Diapause-dependent changes in prothoracicotropic hormone-producing neurons of the tobacco hornworm, Manduca sexta

1994 ◽  
Vol 277 (1) ◽  
pp. 69-78
Author(s):  
Klaus Hartfelder ◽  
Wilma K. Hanton ◽  
Walter E. Bollenbacher
1994 ◽  
Vol 277 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Klaus Hartfelder ◽  
Wilma K. Hanton ◽  
Walter E. Bollenbacher

1974 ◽  
Vol 61 (2) ◽  
pp. 493-501 ◽  
Author(s):  
H. FREDERIK NIJHOUT ◽  
CARROLL M. WILLIAMS

During the final larval instar of the tobacco hornworm the presence of juvenile hormone (JH) inhibits the secretion of the brain's prothoracicotropic hormone (PTTH). The corpora allata cease to secrete JH when the larvae attain a weight of approximately 5 g. The JH is cleared from the haemolymph in about 24 h. This process in itself renders the brain competent to release PTTH. The actual release of PTTH occurs at the very first photo-periodic gate after the JH has disappeared from the haemolymph. A functional failure of this normal mechanism is apparently responsible for the developmental standstill of Lepidoptera which diapause as mature larvae.


Peptides ◽  
1994 ◽  
Vol 15 (5) ◽  
pp. 777-782 ◽  
Author(s):  
Rosemary S. Gray ◽  
David P. Muehleisen ◽  
Eva J. Katahira ◽  
Walter E. Bollenbacher

1980 ◽  
Vol 158 (1) ◽  
pp. 141-153 ◽  
Author(s):  
LOUIS SAFRANEK ◽  
CARROLL M. WILLIAMS

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