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001-es BibID:BIBFORM073444
035-os BibID:(Scopus)85026906262 (WOS)000406789200009
Első szerző:Sebestyén Flóra (biológus)
Cím:Insulin/IGF Signaling and Life History Traits in Response to Food Availability and Perceived Density in the Cnidarian Hydra vulgaris / Sebestyén Flóra, Póliska Szilárd, Rácz Rita, Bereczki Judit, Lénárt Kinga, Barta Zoltán, Lendvai Z. Ádám, Tökölyi Jácint
Dátum:2017
ISSN:0289-0003
Megjegyzések:Insulin/insulin-like growth factor signaling (IIS) is thought to be a central mediator of life history traits, but the generality of its role is not clear. Here, we investigated mRNA expression levels of three insulin-like peptide genes, the insulin-like receptor htk7, as well as several antioxidant genes, and the heat-shock protein hsp70 in the freshwater cnidarian Hydra vulgaris. Hydra polyps were exposed to a combination of different levels of food and perceived population density to manipulate life history traits (asexual reproduction and oxidative stress tolerance). We found that stress tolerance and the rate of asexual reproduction increased with food, and that these two effects were in significant interaction. Exposing animals to high perceived density resulted in increased stress tolerance or reduced reproduction only on lower food levels, but not on high food. The insulin-like receptor htk7 and the antioxidant gene catalase were significantly upregulated in the high density treatments. However, the expression level of insulin-like peptide genes, most antioxidant genes, and hsp70 were not affected by the experimental treatments. The higher expression level of htk7 may suggest that animals maintain a higher level of preparedness for insulin-like ligands at high population densities. However, the lack of difference between food levels suggests that IIS is not involved in regulating asexual reproduction and stress tolerance in hydra, or that its role is more subtle than a simple model of life history regulation would suggest.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Insulin signaling, Hydra vulgaris
Megjelenés:Zoological Science. - 34 : 4 (2017), p. 318-325. -
További szerzők:Póliska Szilárd (1978-) (biológus) Rácz Rita (1989-) (biológus) Bereczki Judit (1979-) (biológus) Lénárt Kinga (1994-) (biológus) Barta Zoltán (1967-) (biológus, zoológus) Lendvai Ádám Zoltán (1977-) (biológus) Tökölyi Jácint (1984-) (biológus)
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001-es BibID:BIBFORM066149
035-os BibID:(Scopus)84952637768 (WoS)000367196900009
Első szerző:Tökölyi Jácint (biológus)
Cím:Effects of food availability on asexual reproduction and stress tolerance along the fast-slow life history continuum in freshwater hydra (Cnidaria: Hydrozoa) / Jácint Tökölyi, Flóra Bradács, Nikolett Hóka, Noémi Kozma, Máté Miklós, Orsolya Mucza, Kinga Lénárt, Zsófia Ősz, Flóra Sebestyén, Zoltán Barta
Dátum:2015
ISSN:0018-8158
Megjegyzések:Life history theory predicts that reproduction and somatic maintenance are negatively related, but the strength of this relationship is expected to depend on food availability. In this study, we investigated asexual reproduction (budding rate) and oxidative stress tolerance as two opposing facets of life history trade-offs in 17 strains of five freshwater hydra species under experimentally simulated low, medium, and high food availability. Stress tolerance was quantified by exposing animals to exogenous H2O2, which mimics reactive oxygen species arising in vivo. The five species differed in life history traits (low budding rate and high stress tolerance in Hydra vulgaris and H. circumcincta and the opposite in H. oligactis and H. viridissima; low budding rate combined with relatively low stress tolerance in H. oxycnida). Stress tolerance and asexual reproduction increased with food, but there were clear interspecific differences in this relationship. Across all strains, stress tolerance and budding rate were significantly negatively related on the low and medium, but not the high food level. These results suggest that resource allocation trade-offs are involved in determining life history traits in hydra; populations/species can be broadly positioned on a fast-slow life history continuum, and response to variation in food varies along this continuum.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Dietary restriction
Food variability
Hydra
Life history evolution
Resource allocation trade-offs
Megjelenés:Hydrobiologia. - 766 : 1 (2015), p. 121-133. -
További szerzők:Bradács Flóra Hóka Nikolett Kozma Noémi Miklós Máté (1994-) (biológus) Mucza Orsolya Lénárt Kinga (1994-) (biológus) Ősz Zsófia Sebestyén Flóra (1993-) (biológus) Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:SROP-4.2.2.B-15/1/KONV-2015-0001
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