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Thermal tolerance and heat shock proteins in encysted embryos of Artemia from widely different thermal habitats Clegg, J.S.; Hoa, N.V.; Sorgeloos, P. (2001). Thermal tolerance and heat shock proteins in encysted embryos of Artemia from widely different thermal habitats. Hydrobiologia 466(1-3): 221-229. dx.doi.org/10.1023/A:1014580612237 In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158; e-ISSN 1573-5117

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 98753 [ download pdf ]

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Trefwoorden

Biology > Physiology > Animal physiology Chemical compounds > Organic compounds > Proteins Cysts Developmental stages > Embryos Environmental effects > Temperature effects > Heat shock Enzymatic activity Properties > Biological properties > Tolerance > Temperature tolerance Artemia Leach, 1819 [WoRMS]; Artemia franciscana Kellog, 1906 [WoRMS]; Artemia tibetiana Abatzopoulos, Zhang & Sorgeloos, 1998 [WoRMS] Indo-Pacific North East [Marine Regions] Brak water; Zoet water

Author keywords

Artemia; thermal adaptation; heat shock; stress proteins; Hsp-70; p26; artemin

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Auteurs		Top
Clegg, J.S. Hoa, N.V. Sorgeloos, P.

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Abstract

Encysted embryos (cysts) of the brine shrimp, Artemia provide an excellent model system for the study of biochemical adaptation to environmental extremes. Here, we describe an experiment in which cysts of A. franciscana from the San Francisco Bay (SFB), California, U.S.A., were inoculated into experimental ponds in the Mekong Delta region of Vietnam where water temperatures are much higher than the SFB. Cysts produced in each of three successive growing seasons (1996-1998) were collected and examined in the laboratory for resistance to high temperature and relative contents of three stress proteins (Hsp-70, artemin and p26). Thermal adaptation took place rapidly, during the first growing season. The increase in thermal tolerance was reflected in an overall increase in stress protein content, compared to SFB cysts used for the initial inoculation. Also examined were cysts of A. tibetiana collected from a lake on the high plateau of Tibet, PR China, almost 4.5 km above sea level. These cysts were very sensitive to high temperatures, and contained much lower levels of all stress proteins examined, compared to A. franciscana cysts from SFB and Vietnam. Cysts of A. sinica, collected from a hypersaline lake in Inner Mongolia, PR China, were examined in the same fashion and found to be similar to SFB cysts in terms of thermal resistance and stress protein content. The harsh environments in which Artemia are found, and the great diversity of its habitats, world-wide, provide excellent opportunities to relate the ecological setting of an organism to the underlying physiological and biochemical processes enabling its survival.

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