Czech Phycology 6: 135-142, 2006

Negative photomovements of desmid Micrasterias rotata as response to strong light

Negativní fotopohyby u Micrasterias rotata (Desmidiales) jako odpověď na silné světlo

Kamila Trojánková, Pavel Přibyl
Institute of Botany, Academy of Sciences of the Czech Republic, Dukelská 135, CZ-379 82 Třeboň, Czech Republic

We describe two types of photomovement of Micrasterias rotata cells in the presented study. When using relatively high irradiance (145 μmol.m-2.s-1), 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-2.s-1) 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.

Published: March 1, 2006  Show citation

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Trojánková, K., & Přibyl, P. (2006). Negative photomovements of desmid Micrasterias rotata as response to strong light. Czech Phycology, 6(1), 135-142
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