Effects of juvenile hormone analog on physiological and behavioral maturation in honeybee drones

Harano, Ken-ichi

doi:10.1007/s13592-013-0208-7

Cited by 15 publications

(8 citation statements)

References 47 publications

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“…Many earlier studies show that JH stimulates maturation of reproductive organs in males and females of diverse insects (Wigglesworth 1936;Loher 1961;Blaine and Dixon 1973;Herman 1975;Piulachs et al 1992;Bloch et al 2000;Heming 2003;Shpigler et al 2020). In contrast, some reports demonstrated contradictory effects of methoprene on physiological maturation in honeybee males (Harano 2013). The most information about the spermatogenesis in bees comes from honeybee drones.…”

Section: Discussionmentioning

confidence: 99%

Methoprene, a juvenile hormone analogue, modifies maturation and emergence in overwintering Osmia rufa L. adults

2021

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The development of methods aimed at activation of imagos at any point of wintering provides a compelling potential avenue to utilize bees for pollination of greenhouse crops during autumn, winter, and early spring. In this study, we tested methoprene, a juvenile hormone (JH) analogue as a chemical stimulant to end a diapause of Osmia rufa L. and enable bee activation and emergence under experimental conditions. The application of methoprene significantly reduced the emergence time of adult bees in winter months as compared to vehicle (acetone) and negative controls. Bees treated with methoprene started to emerge 3–6 days earlier than bees from acetone and control groups and finished emergence 2–6 days earlier too. Statistically significant differences were observed between methoprene and controls groups of male and female in all tested incubation periods. It was also observed that the effects of methoprene were significantly more effective in female specimens during the first 2 months of winter. Moreover, in females, methoprene improved reproductive traits such as an increase in the size of terminal oocytes. Similarly, in males, methoprene treatment resulted in a significant increase in a seminal vesicle size and dynamic elevation of spermatozoa number. Taken together, our results indicate that methoprene may play an important role in the termination of diapause, bee activation, and emergence.

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Section: Discussionmentioning

confidence: 99%

Methoprene, a juvenile hormone analogue, modifies maturation and emergence in overwintering Osmia rufa L. adults

2021

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“…However, as most studies have their focus on female reproduction in the adult life cycle, males are the neglected gender. In fact, most of the studies on the role of hormones in male reproduction are concerned with their effects on the function of male accessory glands in adult males, including honey bees (Colonello and Hartfelder 2003;Harano 2013). In contrast, testis development and spermatogenesis in honey bees are fully integrated within the progression of postembryonic development.…”

Section: Hormonal Regulation Of Testis Development and Spermatogenesismentioning

confidence: 99%

Testis development and spermatogenesis in drones of the honey bee, Apis mellifera L.

et al. 2020

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Like Apis mellifera queens and different from all other bees, drones also have an exaggerated gonad phenotype, with over 150 serial units in each gonad. Yet, compared with the ovaries of the female castes, little is known about the development of the honey bee testis. Here we present a histological atlas on postembryonic testis development and spermatogenesis. Already in the first instar larvae, the testioles composing each testis can be distinguished. The testioles then grow along their apical-basal axis by mitotic divisions of the spermatogonia, which eventually form germ cell clusters. Meiosis starts when brood cells are capped, and it ends with the appearance of spermatids in red-eyed pupae. Subsequently, spermiogenesis takes place, and all spermatozoa are formed before adult emergence. We also present the first data on juvenile hormone levels in drone larvae. With this, we provide a database for future research on gonad development in honey bee drones.

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“…In contrast with the large knowledge on how JH participate in oogenesis in female insects, its role in the maturation of male reproductive organs has been investigated only partially so far. In many insects JH does not appear to regulate spermiogenesis in the testes (Wyatt and Davy, 1996); on the other hand, JH may promote the secretory activity of accessory glands (Harano, 2013). These observations indicate that neuroendocrine mechanisms differ between males and females, highlighting the need to extend the analysis of the effect of one or more parasites also to the neglected male social Hymenoptera .…”

Section: Discussionmentioning

confidence: 99%

Subtle effect of Xenos vesparum (Xenidae, Strepsiptera) on the reproductive apparatus of its male host: Parasite or parasitoid?

Beani

Marchini

Cappa

et al. 2017

Journal of Insect Physiology

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A B S T R A C TParasitic castration is an adaptive strategy where parasites usurp the hosts' reproductive physiology to complete their life cycle. The alterations in the host traits vary in their magnitude, from subtle changes in the host morphophysiology and behaviour to the production of complex aberrant phenotypes, which often depend on the host gender. The strepsipteran macroparasite Xenos vesparum induces dramatic behavioural and physiological changes in its female host, the paper wasp Polistes dominula, while its effect on the male phenotype is largely unknown.In this study we investigated how a single X. vesparum parasite influences the functional morphology of P. dominula male reproductive apparatus. We performed morphometry and ultrastructure characterization of corpora allata, testes, seminal vesicles and accessory glands in parasitized and unparasitized males, and also in young and old males to control for the effect of age on the natural deterioration of these organs. Our results show that age significantly affects the development of male reproductive apparatus. A low parasite load -one parasite per host is the common prevalence in the field -has only a marginal impact on the reproductive morphology of P. dominula males, affecting quantitatively but not qualitatively the protein content of male accessory glands. Thus, in male P. dominula wasps, X. vesparum appears to behave as a true "parasite", in clear opposition to the role of "parasitoid" that it takes in female hosts where castration causes the reproductive death.

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Effects of juvenile hormone analog on physiological and behavioral maturation in honeybee drones

Cited by 15 publications

References 47 publications

Methoprene, a juvenile hormone analogue, modifies maturation and emergence in overwintering Osmia rufa L. adults

Methoprene, a juvenile hormone analogue, modifies maturation and emergence in overwintering Osmia rufa L. adults

Testis development and spermatogenesis in drones of the honey bee, Apis mellifera L.

Subtle effect of Xenos vesparum (Xenidae, Strepsiptera) on the reproductive apparatus of its male host: Parasite or parasitoid?

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