The role of leaf lipids in food selection by larvae of the tobacco hornworm,Manduca sexta

1988 ◽  
Vol 14 (2) ◽  
pp. 669-682 ◽  
Author(s):  
Gerrit de Boer ◽  
Frank E. Hanson
Keyword(s):  
Manduca Sexta ◽  
Food Selection ◽  
Tobacco Hornworm

The role of destruxins in the pathogenicity of 3 strains of Metarhizium anisopliae for the tobacco hornworm Manduca sexta

1988 ◽  
Vol 104 (1) ◽  
pp. 51-58 ◽  
Author(s):  
R. I. Samuels ◽  
A. K. Charnley ◽  
S. E. Reynolds
Keyword(s):  
Manduca Sexta ◽  
Metarhizium Anisopliae ◽  
Tobacco Hornworm

Teaching Principles of Endocrinology Using the Tobacco Hornworm

2017 ◽  
Vol 79 (7) ◽  
pp. 584-589 ◽  
Author(s):  
John M. Rowland ◽  
Ian J. Rowland ◽  
Walter G. Goodman
Keyword(s):  
Laboratory Experiment ◽  
Animal Welfare ◽  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Insect Development ◽  
Excellent Model ◽  
Teaching Principles

Insects provide an excellent model for examining concepts in endocrinology in the classroom. They are relatively inexpensive to rear, short-lived, and free from animal welfare regulations. Using the tobacco hornworm (Manduca sexta) as a model, we have developed a simple laboratory experiment to demonstrate the role of hormones in development. In this experiment, students will use a readily available agonist to disrupt insect development, preventing metamorphosis. This exercise fits well into the AP lab curriculum and the NGSS LSB.1 objectives.

scholarly journals Hormonally mediated reprogramming of muscles and motoneurones during the larval-pupal transformation of the tobacco hornworm, Manduca sexta

1986 ◽  
Vol 125 (1) ◽  
pp. 1-13 ◽  
Author(s):  
J. C. Weeks ◽  
J. W. Truman
Keyword(s):  
Juvenile Hormone ◽  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Abdominal Muscles ◽  
Pupal Development ◽  
Qualitative And Quantitative ◽  
Pulse Exposure ◽  
Quantitative Changes

The larval-pupal transformation of Manduca sexta results from an exposure to ecdysteroids in the absence of juvenile hormone (the commitment pulse), followed by a larger exposure to ecdysteroids (the prepupal peak) with a reappearance of juvenile hormone (JH). The prepupal ecdysteroid peak triggers the degeneration of abdominal muscles, and the dendritic regression and death of identified motoneurones. The present experiments examined the role of the commitment pulse in the larval-pupal reprogramming of these cells. The commitment pulse did not overtly affect the muscles and motoneurones, but it switched their hormonal responsiveness; before the commitment pulse, exposure to ecdysteroids in the presence of JH had no effect on the larval cells, whereas after the commitment pulse the same treatment caused regression and death. Thus, JH lost its ability to prevent pupal development. Furthermore, treatment with ecdysteroids in the absence of JH before the commitment pulse promoted pupal development much less effectively than did the same treatment given after the commitment pulse, indicating that the commitment pulse facilitates the subsequent responsiveness to ecdysteroids. Thus, the commitment pulse covertly causes both qualitative and quantitative changes in the hormonal sensitivity of the larval muscles and motoneurones.

Role of β-alanine in pupal cuticle coloration in the tobacco hornworm, Manduca sexta

1987 ◽  
Vol 17 (3) ◽  
pp. 389-399 ◽  
Author(s):  
István Ujváry ◽  
Kiyoshi Hiruma ◽  
Lynn M. Riddiford ◽  
Gyorgy Matolcsy ◽  
Craig R. Roseland ◽  
...  
Keyword(s):  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Pupal Cuticle
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