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- W2055175592 abstract "Temperature shock to early pupae causes wing color-pattern changes in butterflies. These plastic changes are ascribed to the hemolymph level of the cold-shock hormone (CSH) in pupae as well as to other mechanisms. Here, we characterized heat-shock-induced color-pattern changes using the blue pansy butterfly Junonia orithya (Lepidoptera: Nymphalidae). In response to the 38–42 °C heat-shock treatments, parafocal elements (PFEs) were thinned and dislocated away from eyespots; this was the reverse of the direction of the cold-shock-induced changes. Somewhat surprisingly, in response to the lethal 44 °C heat shock, PFEs were modified as in the case of a cold-shock. These modifications were not affected by the removal of the head-prothorax portion of pupae. While the hemolymph-mediated transfer of the possible PFE-modification property induced by the 42 °C treatment was unsuccessful in the parabiosis experiment, the transfer of the factor induced by the 44 °C treatment was successful. In contrast, reduction of the blue background area was obtained not only by the 42 and 44 °C treatments but also by the injection of thapsigargin, a plant-derived stress inducer, in males. The result of this treatment was similar to the natural color patterns of other closely related Junonia species. We also observed an increase in orange coloration by the 42 °C treatment in females, and this change was similar to ecdysteroid-induced modifications. Taken together, the heat-shock-induced PFE modifications in J. orithya can be explained by the levels of CSH, and other modifications are likely to be caused by general stress responses and ecdysteroid effects. We conclude that phenotypic plasticity of the wing color patterns to heat shock results from a combined effect of at least a few different mechanisms. These mechanisms might have been exploited in the color-pattern evolution of some Junonia species." @default.
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- W2055175592 date "2011-08-01" @default.
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- W2055175592 title "Heat-shock-induced color-pattern changes of the blue pansy butterfly Junonia orithya: Physiological and evolutionary implications" @default.
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- W2055175592 doi "https://doi.org/10.1016/j.jtherbio.2011.06.002" @default.
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