New rhythmic changes in mitosis and growth in low differentiated green and red marine macroalgae

New rhythmic changes in mitosis and growth in low differentiated green and red marine macroalgae 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

New rhythmic changes in mitosis and growth in low differentiated green and red marine macroalgae

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Publisher
Nauka/Interperiodica
Copyright
Copyright © 2007 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology; Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074007040013
Publisher site
See Article on Publisher Site

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.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Sep 6, 2007

References

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