Activation of the prothoracic gland by juvenile hormone and prothoracicotropic hormone in Mamestra brassicae

Hiruma, Kiyoshi; Shimada, Hiroshi; Yagi, Shigemi

doi:10.1016/0022-1910(78)90037-9

Cited by 71 publications

(12 citation statements)

References 10 publications

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“…The prothoracic glands are suppressed by JH during the feeding period of the fifth instar (Hiruma et al, 1978;Sakurai and Imokawa, 1988;Sakurai, 1990), but they may not be in the fourth instar because they secrete ecdysone in the presence of JH. In order to determine the time when sensitivity to JH is switched, we applied JHA 24 h before dissecting the prothoracic glands and incubated the glands in the presence or absence of PTTH, dbcAMP or IBMX (Fig.…”

Section: Effects Of Jha On Basal Secretory Activity and Ptth Responsementioning

confidence: 98%

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Regulation of prothoracic gland ecdysteroidogenic activity leading to pupal metamorphosis

Takaki

Sakurai

2003

Insect Biochemistry and Molecular Biology

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Section: Effects Of Jha On Basal Secretory Activity and Ptth Responsementioning

confidence: 98%

“…JH suppresses feedback activation of the glands in the feeding period of the last instar (Sakurai and Imokawa, 1988) as well as PTTH release from the brain (Hiruma et al, 1978;Rountree and Bollenbacher, 1986). Prothoracic glands of the silkworm begin to secrete ecdysone from day 3 of the last instar (Sakurai, 1984).…”

Section: Introductionmentioning

confidence: 96%

Regulation of prothoracic gland ecdysteroidogenic activity leading to pupal metamorphosis

Takaki

Sakurai

2003

Insect Biochemistry and Molecular Biology

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“…Larval prothoracic glands of neckligated Marnestva brussicue can be activated by methoprene treatment and 95% of the treated population pupated [15]; however, cervically ligated diapausing codling moth larvae did not pupate after methoprene treatment. The prothoracicotropic effect of JH was via the head, rather than directly or solely on the prothoracic glands [ 141.…”

Section: Discussionmentioning

confidence: 97%

Physiological relationship between a diapausing endoparasitoid (Ascogaster quadridentata) and its dormant host (Cydia pomonella)

Brown¹,

Reed‐Larsen²,

Ahl³

1990

Arch Insect Biochem Physiol

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The facultative diapause of Ascogaster quadridentata depends upon the photoperiod experienced by its host. A host exposed to short day lengths (12L:12D) ceases development in its fourth stadium, spins a cocoon, and remains dormant throughout the winter. A first stadium parasitoid larva overwinters in a true diapause, within its dormant host.Dormancy of both animals is due to a failure of the host's endocrine system. Upon transfer of the host from dormancy-maintaining (OL:24D, 4°C) to dormancy-terminating conditions (DTC = 16L:8D, 25°C) a host cephalic factor is released. The cephalic factor blocked by host ligation within 48 h of transfer to DTC was circumvented by an injection of the host with 20-hydroxyecdysone. Farasitoid larvae that were either isolated within the abdomen of 20-hydroxyecdysone-injected hosts or held in vitro with the molting hormone initiated apolysis.An increased titer of hemolymph juvenile hormone, which was present 48 h after the host was transferred to DTC, may have had a prothoracicotropic effect upon the hostlparasitoid unit. A topical application of 1 ng of methoprene, concurrent to host transfer to DTC, accelerated parasitoid development. No parasitoid development was evident if the host was neck-ligated at the time of its methoprene treatment and transfer to DTC. These data suggest that the prothoracicotropic effect of methoprene was via the host head, rather than directly on the host prothoracic glands, or the parasitoid itself.Key words: Braconidae, Tortricidae, methoprene, juvenile hormone INTRODUCTIONAscogaster quadridentaka Wesmael (Braconidae) is an egg/larval parasitoid of the codling moth, Cydia pornonella (Tortricidae) L. Cox [l] described the life

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“…In Lepidopteran species, a role for JH in modification of haemolymph ecdysteroid titre has been demonstrated (e.g. Gilbert & Schneiderman, 1959;Nijhout & Williams, 1974;Hiruma et al, 1978;Cymborowski & Stolarz, 1979;Safranek et al, 1980;Gruetzmacher et al, 1984;Jones et al, 1986;Shaaya etal., 1986). It is also known that in Blattella germanica, treatment with JHA reduced ecdysteroid titres, resulting in the formation of permanent larvae (Masner et al, 1975), whereas in Oncopeltus fasciatus, treatment with JHA accelerated ecdysteroid production, decreased the duration of the last stadium and resulted in the production of supernumerary larvae (Smith & Nijhout, 1981;Redfern et al, 1982).…”

Section: Discussionmentioning

confidence: 99%

Morphogenetic and gonadotrophic effects of a juvenile hormone analogue ((7S)‐hydroprene) in last instar female larvae of Diploptera punctata

Kikukawa

Smith

Tobe

1989

Physiological Entomology

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ABSTRACT. The effect of treatment of last instar female larvae of Diploptera punctata with a Juvenile Hormone (JH) analogue, (7S)‐hydroprene, has been determined with respect to the ability of the analogue to alter the duration of the stadium and the nature of the ensuing ecdysis. We have also investigated the effects of the analogue on JH release, the growth of the basal oocytes, as well as ecdysteroid titres during the fourth stadium. Analogue treatment prior to day 10 of the stadium results in prolongation of the stadium and desynchronization of ecdysteroid release. Thereafter, treatment with the analogue has little effect. Analogue treatment results also in the formation of supernumerary larvae and intermediates, in a dose‐dependent fashion, provided that animals are treated on day 10 or earlier. Thus, the ‘critical’ period for metamorphosis in last instar D. punctata is between days 0 and 10. Treatment with (7S)‐hydroprene produces profound effects also on both JH release, and basal oocyte growth. At a dose of 500μg administered on day 1, JH release is stimulated significantly at a time when JH release is normally undetectable. Significant growth of basal oocytes is observed in such treated animals, and appears to precede the peak in JH release. We suggest that the growth of the basal oocytes, as a result of analogue treatment, stimulates the production of JH by CA in these last instar larvae.

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Activation of the prothoracic gland by juvenile hormone and prothoracicotropic hormone in Mamestra brassicae

Cited by 71 publications

References 10 publications

Regulation of prothoracic gland ecdysteroidogenic activity leading to pupal metamorphosis

Regulation of prothoracic gland ecdysteroidogenic activity leading to pupal metamorphosis

Physiological relationship between a diapausing endoparasitoid (Ascogaster quadridentata) and its dormant host (Cydia pomonella)

Morphogenetic and gonadotrophic effects of a juvenile hormone analogue ((7S)‐hydroprene) in last instar female larvae of Diploptera punctata

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