scholarly journals Effect of Larval Topical Application of Juvenile Hormone on Caste Determination in the Independent-Founding Eusocial Wasp <i>Mischocyttarus consimilis</i> (Hymenoptera: Vespidae)

2015 ◽  
Vol 05 (02) ◽  
pp. 174-184 ◽  
Author(s):  
Thiago S. Montagna ◽  
Josué Raizer ◽  
William F. Antonialli-Junior
Keyword(s):  
Juvenile Hormone ◽  
Topical Application ◽  
Caste Determination ◽  
Eusocial Wasp

scholarly journals Effect of Larval Topical Application of Juvenile Hormone on Cuticular Chemical Composition of Mischocyttarus consimilis (Vespidae: Polistinae) Females

Sociobiology ◽  
2020 ◽  
Vol 67 (3) ◽  
pp. 433
Author(s):  
Erika Fernandes Neves ◽  
Thiago Santos Montagna ◽  
Luiz Carlos Santos Junior ◽  
Kamylla Balbuena Michelutti ◽  
Claudia Andrea Lima Cardoso ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Juvenile Hormone ◽  
Topical Application ◽  
Larval Instar ◽  
Social Wasps ◽  
Caste Determination ◽  
Chemical Profile ◽  
Main Determinant ◽  
Adult Females ◽  
Infrared Photoacoustic Spectroscopy

Juvenile  Hormone  (JH)  is  considered  the  main  determinant  of  caste  in  social insects, though little is known about how this hormone acts in social wasps, especially the independent-founding species. The known relationship between JH titer and caste in the colony and we suggest a relationship among the effects of JH and the cuticular chemical profile. Therefore, this study aimed to test the hypothesis that topical application of JH to larvae of different instars alters the cuticular chemical composition of newly emerged females of Mischocyttarus consimilis (Zikán), influencing the dynamics of colony. Two techniques were used to evaluate the variation in cuticular chemical composition: Fourier transform infrared photoacoustic spectroscopy and gas chromatography coupled to mass spectrometry (GC-MS). Indeed, the application of JH did significantly alter the cuticular chemical composition of adult females that received treatment at the larval stage in comparison to control. The effects of JH were instar-dependent in that the results of topical application were significant when performed at third larval instar. Overall, these results add evidence that caste determination may, at least in part may be pre-imaginal in species of independent-founding social wasps.

Hymenolepis diminuta: an investigation of juvenile hormone titre, degradation and supplementation in the intermediate host, Tenebrio molitor

Parasitology ◽  
1990 ◽  
Vol 100 (3) ◽  
pp. 445-452 ◽  
Author(s):  
H. Hurd ◽  
C. Strambi ◽  
N. E. Beckage
Keyword(s):  
Juvenile Hormone ◽  
Intermediate Host ◽  
Topical Application ◽  
Post Infection ◽  
Reproductive Output ◽  
Endocrine System ◽  
Tenebrio Molitor ◽  
Hymenolepis Diminuta ◽  
Significant Difference ◽  
Female Control

SUMMARYMetacestodes of Hymenolepis diminuta cause a perturbance of vitellogenesis in the intermediate host Tenebrio molitor. The reduction in host reproductive output associated with infection may be due to this pathophysiology. Many of these events are regulated by host juvenile hormone (JH). A comparison of the titre of JH and its rate of degradation in female control and parasitized 15-day-old insects has been made. Haemolymph from female beetles contained 1·27 pMol JH equivalents/100 µl. No significant difference was associated with infection. However, topical application of a JH analogue, methoprene, at the time of infecion or 8 days post-infection reduced the significant accumulation of vitellogenin usually found in the haemolymph of females 12 days or more post-infection. These findings indicate that parasite-induced alteration of host vitellogenesis is not mediated via alteration in JH titres, although observations made after hormone supplementation suggest some form of interaction between the parasite and the host endocrine system.

OVICIDAL EFFECT IN THE WHITE PINE WEEVIL, PISSODES STROBI (COLEOPTERA: CURCULIONIDAE), OF A SYNTHETIC ANALOGUE OF JUVENILE HORMONE

1973 ◽  
Vol 105 (4) ◽  
pp. 591-594 ◽  
Author(s):  
Arthur Retnakaran
Keyword(s):  
Embryonic Development ◽  
Juvenile Hormone ◽  
Topical Application ◽  
Embryonic Mortality ◽  
Synthetic Analogue ◽  
White Pine ◽  
Pissodes Strobi ◽  
Pine Weevil ◽  
Ovicidal Effect ◽  
White Pine Weevil

AbstractTopical application of a synthetic juvenile hormone, 1-(4′-ethylphenoxy)-3,7-dimethyl-6,7-epoxy oct-2-ene, to the eggs of the white pine weevil, Pissodes strobi Peck, inhibits embryonic development. Both embryonic and post-embryonic mortality were observed. The construction of simulated ovipositional twigs used in collecting weevil eggs of known age is described. Possible physiological methods of controlling the weevil are discussed.

