EurekaMag.com logo
+ Translate

Regulation of prothoracic gland activity in diapausing larvae of the wax moth, Galleria mellonella L. (Lepidoptera)


, : Regulation of prothoracic gland activity in diapausing larvae of the wax moth, Galleria mellonella L. (Lepidoptera). Insect Biochemistry and Molecular Biology 23(1): 33-41

The development of Galleria mellonella is arrested by a lowered temperature of 18 degrees C at the stage of the last instar post-spinning larva. The haemolymph ecdysteroid titre of these larvae is maintained at a low level of ca 5 pg of 20-hydroxyecdysone per micro 1. Different types of surgical manipulations including nerve cord-severance, implantation of the brain, prothoracic glands (PGs) or fat body accompanied with ecdysteroid titre measurements show that the low ecdysteroid titre in diapausing larvae is due to nervous inhibition of their PGs. The inhibitory input probably comes from the brain and is transmitted down to the PGs via the suboesophageal ganglion and paired cervical nerves. Severance of the nerve tracts at any level caused rapid activation of PGs of diapausing insects. Nervous inhibition of the PGs ceases about 6-9 b after transfer of diapausing larvae from the lower temperature to the diapause-terminating conditions of 30 degrees C. As long as the PGs are under nervous inhibitory control they are refractory to humoral stimulation. The brains of diapausing larvae exhibit in vitro high prothoracicotropic activity which suggests that PTTH is accumulated in the brain during diapause. The role of juvenile hormone in inhibiting the release of PTTH from the brain to haemolymph, and its effect on the PGs during diapause is discussed.

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 002477246

DOI: 10.1016/0965-1748(93)90079-8

Download PDF Full Text: Regulation of prothoracic gland activity in diapausing larvae of the wax moth, Galleria mellonella L. (Lepidoptera)


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

D.S.nto, J.P.; Radtke, F.; Rodewald, H.R., 2000: To be or not to be a pro-T?. Recent studies have begun to unravel some of the molecular pathways that appear to control the processes of T cell determination in the earliest thymocyte precursors. In addition, the analyses of mouse mutants with an entirely alymphoid thymus hav...

Storgards, T., 1955: Bacteriological aspects of the manufacture of ice cream.. This review covers sources of infection, pasteurization and hygienic measures, and methods for bacteriological control.

TETZLAFF, F., 1949: Malaria control progress and problems. Journal. National Malaria Society 8(2): 115-120

Schechter, D.S.; Zygmunt, A.; Coates, S.W.; Davies, M.; Trabka, K.; McCaw, J.; Kolodji, A.; Robinson, J., 2007: Caregiver traumatization adversely impacts young children's mental representations on the MacArthur Story Stem Battery. The aim of our study was to investigate the impact of maternal exposure to family violence, maltreatment, and related posttraumatic stress disorder (PTSD) on young children's mental representations of self and caregivers. Participant mothers...

Kosheleva N.G., 1969: Effect of progesterone vitamin e and sigetine on experimentally induced embryogenetic disorders rabbit rat. Akusherstvo i Ginekologiya (Moscow) 45(4): 32-37

Morrey, C., 1980: Migration assumptions for the 1979 based sub-national population projections. The author reports on the internal migration assumptions that will be used in the official 1979-based sub-national population projections in England and compares the assumptions with those adopted in the 1977-based projections

Olivieri, L.; Arling, B.; Friberg, M.; Sable, C., 2009: Coronary artery Z score regression equations and calculators derived from a large heterogeneous population of children undergoing echocardiography. Clinical decision making in Kawasaki disease relies on measurements of the coronary arteries obtained by 2-dimensional echocardiography. Z scores relating measured values to independent variables are invaluable in ensuring the accurate and consist...

Verduyn Launel, A.A., 1965: The localization of the atrioventricular conduction system in tetralogy of Fallot and the ostium atrioventricular commune. Nederlands Tijdschrift Voor Geneeskunde 109(30): 1419-1419

Jones, T.; Gibson, I.A.S.; Smith, W.E., 1966: Deterioration of timber in use in East Africa and its prevention. Part I. The causes of timber deterioration in East Africa. Part II. Timber preservation in East Africa. A review of the insects, marine borers, and fungi known to attack E. African timbers, with a summary of the methods available for protecting timber.

Lumpkin, R.; Özgökmen, T.; Centurioni, L., 2016: Advances in the Application of Surface Drifters. NlmCategory="UNASSIGNED">Surface drifting buoys, or drifters, are used in oceanographic and climate research, oil spill tracking, weather forecasting, search and rescue operations, calibration and validation of velocities from high-fr...