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Diapause in the pea aphid (Acyrthosiphon pisum) is a slowing but not a cessation of development.

Shingleton AW, Sisk GC, Stern DL - BMC Dev. Biol. (2003)

Bottom Line: We found that early stages of embryogenesis progressed at a temperature-independent rate, characteristic of diapause, whereas later stages of embryogenesis progressed at a temperature-dependent rate.Rather, morphological development progressed slowly but continuously throughout embryogenesis.This suggests that the mechanisms limiting developmental rate during diapause may be the same as those controlling developmental rate at other stages of growth.

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Affiliation: Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA. ashingle@princeton.edu

ABSTRACT

Background: Many insects undergo a period of arrested development, called diapause, to avoid seasonally recurring adverse conditions. Whilst the phenology and endocrinology of insect diapause have been well studied, there has been comparatively little research into the developmental details of diapause. We investigated developmental aspects of diapause in sexually-produced embryos of the pea aphid, Acyrthosiphon pisum.

Results: We found that early stages of embryogenesis progressed at a temperature-independent rate, characteristic of diapause, whereas later stages of embryogenesis progressed at a temperature-dependent rate. However, embryos maintained at very high temperatures during the temperature-independent stage showed severe developmental abnormalities. Under no temperature regime did embryos display a distinct resting stage. Rather, morphological development progressed slowly but continuously throughout embryogenesis.

Conclusion: Diapause in the pea aphid, and perhaps in many other insects, is a temperature-independent slowing but not a cessation of morphological development. This suggests that the mechanisms limiting developmental rate during diapause may be the same as those controlling developmental rate at other stages of growth.

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Change in mean length of body and third thoracic leg with age (days) in embryos maintained at 0–4°C and then transferred from 0–4°C to 16°C at day 49.
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Figure 7: Change in mean length of body and third thoracic leg with age (days) in embryos maintained at 0–4°C and then transferred from 0–4°C to 16°C at day 49.

Mentions: Transferring aphids from 0–4°C to 16°C on day 49 resulted in almost immediate katatrepsis followed by a rapid completion of development (figure 7). Aphids began to hatch four days after transfer (mean = 6.8 days, S.D. = 1.4), with 49% of eggs hatching (n = 260).


Diapause in the pea aphid (Acyrthosiphon pisum) is a slowing but not a cessation of development.

Shingleton AW, Sisk GC, Stern DL - BMC Dev. Biol. (2003)

Change in mean length of body and third thoracic leg with age (days) in embryos maintained at 0–4°C and then transferred from 0–4°C to 16°C at day 49.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC184428&req=5

Figure 7: Change in mean length of body and third thoracic leg with age (days) in embryos maintained at 0–4°C and then transferred from 0–4°C to 16°C at day 49.
Mentions: Transferring aphids from 0–4°C to 16°C on day 49 resulted in almost immediate katatrepsis followed by a rapid completion of development (figure 7). Aphids began to hatch four days after transfer (mean = 6.8 days, S.D. = 1.4), with 49% of eggs hatching (n = 260).

Bottom Line: We found that early stages of embryogenesis progressed at a temperature-independent rate, characteristic of diapause, whereas later stages of embryogenesis progressed at a temperature-dependent rate.Rather, morphological development progressed slowly but continuously throughout embryogenesis.This suggests that the mechanisms limiting developmental rate during diapause may be the same as those controlling developmental rate at other stages of growth.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA. ashingle@princeton.edu

ABSTRACT

Background: Many insects undergo a period of arrested development, called diapause, to avoid seasonally recurring adverse conditions. Whilst the phenology and endocrinology of insect diapause have been well studied, there has been comparatively little research into the developmental details of diapause. We investigated developmental aspects of diapause in sexually-produced embryos of the pea aphid, Acyrthosiphon pisum.

Results: We found that early stages of embryogenesis progressed at a temperature-independent rate, characteristic of diapause, whereas later stages of embryogenesis progressed at a temperature-dependent rate. However, embryos maintained at very high temperatures during the temperature-independent stage showed severe developmental abnormalities. Under no temperature regime did embryos display a distinct resting stage. Rather, morphological development progressed slowly but continuously throughout embryogenesis.

Conclusion: Diapause in the pea aphid, and perhaps in many other insects, is a temperature-independent slowing but not a cessation of morphological development. This suggests that the mechanisms limiting developmental rate during diapause may be the same as those controlling developmental rate at other stages of growth.

Show MeSH
Related in: MedlinePlus