Prolonged thermotolerance in the flesh fly, Sarcophaga crassipalpis, does not require continuous expression or persistence of the 72 kDa heat-shock protein

Thermotolerance and rapid cold hardening ameliorate the negative effects of brief exposures to high or low temperatures on fecundity in the flesh fly, Sarcophaga crassipalpis

“…Although oogenesis involves the developmental regulation of heat shock proteins as well (Zimmerman et al, 1983), thermoprotection of the ovaries did occur, with pre-treatment leading to the partial restoration of female fecundity in this and other species (Krebs & Loeschcke, 1994;Maisonhaute et al, 1999). Of additional interest, induced thermotolerance lasts for at least 4 h, whereas hsp23 and hsp70 expression lasts for only 2 h after such a treatment Rinehart et al, 2000), suggesting that other mechanisms may be involved in thermotolerance, as has been previously suggested (Yocum & Denlinger, 1992).…”

“…Although the induction of thermotolerance does lead to greater survivorship to adulthood (Yocum & Denlinger, 1992), which would thereby increase the reproductive potential of a naturally occurring population, the problem of male sterility would still be encountered. It would therefore be counterintuitive to develop a system of induced thermotolerance that does not protect the gonads from injury.…”

“…A signi®cant element in the response to temperature extremes is the upregulation of heat shock proteins (Feder & Hofmann, 1999), a group of proteins that are upregulated by environmental stress as well as during speci®c periods of development. Although thermotolerance is sometimes manifested in the absence of these proteins (Yocum & Denlinger, 1992;Dahlgaard et al, 1998), they are clearly upregulated at 40°C in S. crassipalpis Rinehart et al, 2000) and their presence can lead to protection from thermal injury (Feder & Hoffman, 1999). However, their function during stress in the testes appears to be altered because some heat shock proteins are expressed as a function of normal spermatogenesis; hsp70 is involved in mammalian models (Eddy, 1999), and members of the small heat shock protein family are involved in developing testes of D. melanogaster (Michaud et al, 1997).…”

Effect of temperature and food quality on variability of fitness components and physiology of digestion in the gypsy moth larvae Lymantria dispar L.

“…Ukoliko nepovoljne temperature duže traju, fiziološki mehanizmi su presudni u obezbedjivanju preživljavanja. Kratkotrajno izlaganje umereno visokim temperaturama, koje štiti organizam od kasnijeg oštećenja izazvanog stresom većeg intenziteta, odnosi se na temperaturnu toleranciju i u njenoj osnovi nalazi se sinteza Hsp (Yocum & Denlinger, 1992;Hoffmann et al, 2003). Aklimacija se definiše kao fiziološki, biohemijski ili anatomski odgovor individualnog organizma koji nastaje kao rezultat hroničnog izlaganja eksperimentalno izazvanim uslovima (Randall et al, 2000).…”

“…U okviru vrste, temperaturna tolerancija se značajno menja zavisno od stupnja u razviću (Chen et al 1991;Bowler & Terblanche, 2008;Marais et al, 2009), kvaliteta hrane (Hall et al, 2000;Andersen et al, 2010;Fisher et al, 2010a;Verdu´et al, 2010), međugeneracijske plastičnosti (materinski efekat) (Mousseau & Fox, 1998), fotoperioda (Fisher et al, 2012), imuniteta, uticaja patogena i parazita (Thomson et al, 2005;Lee et al, 2006b). Sposobnost organizma da se aklimatizuje povećava preživljavanje (Yocum & Denlinger, 1992;Beckett & Evans, 1997;Hoffmann et al, 2003;Zhao & Jones, 2012), poboljšava reproduktivni potencijal (Rinehart et al, 2008), kretanje (Deere & Chown, 2006) i menja osobine rezistentnosti na stres (Sorensen et al, 2001;Wang et al, 2005;Sorensen & Loeschcke, 2007Weldon et al, 2011).…”