EFFECTS OF ANTENNECTOMY AND A JUVENILE HORMONE ANALOG ON PHEROMONE PRODUCTION IN THE BOLL WEEVIL (COLEOPTERA: CURCULIONIDAE)

1988 ◽  
Vol 23 (1) ◽  
pp. 52-58 ◽  
Author(s):  
J. C. Dickens ◽  
W. L. McGovern ◽  
G. Wiygul
Keyword(s):  
Juvenile Hormone ◽  
Aggregation Pheromone ◽  
Topical Application ◽  
Olfactory Receptors ◽  
Boll Weevil ◽  
Anthonomus Grandis ◽  
Pheromone Production ◽  
Juvenile Hormone Analog ◽  
Hormone Analog

Aggregation pheromone production by male boll weevils, Anthonomus grandis grandis Boheman can be stimulated by both antennectomy and topical application of a juvenile hormone analog (JHA, methoprene). Since JHA decreases sensitivity of antennal olfactory receptors, its effects on pheromone production may possibly be by either stimulating release of some blood-borne factor or decreasing antennal input.

Juvenile hormone and caste determination in a stingless bee

1975 ◽  
Vol 62 (2) ◽  
pp. 98-99 ◽  
Author(s):  
L. A. de Oliveira Campos ◽  
F. M. Velthuis-Kluppell ◽  
H. H. W. Velthuis
Keyword(s):  
Juvenile Hormone ◽  
Stingless Bee ◽  
Caste Determination

Hormonal control of ovarian development and metamorphosis in Malacosoma pluviale

1969 ◽  
Vol 47 (5) ◽  
pp. 917-920 ◽  
Author(s):  
T. S. Sahota
Keyword(s):  
Juvenile Hormone ◽  
Adult Development ◽  
Methyl Ether ◽  
Topical Application ◽  
Ovarian Development ◽  
Hormonal Control ◽  
Juvenile Hormone Mimic

Simplified preparations, such as isolated abdomens, were used to study the effect of farnesyl methyl ether (a juvenile hormone mimic) and ecdysone on ovarian development and adult development in Malacosoma pluviale. Untreated isolated abdomens showed very limited ovarian development and failed to form imaginal cuticle, thus indicating a lack of adult development. Topical application of farnesyl methyl ether to the isolated abdomens blocked the ovarian development completely and no adult development ensued either. Both adult development and ovarian development of the isolated abdomens were stimulated by ecdysone injections. Thus, adult development and ovarian development in M. pluviale seem to be closely related.

scholarly journals Phenotypic plasticity in an ant with strong caste–genotype association

2018 ◽  
Vol 14 (1) ◽  
pp. 20170705 ◽  
Author(s):  
Alexandre Kuhn ◽  
Hugo Darras ◽  
Serge Aron
Keyword(s):  
Phenotypic Plasticity ◽  
Environmental Factors ◽  
Juvenile Hormone ◽  
Hormone Treatment ◽  
Caste Determination ◽  
Developmental Pathway ◽  
Natural Conditions ◽  
Social Hymenoptera ◽  
Laboratory Conditions ◽  
Genetically Determined

Caste determination in social Hymenoptera (whether a female egg develops into a reproductive queen or a sterile worker) is a remarkable example of phenotypic plasticity where females with highly similar genomes exhibit striking differences in morphology and behaviour. This phenotypic dichotomy is typically influenced by environmental factors. However, recent studies have revealed a strong caste–genotype association in hybridogenetic ants: workers are all interlineage hybrids while queens are all purebred, suggesting that female caste fate is genetically determined. Using the hybridogenetic ant Cataglyphis mauritanica , we show that under laboratory conditions, purebred offspring develop into reproductive queens but occasionally give rise to workers. Moreover, while hybrids typically become workers, juvenile hormone treatment can switch their developmental pathway to the reproductive caste. These results indicate that phenotypic plasticity has been retained in an ant with a strong caste–genotype association, despite its lack of expression in natural conditions.

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