The Breakdown of the Thoracic Gland in the Adult Insect, Rhodnius Prolixus

1955 ◽  
Vol 32 (3) ◽  
pp. 485-491
Author(s):  
V. B. WIGGLESWORTH
Keyword(s):  
Juvenile Hormone ◽  
Adult Stage ◽  
Rhodnius Prolixus ◽  
Adult Insect ◽  
Two Factors ◽  
Humoral Action

The thoracic gland in Rhodnius breaks down and disappears within 48 hr. after the moult to the adult stage. Two factors are involved: (i) The gland suffers some change as the result of going through a moulting stage in the absence of the juvenile hormone. (ii) It must then be exposed to some humoral action at the time of the adult moult. The source and nature of the stimulus which operates at the time of the final ecdysis are not known. But when the gland has been exposed to these two changes it will rapidly break down even in an environment containing the juvenile hormone.

Two actions of juvenile hormone on the follicle cells of Rhodnius prolixus Stål

1975 ◽  
Vol 53 (8) ◽  
pp. 1187-1188 ◽  
Author(s):  
Randa Abu-Hakima ◽  
K. G. Davey
Keyword(s):  
Juvenile Hormone ◽  
Developmental Stages ◽  
Normal Animal ◽  
Rhodnius Prolixus ◽  
Follicle Cells ◽  
Follicular Epithelium ◽  
Intercellular Spaces

The follicular epithelium of vitellogenic oocytes from allatectomized females of Rhodnius fails to develop large intercellular spaces when exposed to juvenile hormone (JH) in vitro. This suggests that in the normal animal, the follicle cells require JH at two developmental stages. Differentiation of the cells in the presence of JH represents one requirement, and only those cells which have undergone this initial priming are fully competent to exhibit the second response, the development of intercellular spaces.

scholarly journals Specific requirement of putrescine for the mitogenic action of juvenile hormone on adult insect neuroblasts

1997 ◽  
Vol 94 (15) ◽  
pp. 8238-8242 ◽  
Author(s):  
M. Cayre ◽  
C. Strambi ◽  
P. Charpin ◽  
R. Augier ◽  
A. Strambi
Keyword(s):  
Juvenile Hormone ◽  
Specific Requirement ◽  
Mitogenic Action ◽  
Adult Insect

scholarly journals Structure Determination of Juvenile Hormone from Chagas Disease Vectors, Rhodnius prolixus and Triatoma infestans

2020 ◽  
Vol 49 (5) ◽  
pp. 538-541
Author(s):  
Keiji Matsumoto ◽  
Yoko Yasuno ◽  
Kohei Yasuda ◽  
Tsuyoshi Hayashi ◽  
Shin G. Goto ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Chagas Disease ◽  
Structure Determination ◽  
Rhodnius Prolixus ◽  
Triatoma Infestans ◽  
Disease Vectors ◽  
Chagas Disease Vectors

A comparison of the juvenilizing effect of six juvenile hormone-like activity compounds on Egyptian Culex pipiens L.

1980 ◽  
Vol 95 (1) ◽  
pp. 203-212 ◽  
Author(s):  
N. L. Kelada ◽  
I. A. Gaaboub ◽  
I. A. Rawash
Keyword(s):  
Sex Ratio ◽  
Juvenile Hormone ◽  
Culex Pipiens ◽  
Adult Stage ◽  
Adult Emergence ◽  
Time Lapse ◽  
Fourth Instar ◽  
Gonotrophic Cycle ◽  
Juvenilizing Effect

