Abstract
The cell division and vegetative growth of the thalli of simply differentiated macroalgae with a diffuse growth type—Ulva pseudocurvata (Chlorophyta) and Porphyra umbilicalis (Rhodophyta)-have been studied under natural and laboratory conditions. For this purpose the mitotic index and growth rate of algae were measured over 18 days. A diurnal rhythm of the mitotic index was revealed: the minimal mitotic index was registered in morning and daylight hours (for U. pseudocurvata 1–4%, for P. umbilicalis 0.5–2%), in the afternoon the index grew and reached its maximum 1 hour before dark (for U. pseudocurvata 12%, for P. umbilicalis 7%), then it slowly decreased during the night. In the studied algal species 2–3-and 6-day rhythms of mitotic index and growth rate were found for the first time both under natural and laboratory conditions. With constant white light these rhythms persisted for 9 days, this confirms the endogenous regulation of these rhythmic variations.
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Original Russian Text © T.L. Kalita, T.V. Titlyanova, E.A. Titlyanov, 2007, published in Biologiya Morya.
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Kalita, T.L., Titlyanova, T.V. & Titlyanov, E.A. New rhythmic changes in mitosis and growth in low differentiated green and red marine macroalgae. Russ J Mar Biol 33, 207–212 (2007). https://doi.org/10.1134/S1063074007040013
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DOI: https://doi.org/10.1134/S1063074007040013