The survival and molting incidence were studied in the insect. Panstrongylus megistus, following sequential ci,ld shocks in which a milder shock at 0 or 5 degreesC for 1 h preceded a more severe shock (0 degreesC. 12 h). The shocks were separated by intervals of 8. 18. 24. and 72 h at 28 degreesC....

The survival and molting incidence were studied in the insect. Panstrongylus megistus, following sequential ci,ld shocks in which a milder shock at 0 or 5 degreesC for 1 h preceded a more severe shock (0 degreesC. 12 h). The shocks were separated by intervals of 8. 18. 24. and 72 h at 28 degreesC. The survival rate after sequential shocks was identical to that of unshocked controls. Cold-shock tolerance differed from heat-shock tolerance since the latter varied with the time between shocks and was much more transient. Sequential cold shocks produced a higher molting incidence when the first shock was given at 0 compared to 5 degreesC. This response was more rapid than that to sequential heat shocks. Cold-shock tolerance in P. megistus may involve heat-shock proteins, although other protective mechanisms may also occur concurrently. This is the first report of cold-shock tolerance in a bloodsucking sucking hemipteran. (C) 2001 Academic Press.

The survival and molting incidence were studied in the insect. Panstrongylus megistus, following sequential ci,ld shocks in which a milder shock at 0 or 5 degreesC for 1 h preceded a more severe shock (0 degreesC. 12 h). The shocks were separated by intervals of 8. 18. 24. and 72 h at 28 degreesC....

The survival and molting incidence were studied in the insect. Panstrongylus megistus, following sequential ci,ld shocks in which a milder shock at 0 or 5 degreesC for 1 h preceded a more severe shock (0 degreesC. 12 h). The shocks were separated by intervals of 8. 18. 24. and 72 h at 28 degreesC. The survival rate after sequential shocks was identical to that of unshocked controls. Cold-shock tolerance differed from heat-shock tolerance since the latter varied with the time between shocks and was much more transient. Sequential cold shocks produced a higher molting incidence when the first shock was given at 0 compared to 5 degreesC. This response was more rapid than that to sequential heat shocks. Cold-shock tolerance in P. megistus may involve heat-shock proteins, although other protective mechanisms may also occur concurrently. This is the first report of cold-shock tolerance in a bloodsucking sucking hemipteran. (C) 2001 Academic Press.

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

1998/0826-4; 1999/2547-8

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