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Titolo:
Enhanced drought tolerance of a soil-dwelling springtail by pre-acclimation to a mild drought stress
Autore:
Sjursen, H; Bayley, M; Holmstrup, M;
Indirizzi:
Natl Environm Res Inst, Dept Terr Ecol, DK-8600 Silkeborg, Denmark Natl Environm Res Inst Silkeborg Denmark DK-8600 8600 Silkeborg, Denmark
Titolo Testata:
JOURNAL OF INSECT PHYSIOLOGY
fascicolo: 9, volume: 47, anno: 2001,
pagine: 1021 - 1027
SICI:
0022-1910(200108)47:9<1021:EDTOAS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVAPORATIVE WATER-LOSS; DROSOPHILA-MELANOGASTER; ANHYDROBIOSIS; TREHALOSE; DESICCATION; NEMATODES; SURVIVAL; ACCUMULATION; MYOINOSITOL; COLLEMBOLAN;
Keywords:
springtail; desiccation; acclimation; water content; sugar; polyol;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Sjursen, H Natl Environm Res Inst, Dept Terr Ecol, Vejlsovej 25,POB 314, DK-8600 Silkeborg, Denmark Natl Environm Res Inst Vejlsovej 25,POB 314 Silkeborg Denmark DK-8600
Citazione:
H. Sjursen et al., "Enhanced drought tolerance of a soil-dwelling springtail by pre-acclimation to a mild drought stress", J INSECT PH, 47(9), 2001, pp. 1021-1027

Abstract

The springtail Folsomia candida has a highly permeable cuticle, but is able to survive several weeks at 98.2%RH. This corresponds to a water potential deficit of about 17 bars between the environment and the normal osmotic pressure of the body fluids of this animal. Recent studies have shown a water vapour absorption mechanism by accumulation of sugars and polyols (SP) inF. candida, which explains how this species can survive dehydrating conditions. In the present study, adult F. candida were pre-acclimated at 98.2%RHto induce the accumulation of SP, and were subsequently exposed for additional desiccating conditions from 98 to 94%RH. Activity level, water content, osmotic pressure of body fluids and SP composition were investigated. After the desiccation period, the animals were rehydrated at 100%RH and survival was assessed. The results showed that F. candida survived a more severe drought stress when it had been pre-acclimated to 98.2%RH before exposure to lower humidity. This species was able to maintain hyperosmosity to the surroundings at 95.5%RH, suggesting that it can absorb water vapour down to this limit. Below this limit, trehalose levels increased while myo-inositol levels decreased. We propose that this is a change of survival strategy where F. candida at mild desiccation levels seek to retain water by colligative means (remain hyperosmotic), but at severe desiccation levels switches toan anhydrobiotic strategy. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 05:43:29