The role of eclosion hormone in the larval ecdyses of Manduca sexta

Philip Copenhaver, James W. Truman

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Each larval moult in Manduca sexta consists of an identical series of developmental and behavioural events leading up to ecdysis. Injections of eclosion hormone into staged larvae in any instar resulted in the premature elicitation of the larval pre-ecdysis behaviour, comprising a rhythmic sequence of muscle contractions, followed by the larval ecdysis behaviour. A marked depletion of eclosion hormone stores form the ventral chain of ganglia coincided with each larval ecdysis and in the moult to the fifth instar, eclosion hormone activity appeared in the blood at the onset of the pre-ecdysis behaviour. Responsiveness to eclosion hormone for pre-ecdysis and ecdysis behaviour developed about 12 and 6 hr before normal ecdysis, respectively. Elicitation of ecdysis behaviour by exogenous hormone inhibited both subsequent behavioural responses to eclosion hormone and endogenous hormonal release. In conclusion, the behavioural programme involved in each larval ecdysis appears to be controlled by the eclosion hormone.

Original languageEnglish (US)
Pages (from-to)695-701
Number of pages7
JournalJournal of Insect Physiology
Volume28
Issue number8
DOIs
StatePublished - 1982
Externally publishedYes

Fingerprint

eclosion hormone
Manduca
Molting
ecdysis
Manduca sexta
molting
instars
muscle contraction
Muscle Contraction
Ganglia
Larva

Keywords

  • ecdysis
  • eclosion hormone
  • Larval moult
  • Manduca sexta
  • pre-ecdysis behaviour

ASJC Scopus subject areas

  • Insect Science
  • Physiology

Cite this

The role of eclosion hormone in the larval ecdyses of Manduca sexta. / Copenhaver, Philip; Truman, James W.

In: Journal of Insect Physiology, Vol. 28, No. 8, 1982, p. 695-701.

Research output: Contribution to journalArticle

@article{95d867b6004a40f3b9b2a7f6796a5581,
title = "The role of eclosion hormone in the larval ecdyses of Manduca sexta",
abstract = "Each larval moult in Manduca sexta consists of an identical series of developmental and behavioural events leading up to ecdysis. Injections of eclosion hormone into staged larvae in any instar resulted in the premature elicitation of the larval pre-ecdysis behaviour, comprising a rhythmic sequence of muscle contractions, followed by the larval ecdysis behaviour. A marked depletion of eclosion hormone stores form the ventral chain of ganglia coincided with each larval ecdysis and in the moult to the fifth instar, eclosion hormone activity appeared in the blood at the onset of the pre-ecdysis behaviour. Responsiveness to eclosion hormone for pre-ecdysis and ecdysis behaviour developed about 12 and 6 hr before normal ecdysis, respectively. Elicitation of ecdysis behaviour by exogenous hormone inhibited both subsequent behavioural responses to eclosion hormone and endogenous hormonal release. In conclusion, the behavioural programme involved in each larval ecdysis appears to be controlled by the eclosion hormone.",
keywords = "ecdysis, eclosion hormone, Larval moult, Manduca sexta, pre-ecdysis behaviour",
author = "Philip Copenhaver and Truman, {James W.}",
year = "1982",
doi = "10.1016/0022-1910(82)90148-2",
language = "English (US)",
volume = "28",
pages = "695--701",
journal = "Journal of Insect Physiology",
issn = "0022-1910",
publisher = "Elsevier Limited",
number = "8",

}

TY - JOUR

T1 - The role of eclosion hormone in the larval ecdyses of Manduca sexta

AU - Copenhaver, Philip

AU - Truman, James W.

PY - 1982

Y1 - 1982

N2 - Each larval moult in Manduca sexta consists of an identical series of developmental and behavioural events leading up to ecdysis. Injections of eclosion hormone into staged larvae in any instar resulted in the premature elicitation of the larval pre-ecdysis behaviour, comprising a rhythmic sequence of muscle contractions, followed by the larval ecdysis behaviour. A marked depletion of eclosion hormone stores form the ventral chain of ganglia coincided with each larval ecdysis and in the moult to the fifth instar, eclosion hormone activity appeared in the blood at the onset of the pre-ecdysis behaviour. Responsiveness to eclosion hormone for pre-ecdysis and ecdysis behaviour developed about 12 and 6 hr before normal ecdysis, respectively. Elicitation of ecdysis behaviour by exogenous hormone inhibited both subsequent behavioural responses to eclosion hormone and endogenous hormonal release. In conclusion, the behavioural programme involved in each larval ecdysis appears to be controlled by the eclosion hormone.

AB - Each larval moult in Manduca sexta consists of an identical series of developmental and behavioural events leading up to ecdysis. Injections of eclosion hormone into staged larvae in any instar resulted in the premature elicitation of the larval pre-ecdysis behaviour, comprising a rhythmic sequence of muscle contractions, followed by the larval ecdysis behaviour. A marked depletion of eclosion hormone stores form the ventral chain of ganglia coincided with each larval ecdysis and in the moult to the fifth instar, eclosion hormone activity appeared in the blood at the onset of the pre-ecdysis behaviour. Responsiveness to eclosion hormone for pre-ecdysis and ecdysis behaviour developed about 12 and 6 hr before normal ecdysis, respectively. Elicitation of ecdysis behaviour by exogenous hormone inhibited both subsequent behavioural responses to eclosion hormone and endogenous hormonal release. In conclusion, the behavioural programme involved in each larval ecdysis appears to be controlled by the eclosion hormone.

KW - ecdysis

KW - eclosion hormone

KW - Larval moult

KW - Manduca sexta

KW - pre-ecdysis behaviour

UR - http://www.scopus.com/inward/record.url?scp=0000164029&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000164029&partnerID=8YFLogxK

U2 - 10.1016/0022-1910(82)90148-2

DO - 10.1016/0022-1910(82)90148-2

M3 - Article

AN - SCOPUS:0000164029

VL - 28

SP - 695

EP - 701

JO - Journal of Insect Physiology

JF - Journal of Insect Physiology

SN - 0022-1910

IS - 8

ER -