Annual development of mat-forming conjugating green algae Zygnema spp. in hydro-terrestrial habitats in the Arctic

0465801 - BÚ 2017 RIV DE eng J - Journal Article
Pichrtová, M. - Hájek, Tomáš - Elster, Josef
Annual development of mat-forming conjugating green algae Zygnema spp. in hydro-terrestrial habitats in the Arctic.
Polar Biology. Roč. 39, č. 9 (2016), s. 1653-1662. ISSN 0722-4060. E-ISSN 1432-2056
R&D Projects: GA MŠMT ME 934; GA MŠMT LA341
Institutional support: RVO:67985939
Keywords : green algae * resting stage * stress tolerance
Subject RIV: EH - Ecology, Behaviour
Impact factor: 1.949, year: 2016

In the Arctic, Zygnema spp. survives harsh periods as modified vegetative cells, i.e., preakinetes, tolerating desiccation during summer and freezing in winter. These cells are not dormant and therefore recover their physiological activity immediately after transfer to favorable conditions, undergoing rapid growth in the early spring. Nevertheless, once preakinetes begin to grow, these newly produced vegetative cells lose stress tolerance. Such rapid dehardening explains their high mortality due to frequent freeze–thaw cycles in the early spring. Arctic Zygnema spp. thus face a phenological trade-off between missing the early growing season and experiencing frost damage.
Permanent Link: http://hdl.handle.net/11104/0264251