Effects of a juvenile hormone analogue on the duration of the fifth instar in the milkweed bug Oncopeltus fasciatus
Topical application of JHA to fifth instar nymphs of Oncopeltus fasciatus, immediately following ecdysis from the fourth instar, decreases the duration of the fifth instar by approximately 36 hr in addition to inducing a supernumerary larval moult. JHA appears to accelerate the time of subsequent ecdysis in two ways: first, the onset of ecdysone secretion is accelerated, and is accompanied by a similarly premature initiation of mitotic activity in epidermal cells. This is the classical prothoracicotropic action of JH. Second, the period between the onset of mitotic activity and the time of ecdysis itself is shortened. That is, once cellular activities associated with the moulting cycle are triggered by ecdysone, such activities are completed more rapidly in the presence of JHA. It appears that the larval-larval moult induced by JHA requires intrinsically less time to accomplish than a normal metamorphic moult. © 1981.
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Related Subject Headings
- Entomology
- 3208 Medical physiology
- 3109 Zoology
- 0608 Zoology
- 0606 Physiology
- 0604 Genetics
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Entomology
- 3208 Medical physiology
- 3109 Zoology
- 0608 Zoology
- 0606 Physiology
- 0604 Genetics