Diapause induction in aphid parasitoids

Polgár, László; Hardie, Jim

doi:10.1046/j.1570-7458.2000.00712.x

Cited by 54 publications

(25 citation statements)

References 9 publications

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“…Similar interaction of direct thermal and maternal photoperiodic responses has been found also in certain other hymenopteran parasitoids from families Aphidiidae (Brodeur & McNeil, 1989;Polgár & Hardie, 2000), Braconidae (Ryan, 1965;Kenis, 1997;Li et al, 2008), and Eulophidae (Milonas & SavopoulouSoultani, 2000).…”

Section: Discussionsupporting

confidence: 65%

Comparative analysis of maternal and grand-maternal photoperiodic responses of Trichogramma species (Hymenoptera: Trichogrammatidae)

Войнович¹,

Vaghina²,

Reznik³

2013

Eur. J. Entomol.

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Abstract. Maternal and grand-maternal photoperiodic responses of Trichogramma buesi, T. embryophagum, T. evanescens, T. piceum, T. principium, and T. telengai were investigated in laboratory conditions. During the experiment, grand-maternal and maternal generations developed at 20°C and one of the 4 photoperiodic regimes: L : D = 12 : 12, 14 : 10, 16 : 8, and 18 : 6 (in total, 16 combinations) while the progeny developed at L : D = 12 : 12 and one of the 3 thermal regimes: 13, 14, and 15°C. The proportion of diapausing individuals in the progeny of all the studied species was significantly dependent on the direct influence of temperature and on the maternal photoperiodic response. The influence of the photoperiodic conditions during development of the grandmaternal generation was statistically significant in 5 of the 6 studied species, being relatively weak in T. embryophagum and T. telengai, whose geographical ranges extend up to north-western regions of Europe (possibly, these wasps enter diapause so early that the grand-mothers of the diapausing generation develop under long day conditions). Comparative analysis showed that the thresholds of the maternal and grand-maternal photoperiodic responses coincided or almost coincided. The grand-maternal effect was stronger in the progeny of maternal females which developed under short day conditions than in those that developed under long day conditions. This pattern of interaction probably synchronizes the life cycle with seasonal changes because diapause is induced under decreasing day length and thus mothers of diapausing individuals develop at shorter daylength than do grand-mothers. We conclude that the grand-maternal and the maternal effects on Trichogramma progeny diapause are based on one and the same photoperiodic response. In nature, the grand-maternal effect increases the proportion of diapausing individuals in the progeny of females which have developed under short day conditions during two generations, thus achieving a "cumulative" photoperiodic effect.

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Section: Discussionsupporting

confidence: 65%

Comparative analysis of maternal and grand-maternal photoperiodic responses of Trichogramma species (Hymenoptera: Trichogrammatidae)

Войнович¹,

Vaghina²,

Reznik³

2013

Eur. J. Entomol.

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“…Possibly, the domination of the maternal photoperiodic response is a feature that had been acquired by the ancestors of modern Trichogrammatidae. Analysis of the literature [48,49,[52][53][54][55][56][57][58] shows that the maternal effect was recorded for many species of various families of hymenopteran parasitoids and their hosts live both in hidden and in open habitats. Possibly, the maternal effect was already inherent in their common ancestors that infected hiddenliving hosts.…”

Section: Regulation Of Diapause In Trichogrammae: Hierarchy Of Interamentioning

confidence: 99%

Ecological and evolutionary aspects of photothermal regulation of diapause in trichogrammatidae

Reznik

2011

J Evol Biochem Phys

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Facultative winter diapause in the genus of Trichogramma Westw. (Hymenoptera, Trichogrammatidae), like in most other insect species, is regulated by photoperiod and temperature. Their prepupae are diapausing, but sensitivity to temperature and day length (environmental cue factors inducing diapause) is characteristic of all stages of development from embryo to the egglaying female. The environmental cues can affect not only the current, but also the next generations. Under the natural conditions, the photothermal regulation provides the timely diapause induction coordinated both with the astronomical season (the photoperiodic response) and with the peculiarity of the given year (the thermal response). The special experiments revealed "rudimentary responses" that had lost their adaptive role. The results of these studies have proved once more that the specificity of photoperiodic and thermal diapause-regulating responses, their relative importance, and association with sensitive stages of development are determined not only by the ecological peculiarities of different insect taxa, but also by their previous evolution.

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“…Aphidiines represent a group of parasitic insects that can display both an obligatory and a facultative diapause in response to environmental signals [14], [15]. Aphidiines overwinter as pupae in their mummies (i.e.…”

Section: Introductionmentioning

confidence: 99%

Metabolic and Proteomic Profiling of Diapause in the Aphid Parasitoid Praon volucre

et al. 2012

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BackgroundDiapause, a condition of developmental arrest and metabolic depression exhibited by a wide range of animals is accompanied by complex physiological and biochemical changes that generally enhance environmental stress tolerance and synchronize reproduction. Even though some aspects of diapause have been well characterized, very little is known about the full range of molecular and biochemical modifications underlying diapause in non-model organisms.Methodology/Principal FindingsIn this study we focused on the parasitic wasp, Praon volucre that exhibits a pupal diapause in response to environmental signals. System-wide metabolic changes occurring during diapause were investigated using GC-MS metabolic fingerprinting. Moreover, proteomic changes were studied in diapausing versus non-diapausing phenotypes using a combination of two-dimensional differential gel electrophoresis (2D-DIGE) and mass spectrometry. We found a reduction of Krebs cycle intermediates which most likely resulted from the metabolic depression. Glycolysis was galvanized, probably to favor polyols biosynthesis. Diapausing parasitoids accumulated high levels of cryoprotective polyols, especially sorbitol. A large set of proteins were modulated during diapause and these were involved in various functions such as remodeling of cytoskeleton and cuticle, stress tolerance, protein turnover, lipid metabolism and various metabolic enzymes.Conclusions/SignificanceThe results presented here provide some first clues about the molecular and biochemical events that characterize the diapause syndrome in aphid parasitoids. These data are useful for probing potential commonality of parasitoids diapause with other taxa and they will help creating a general understanding of diapause underpinnings and a background for future interpretations.

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Diapause induction in aphid parasitoids

Cited by 54 publications

References 9 publications

Comparative analysis of maternal and grand-maternal photoperiodic responses of Trichogramma species (Hymenoptera: Trichogrammatidae)

Comparative analysis of maternal and grand-maternal photoperiodic responses of Trichogramma species (Hymenoptera: Trichogrammatidae)

Ecological and evolutionary aspects of photothermal regulation of diapause in trichogrammatidae

Metabolic and Proteomic Profiling of Diapause in the Aphid Parasitoid Praon volucre

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