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Publicação
Heat shock proteins expression and survival at fluctuating high temperature in the larvae of two moth species, Helicoverpa armigera and Thaumetopoea pityocampa
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Orientador(es)
Resumo(s)
Thermal stress is a critical factor when assessing responses of organisms and populations to global warming. Understanding responses
to upper lethal temperature is critical to predict the effect of heat waves on populations. On the other hand, it is important
to understand physiological traits allowing populations to adapt to changes in temperature. Here we compare survival to high
temperatures of two moth species: a Mediterranean species Thaumetopoea pityocampa (Denis et Schiffermuller) and the broadly
distributed Helicoverpa armigera (Hubner). Larvae were exposed to thermal stress, mimicking heat waves with daily maximum
temperature (Tmax) up to 45 °C. Control groups were kept at 25 °C. The changes in two heat shock proteins HSP70 and HSP90
were further studied for the second and third larval stages of T. pityocampa and H. armigera, respectively. An increase in mortality
was observed on T. pityocampa larvae for Tmax above 38 °C. On the contrary, larvae of H. armigera survived well up to 44 °C
Tmax, but survival decreased abruptly at 45 °C Tmax. Thus, the two species differ by 6 °C on their upper threshold. For H. armigera
HSP70 and HSP90 were both inducible by temperatures above 38 °C, steeply increasing with temperature which may account for
superior adaptation to upper temperatures. In T. pityocampa HSP70 and HSP90 occurred constitutively in the control at 25 °C and
did not increase with temperature. Results evidence major differences in HSP expression between species, which might account
for differences in larval survival at the upper thermal limits
Descrição
Palavras-chave
heat tolerance heat shock proteins (HSP) global warming thermal adaptation heat waves
Contexto Educativo
Citação
Bulletin of Insectology 72 (1): 61-68, 2019
Editora
Department of Agricultural and Food Sciences, Entomology, Alma Mater Studiorum Bologna University