Korb, Judith and Hoffmann, Katharina and Hartfelder, Klaus (2012) Molting dynamics and juvenile hormone titer profiles in the nymphal stages of a lower termite, Cryptotermes secundus (Kalotermitidae) - signatures of developmental plasticity. JOURNAL OF INSECT PHYSIOLOGY, 58 (3). pp. 376-383. ISSN 0022-1910,
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Termites are social cockroaches and this sociality is founded on a high plasticity during development. Three molting types (progressive, stationary and regressive molts) are fundamental to achieve plasticity during alate/sexual development, and they make termites a major challenge to any model on endocrine regulation in insect development. As the endocrine signatures underpinning this plasticity are barely understood, we studied the developmental dynamics and their underlying juvenile hormone OH) titers in a wood-dwelling termite. Cryptotermes secundus, which is characterized by an ancestral life style of living in dead wood and individuals being totipotent in development. The following general pattern elements could be identified during winged sexual development (i) regressive molts were accompanied by longer intermolt periods than other molting types, (ii) JH titers decreased gradually during the developmental transition from larva (immatures without wing buds), to nymph (immatures with wing buds), to winged adult, (iii) in all nymphal stages, the JH titer rose before the next molt and dropped thereafter within the first week, (iv) considerable variation in JH titers occurred in the midphase of the molting cycle of the 2nd and 3rd nymphal instar, inferring that this variation may reflect the underlying endocrine signature of each of the three molting types, (v) the 4th nymphal instar, the shortest of all, seems to be a switch point in development, as nymphs in this stage mainly developed progressively. When comparing these patterns with endocrine signatures seen in cockroaches, the developmental program of Cryprotermes can be interpreted as a co-option and repetitive use of hormonal dynamics of the post dorsal-closure phase of cockroach embryonic development. (C) 2012 Elsevier Ltd. All tights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COCKROACH NAUPHOETA-CINEREA; FORMOSAN SUBTERRANEAN TERMITE; RETICULITERMES-FLAVIPES; COPTOTERMES-FORMOSANUS; ZOOTERMOPSIS-ANGUSTICOLLIS; NEOTENIC REPRODUCTIVES; PHENOTYPIC PLASTICITY; DIPLOPTERA-PUNCTATA; METHYL FARNESOATE; GENE-EXPRESSION; Developmental plasticity; Social insect; Morphogenetic hormone; Hemimetabolous; Molt |
| Subjects: | 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 May 2020 04:59 |
| Last Modified: | 25 May 2020 04:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19127 |
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