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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/18203

Cell cycle and cell mortality of Alexandrium minutum (Dinophyceae) under small-scale turbulence conditions

AutorLlaveria, Gisela ; Figueroa, Rosa Isabel ; Garcés, Esther ; Berdalet, Elisa
Palabras claveAlexandrium minutum
Cell cycle
Coulter counter
Flow cytometry
Small-scale turbulence
Fecha de publicaciónsep-2009
EditorBlackwell Publishing
CitaciónJournal of Phycology 45(5): 1106-1115 (2009)
ResumenDecreased net population growth rates and cellular abundances have been observed in dinoflagellate species exposed to small-scale turbulence. Here, we investigated whether these effects were caused by alterations in the cell cycle and/or by cell mortality and, in turn, whether these two mechanisms depended on the duration of exposure to turbulence. The study was conducted on the toxic dinoflagellate Alexandrium minutum Halim, with the same experimental design and setup used in previous studies to allow direct comparison among results. A combination of microscopy and Coulter Counter measurements allowed us to detect cell mortality, based on the biovolume of broken cells and thecae. The turbulence applied during the exponential growth phase caused an immediate transitory arrest in the G2/M phase, but significant mortality did not occur. This finding suggests that high intensities of small-scale turbulence can alter the cell division, likely affecting the correct chromosome segregation during the dinomitosis. When shaking persisted for >4 d, mortality signals and presence of anomalously swollen cells appeared, hinting at the activation of mechanisms that induce programmed cell death. Our study suggests that the sensitivity of dinoflagellates to turbulence may drive these organisms to find the most favorable (calm) conditions to complete their division cycle.
Descripción10 pages, 5 figures, 1 table
Versión del editorhttp://dx.doi.org/10.1111/j.1529-8817.2009.00740.x
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