...–presoldier–soldier) that are driven at the endocrine level by juvenile hormone (JH). Although physiological and eusocial mechanisms tied to JH signaling have been studied, the role of gut symbionts in the caste differentiation process is poorly understood. Here, we used the JH analog methoprene...

... in the safety of the nest and thus be more competitive in mating. We also demonstrate that both male dispersal and maturation are associated with juvenile hormone (JH), a key regulator of insect reproductive physiology and behaviour, which also has derived functions regulating social organisation in female...

... for fecundity, and metabolism of juvenile hormone (JH), which acts as gonadotropin in adult insects. For this study, we used six D. melanogaster lineages carrying the nuclear background of interbred Bi90 lineage and cytoplasmic backgrounds with or without Wolbachia of different genotype variants. The w MelCS...

...Inga Y. Rauschenbach; Evgenia K. Karpova; Natalya V. Adonyeva; Olga V. Andreenkova; Natalya V. Faddeeva; Elena V. Burdina; Alexander A. Alekseev; Petr N. Menshanov; Nataly E. Gruntenko Juvenile hormone (JH) and dopamine are involved in the stress response in insects. The insulin/insulin-like growth...

...Hans C. Kelstrup; Klaus Hartfelder; Fabio S. Nascimento; Lynn M. Riddiford In the evolution of caste-based societies in Hymenoptera, the classical insect hormones juvenile hormone (JH) and ecdysteroids were co-opted into new functions. Social wasps, which show all levels of sociality and lifestyles...

... division is age based or age flexible, and whether it coincides with differential expression of systemic hormones with known roles in behavioral regulation. Whole-body content of juvenile hormone (JH) and ecdysteroids was determined in workers from (1) age-typical colonies, in which a typical age structure...

.... This effect was not observed when abdomens were cultured on saline containing the sugar rhamnose,which insects cannot metabolise to glucose. Virgins injected with the juvenile hormone (JH) analogue, methoprene, showed the same effects as mated females with respect to pheromone titre and haemolymph trehalose...

... plasticity has not been studied in a moth with an extended period of reproductive inactivity. In this study, we ask whether male antennal response and flight behavior are plastic during different stages of reproductive inactivity and whether these responses are regulated by juvenile hormone. Antennal...

...Thomas Flatt; Andreas Heyland; Florentina Rus; Ermelinda Porpiglia; Chris Sherlock; Rochele Yamamoto; Alina Garbuzov; Subba R. Palli; Marc Tatar; Neal Silverman SUMMARY Juvenile hormone (JH) and 20-hydroxy-ecdysone (20E) are highly versatile hormones, coordinating development, growth, reproduction...

... juvenile hormone(JH) is often involved in directing the differentiation of polyphenic behavioral castes. The present study examines the effects of JH, environment and feeding on caste polyphenism in a eusocial insect, the termite Reticulitermes flavipes (Kollar). Our approach included a combination...

... morph has not yet been measured for G. texensis ]. Environmental factors that bias development towards one morph or the other include temperature, photoperiod,density and diet ( Harrison,1980 ). Proximately, wing morph is determined by juvenile hormone(JH) titre, which is elevated in larvae...

... . takeout encodes a putative juvenile hormone (JH)binding protein and has been described as a link between circadian rhythm and feeding behaviour. However, the physiological role of takeout and its putative link to JH remain unknown. In this study, we show that takeout ( to 1 ) flies failed to adapt...

... nutrient stores to develop eggs. To determine how larval nutrition affects the endocrinology of egg development in these females, we manipulated the quantity of larval food and measured in vitro production of juvenile hormone (JH) by corpora allata (CA) and ecdysteroids by ovaries. Newly emerged A. aegypti...

...Abrahim S. Caroci; Yiping Li; Fernando G. Noriega SUMMARY We investigated the relationship among nutritional reserves,previtellogenic ovary development and juvenile hormone (JH) synthesis in Aedes aegypti female mosquitoes. By raising larvae under different nutritional regimes, two adult phenotypes...

...Uwe Rose SUMMARY Reproductive behaviour of animals requires a well-adapted muscular system. This study examines the structural and functional development of ovipositor muscle properties in female locusts during reproductive development. A possible regulation by juvenile hormone (JH) was assessed...

...Joseph P. Sullivan; Susan E. Fahrbach; Jon F. Harrison; Elizabeth A. Capaldi; Jennifer H. Fewell; Gene E. Robinson SUMMARY Three experiments were performed to determine why removal of the corpora allata (the glands that produce juvenile hormone) causes honey bees to fail to return to their hive...

... of the pheromone, its production could be enhanced by topical application of juvenile hormone III (JH III) (eightfold), by antennectomy (40-fold) or by the combined treatment of JH III and antennectomy (almost 200-fold); this enhancement enabled the identification of the compound as( S )-3,7-dimethyl-2-oxo-oct-6...

... of the locust abdominal muscles involved in oviposition behaviour were investigated with respect to their maturation, segment- and gender-specificity and regulation by juvenile hormone (JH). Muscles from the sixth abdominal segment (an oviposition segment) of mature females (>18 days old) were able...

... synthesis/release of the juvenile hormones. To determine whether differences in cytosolic free [Ca 2+ ] in CA cells were associated with different levels of gland activity, methods were developed for dissociating CA cells with the retention of biosynthetic activity and for uptake by the dissociated cells...

... juvenile hormone (JH) in vitro indicates that the above sequence of endocrine events begins only when JH synthesis has reached a nadir for the instar. Since CA activity is an indirect measure of the haemolymph titre of the hormone, it is conceivable that the developmentally cued release of PTTH...