUCA; METAMORPHOSIS; DEVELOPMENTAL biology
- Publication
Development Genes & Evolution, 2005, Vol 215, Issue 2, p78
- ISSN
0949-944X
- Publication type
Article
- DOI
10.1007/s00427-004-0458-5