Temporal correlation between ecdysteroids and mitotic activity in larval tissues of Clitumnus extradentatus (Phasmoptera: Phasmatidae: Lonchodinae)

Title:

Temporal correlation between ecdysteroids and mitotic activity in larval tissues of Clitumnus extradentatus (Phasmoptera: Phasmatidae: Lonchodinae)

Creator:

Sauve-Guillaume, Madeleine, Porcheron, Patrick, and Lauge, Ginette

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:dcff73c9-e21f-4418-b67d-208ac27b523e
uuid:dcff73c9-e21f-4418-b67d-208ac27b523e

Subject:

Phasmoptera, moult cycle, mitosis, ecdysteroids, epidermis, fat body, midgut, and mandibles

Type:

article, model:article, and TEXT

Description:

A comparative study of mitotic activities and haemolymph ecdysteroid levels was performed in the phasmid Clitumnus extradentatus. Temporal correlation was found between increases in mitotic frequency in mandibular and general epidermis, and variations of ecdysteroid levels in the haemolymph of the insects. Whereas, mitotic waves occurring in the fat body cells or in the basal cells of the midgut did not appear to be strictly correlated with these hormonal variations. During the fourth larval instar of this phasma; an accurate study of mitotic figures, monitored from histological sections, indicated a time-lag in their stimulation according to the studied area, with a peak on day 2 in the mandible tips, on day 5 in the mandible bases and on day 7 in the head capsule, thorax and abdomen epidermis: namely a five-day delay with respect to the 12 days of the fourth instar. Simultaneously, the evolution of ecdysteroid levels in the haemolymph showed three increases of different importance. Each hormonal increase occurred 24 h before the triggering of each increase in the mitotic activity, whereas a fourth and very high peak, occurring on day 8, corresponded to the sudden fall in the number of epidermal mitoses.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 1998 Volume:95 | Number:4

Harvested from:

CDK

Metadata only:

false