Release of prothoracicotropic hormone and potentiation of developmental ability during diapause in the bollworm, Heliothis zea

Meola, Roger W.; Adkisson, Perry L.

doi:10.1016/0022-1910(77)90084-1

Cited by 76 publications

(25 citation statements)

References 28 publications

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“…These processes are mediated by temperature and operate simultaneously and are additive. Such a theory appears consistent with the biochemical principles suggested by Meola and Adkisson (1977).…”

Section: Discussionsupporting

confidence: 87%

“…It now follows that (1), when evaluated at any time of observation t when the pupa exists and has not yet emerged as a moth, is effectively independent of t, and has the value A(t)dt where A(t) = A(Ot). Substituting in (3) and integrating, we get G(t)~1-exp{ -tA( U)dU} (5) Meola and Adkisson (1977) suggest that diapause termination is a dual process controlled by the release of hormones. The first of these potentiates pupal development and the second regulates development.…”

Section: Regimesmentioning

confidence: 99%

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Biothermal Development: A Model for Predicting the Distribution of Emergence Times of Diapausing Heliothis Armigera

1981

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Summary Laboratory data on the time to termination of diapause and the subsequent time to emergence of the Heliothis armigera moth have been analysed in relation to temperature. Excluding the data observed at 18 °C, the times to termination of diapause follow a geometric distribution and the subsequent times to emergence are approximately uniform over a small range of about three days. Based on these results a model has been developed for the prediction of the distribution of moth emergence times in a situation of continuously varying temperatures, i.e. in the field situation. The predictions compare well with the observed emergence in each of the five years 1974–78. This study provides empirical evidence to support the theory that break of diapause is a dual process; potentiation of development is a random exponential process and development itself is a deterministic process. Both mechanisms are assumed to be dependent only on temperature.

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Section: Discussionsupporting

confidence: 87%

Section: Regimesmentioning

confidence: 99%

Biothermal Development: A Model for Predicting the Distribution of Emergence Times of Diapausing Heliothis Armigera

1981

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“…Larval diapause is usually characterized by a shut down of the brain-prothoracic gland axis and the prothoracic gland (PG) fails to synthesize the ecdysteroids. This may be caused by either the failure of the brain to release the neuropeptide prothoracicotropic hormone (PTTH) needed to stimulate the PG [25] or by failure of the PG to respond to PTTH until an adequate period of chilling has been experienced [26]. Specific patterns of gene expression and unique metabolic profiles characterize diapause and the cross-talk between fat body and brain regulates developmental arrest [27].…”

Section: Discussionmentioning

confidence: 99%

Global Transcriptome Analysis of Orange Wheat Blossom Midge, Sitodiplosis mosellana (Gehin) (Diptera: Cecidomyiidae) to Identify Candidate Transcripts Regulating Diapause

Jin

Duan

et al. 2013

PLoS ONE

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BackgroundMany insects enter a developmental arrest (diapause) that allows them to survive harsh seasonal conditions. Despite the well-established ecological significance of diapause, the molecular basis of this crucial adaptation remains largely unresolved. Sitodiplosis mosellana (Gehin), the orange wheat blossom midge (OWBM), causes serious damage to wheat throughout the northern hemisphere, and sporadic outbreaks occur in the world. Traits related to diapause appear to be important factors contributing to their rapid spread and outbreak. To better understand the diapause mechanisms of OWBM, we sequenced the transcriptome and determined the gene expression profile of this species.Methodology/Principal FindingsIn this study, we performed de novo transcriptome analysis using short-read sequencing technology (Illumina) and gene expression analysis with a tag-based digital gene expression (DGE) system. The sequencing results generated 89,117 contigs, and 45,713 unigenes. These unigenes were annotated by Blastx alignment against the NCBI non-redundant (nr), Clusters of orthologous groups (COG), gene orthology (GO), and the Kyoto Encyclopedia of Genes and Genomes (KEGG) databases. 20,802 unigenes (45.5% of the total) matched with protein in the NCBI nr database. Two digital gene expression (DGE) libraries were constructed to determine differences in gene expression profiles during diapause and non-diapause developmental stages. Genes related to diapause were analyzed in detail and in addition, nine diapause-related genes were analyzed by real time PCR.Conclusions/SignificanceThe OWBM transcriptome greatly improves our genetic understanding and provides a platform for functional genomics research of this species. The DGE profiling data provides comprehensive information at the transcriptional level that facilitates our understanding of the molecular mechanisms of various physiological aspects including development and diapause stages in OWBM. From this study it is evident that various genes coding metabolic enzymes are crucial for diapause and metamorphosis.

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“…Decerebration prior to PTTH release locks pupae into a diapause‐like state in which it will remain for many months [28]. Furthermore, it has been reported that removal of the prothoraric glands early in diapause traps the pupae permanently in diapause when they were transferred to a favorable temperature [29]. Based on these results, it was thought that the brain would fail to exert its tropic action on the prothoracic gland by the release of PTTH in diapausing pupae.…”

Section: Discussionmentioning

confidence: 99%

Role of dopamine at the onset of pupal diapause in the cabbage armyworm Mamestra brassicae

Noguchi

Hayakawa

1997

FEBS Letters

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Experiments were conducted to examine the relationship between an onset of diapause and dopamine (DA) content in the cabbage armyworm Mamestra brassicae during pupation. The DA levels were significantly higher in haemolymph, integument and brain-central nervous system of diapausedestined pupae than in non-diapause-destined pupae. The elevated level of the integumental DA content was demonstrated to be due to an increase in dopa decarboxylase activity in diapausing pupal integuments through an enhancement of transcript levels of this enzyme. Elevation of the DA level accomplished by feeding L-DOPA to last instar larvae induced a diapause-like state in more than 50% of the pupae under long daylengths.

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Release of prothoracicotropic hormone and potentiation of developmental ability during diapause in the bollworm, Heliothis zea

Cited by 76 publications

References 28 publications

Biothermal Development: A Model for Predicting the Distribution of Emergence Times of Diapausing Heliothis Armigera

Biothermal Development: A Model for Predicting the Distribution of Emergence Times of Diapausing Heliothis Armigera

Global Transcriptome Analysis of Orange Wheat Blossom Midge, Sitodiplosis mosellana (Gehin) (Diptera: Cecidomyiidae) to Identify Candidate Transcripts Regulating Diapause

Role of dopamine at the onset of pupal diapause in the cabbage armyworm Mamestra brassicae

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