Neurosecretory system of the earwig Labedura riparia, and the rôle of the aorta as a neurohaemal organ

Awasthi, V.B.

doi:10.1016/0022-1910(75)90184-5

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…Our results further emphasize the need for surgical allatectomy in future studies directed toward lowering endogenous levels of JH 111; however, the very close association of the corpora allata with the dorsal aorta (see DeLerma, 1942;Cazal, 1948;Ozeki, 1958aOzeki, , 1961Lhoste, 1957;Awasthi, 1975;Juberthie & Caussanel, 1980; for descriptions of neuroendocrine systems in various earwigs) render successful allatectomy unlikely in E.annulipes.…”

Section: Effects Ofprecocene IImentioning

confidence: 67%

“…We have shown that topically applied JH I11 significantly advanced the onset of courtship behaviour in adult female E.annulipes. Because with high doses of JH I11 the behavioural response occurred within hours of treatment, it would appear that this behaviour is either directly linked to elevated levels of JH or to some factor readily evoked by this treatment; for example, release of neurosecretory material from the pars intercerebralis, corpora cardiaca, or aorta (the aorta is neurohaemal in Lriparia; Awasthi, 1975;Caussanel et al, 1978;Juberthie & Caussanel, 1980). To our knowledge, there are no reports of physiological correlates to courtship in any earwig.…”

Section: Courtship and Matingmentioning

confidence: 99%

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Physiological correlates to courtship, mating, ovarian development and maternal behaviour in the ring‐legged earwig

Rankin

Fox

Stotsky

1995

Physiological Entomology

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The involvement of the endocrine system in courtship, mating, maternal behaviour and the gonadotrophic cycle was studied in the earwig, Eubnrellia annulipes, after application of JH 111 and, alternatively, precocene 11.Topical application of 35 or 122 pg of JH 111 to newly eclosed females advanced the onset of courtship behaviour from 6.6 f 1.3 days in acetone-treated controls to 1.4 f 2.8 and 0.5 k 2.5 days, respectively. Application of 6 pg of JH I11 had no effect on the onset of courtship behaviour. Applications of Juvenile Hormone had no significant effect on the age at first mating nor on the duration of mating, though the trend is towards advanced onset. The age at first oviposition was advanced by hormone treatment; clutch size and the proportion of offspring hatching was reduced by hormone treatment. The interclutch interval, size and proportion hatching of the second clutch were not affected by hormone treatment. Topical application of 50 pg of JH I11 to females on the day of oviposition shortened the total duration of maternal care from 15.4 f 0.5 to 5.3 f 1.7 days; whereas in acetone-treated and precocene 11-treated groups maternal care lasted 16.1 f 1.9 and 13.8 f 1.6 days, respectively. The duration of maternal care was positively correlated with number of offspring hatching and fledging.In a corollary experiment, topical application of JH 111 significantly enhanced the onset of the second gonadotrophic cycle as assessed by basal follicle length; application of 20 pg of precocene 11, either singly or in repeated doses, did not delay growth of basal follicles. Finally, repeated application of as much as 80 pg of precocene I1 had no effect on basal follicle length, nor on ovary wet weights.These results are consistent with the hypothesis that intermediate to high titres of JH are associated with oocyte growth, mating, and the cessation of maternal care; low titres of JH appear to be associated with the period of maternal behaviour and slow ovarian follicle development.

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Section: Effects Ofprecocene IImentioning

confidence: 67%

Section: Courtship and Matingmentioning

confidence: 99%

Physiological correlates to courtship, mating, ovarian development and maternal behaviour in the ring‐legged earwig

Rankin

Fox

Stotsky

1995

Physiological Entomology

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“…In certain earwigs, such as Labidura riparia and Euborellia annulipes, the cephalic aorta has been identified as a neurohaemal organ besides the classical corpus cardiacum ( Awasthi 1975). It has been shown, for example, that the level of exocytosis in the neurosecretory terminals of the aorta wall increased during egg‐laying in L. riparia, suggesting that neurosecretory material, arising from the pars intercerebralis of the brain and stored in the cephalic aorta, could have a regulatory function on egg‐laying ( Juberthie & Caussanel 1980).…”

Section: Introductionmentioning

confidence: 99%

“…1987 ). The other cosmopolitan species is Labidura riparia belonging to the superfamily Labiduroidea, in which the neurohaemal aorta was described ( Awasthi 1975).…”

Section: Introductionmentioning

confidence: 99%

Presence of an adipokinetic peptide in the corpus cardiacum of Dermaptera but not in the neurohaemal aorta, and chemical and functional identification of the peptide

GÄde

1999

Physiological Entomology

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Corpora cardiaca of the earwigs Labidura riparia and Forficula auricularia contain a substance that causes hyperlipaemia in migratory locusts and hypertrehalosaemia in the American cockroaches. A conspecific bioassay in L. riparia revealed that this factor is lipid‐mobilizing. Isolation of the neuropeptide was achieved by single‐step RP‐HPLC. The primary structure of the earwig adipokinetic peptide was elucidated by automated Edman degradation in combination with matrix‐assisted laser desorption/ionization mass spectrometry. It is a blocked octapeptide, pGlu‐Val‐Asn‐Phe‐Ser‐Thr‐Gly‐Trp‐NH2, previously denoted as Grb‐AKH and first identified in Gryllus bimaculatus ( Gäde & Rinehart 1987). The synthetic peptide co‐chromatographed under various conditions with the native peptide and, in biological assays, resulted in lipid‐mobilization in L. riparia when injected in low concentration.

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“…JH is produced and released from the corpus allatum, which in earwigs is a single median gland closely associated with the paired neurohemal corpora cardiaca and the dorsal aorta (DeLerma, 1942;Cazal, 1948;Ozeki, 1958Ozeki, , 1961Lhoste, 1957;Awasthi, 1975;Juberthie and Caussanel, 1980). It has long been recognized that the corpora allata are required for reproduction in many adult insects, including earwigs (Ozeki, 1951).…”

Section: Introductionmentioning

confidence: 98%

Juvenile hormone in earwigs: Roles in oogenesis, mating, and maternal behaviors

Rankin

Chambers²,

Edwards³

1997

Arch. Insect Biochem. Physiol.

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Neurosecretory system of the earwig Labedura riparia, and the rôle of the aorta as a neurohaemal organ

Cited by 16 publications

References 8 publications

Physiological correlates to courtship, mating, ovarian development and maternal behaviour in the ring‐legged earwig

Physiological correlates to courtship, mating, ovarian development and maternal behaviour in the ring‐legged earwig

Presence of an adipokinetic peptide in the corpus cardiacum of Dermaptera but not in the neurohaemal aorta, and chemical and functional identification of the peptide

Juvenile hormone in earwigs: Roles in oogenesis, mating, and maternal behaviors

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