SummaryTests were made to determine the juvenilizing effects of TH6040, JH-25, Altosid, Altozar, ZR-777 and ZR-619 on Culex pipiens L. using the IC50 value (dose to inhibit the emergence of 50% of adults) as a criterion. The descending order of activity was Altosid, TH6040, Altozar, ZR-777, JH-25 and ZR·619. Insignificant prolongations were recorded in the larval or pupal durations except in the case of TH6040 (Dimilin). The time lapse from larval treatment (early fourth instar) to adult emergence was prolonged by about 18·7% following treatment with 0·0001–0·1 μg/ml.Juvenilizing effects of the tested compounds applied to the early fourth instar extended to the adult stage of Culex pipiens L. and affected the duration of the first gonotrophic cycle. The concentrations of TH6040, JH-25, Altosid, Altozar, ZR-777 and ZR-619 tested caused prolongation of the time between emergence and first oviposition by about 20–50% (at 0·0001–0·1 μg/ml), 3–26% (at 0·001–5μg/ml), 0–15% (at 0·1 × 10-8–0·001 μg/ml), 3-–23% (at 0·1 × 10-8–0·001 μg/ml), 9–27% (at 0·1 × 10-7–0·01 μg/ml), and 11–32% (at 0·1 × 10-7–0·01 μg/ml), respectively.The results obtained indicated that the sex ratio of C. pipiensL. changed progressively in all treatments but with an inconsistent trend according to the concentration of each compound. This conclusion provides further evidence on the effect of juvenile hormone-like activity compounds on adults emerging from treated larvae. The numbers of females produced were increased by about 15–30%, 9–27%, 1–35%, 1–38%, 6–44% and 31–71% after treatment with 0·0001–0·1 μg TH6040, 0·001–5μg JH-25, 0·1x 10-8–0·001 μg Altosid, 0·1 x 10-8–0·001 μg Altozar, 0·1 x lO-7–O·Ol μg ZR-777 and 0·01 × 10-7–0·01 μg ZR-619‘sol;ml, respectively.

The effect of a juvenile hormone mimic on development of the metathoracic release site of the Brindley's glands of Rhodnius prolixus

1981 ◽  
Vol 59 (5) ◽  
pp. 850-857 ◽  
Author(s):  
F. Michael Barrett
Keyword(s):  
Juvenile Hormone ◽  
Critical Period ◽  
Morphological Characteristics ◽  
Release Site ◽  
Rhodnius Prolixus ◽  
Site Development ◽  
Juvenile Hormone Mimic ◽  
Emerging Insects

The development of the metathoracic release site of Brindley's glands in adult Rhodnius prolixus has been investigated by treating larvae with juvenile hormone (JH) mimic at different times during the last instar and observing the extent of development in this region in the subsequently emerging insects. The results demonstrate a critical period of JH mimic sensitivity for release-site development comparable to that previously established for other adult morphological characteristics.

The Functions of the Corpus Allatum in Rhodnius Prolixus (Hemiptera)

1948 ◽  
Vol 25 (1) ◽  
pp. 1-15
Author(s):  
V. B. WIGGLESWORTH
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Juvenile Hormone ◽  
Adult Female ◽  
Corpus Allatum ◽  
Relative Importance ◽  
Egg Development ◽  
Mature Adult ◽  
Two Factors ◽  
The Central Nervous System

Two factors are involved in the control of metamorphosis in Rhodnius: (a) The corpus allatum of the 5th-stage nymph no longer secretes the juvenile hormone (inhibitory hormone). The latent imaginal characters can thus be realized. (b) The corpus allatum in the 5th-stage nymph, particularly in the later stages of moulting, actively favours the production of imaginal characters. The evidence suggests that this activity (b) consists, not in the secretion of a metamorphosis promoting hormone favouring adult differentiation in the tissues directly, but in the elimination of the small quantities of juvenile hormone persisting in the blood and tissues. If we suppose that these two factors differ in relative importance in different insects we may perhaps have the basis for a theory of metamorphosis applicable to all groups of insects. The corpus allatum of the mature adult Rhodnius again begins to secrete the juvenile hormone; and the juvenile hormone of the 4th-stage nymph will induce egg development in the adult female. It is probable that the yolk-forming hormone and the juvenile hormone are identical. The sequence in the secretory activities of the corpus allatum, and so the number of instars, is controlled by some other centre, perhaps in the central nervous system.

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