RT Journal Article
SR Electronic
A1 Trojánková, Kamila
A1 Přibyl, Pavel
T1 Negative photomovements of desmid Micrasterias rotata as response to strong light
JF Czech Phycology
YR 2006
VO 6
IS 1
SP 135
OP 142
UL https://fottea.czechphycology.cz/artkey/fot-200601-0011.php
AB We describe two types of photomovement of Micrasterias rotata cells in the presented study. When using relatively high irradiance (145 μmol.m<sup>-2</sup>.s<sup>-1</sup>), about 30 % of tested cells reacted by negative phototaxis (gliding) or by rising to avoid strong incident light. No marked responses were recorded under lower irradiance (15 μmol.m<sup>-2</sup>.s<sup>-1</sup>) and in the darkness. Alternation of higher and lower irradiances resulted in a rising - laying down cycle. Moreover, light responses of this cycle markedly delayed when repeating irradiances alternation. Thus, for both tested photomovements we have observed primarily negative response of Micrasterias rotata cells, suggesting an adaptation to low light intensities habitats of this species.