Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hm.....50..117c&link_type=abstract
Helgoländer Meeresuntersuchungen, Volume 50, Issue 1, pp.117-130
Physics
Scientific paper
Every year the Earth's rotation period is reduced, mainly due to the tidal drag of the moon. The length of day increases continuously by about 1 h every 200 million years. The period of rotation around the Sun remains constant; hence, the length of the year remains constant, so years acquire progressively fewer days. Many unicellular algae show rhythmicity in their cell division cycle. If primitive algae evolved under a shorter day duration, then it is possible that the early-evolved algae had to synchronize their cell division cycle to shorter lengths of day than did later-evolved algae. We tested this hypothesis by growing Cyanobacteria, Dinophyceae, Prasinophyceae, Bacillariophyceae and Conjugatophyceae (evolutionary appearance probably in this order) at 8∶8 h light-dark cycles (LD), 10∶10 LD, and 12∶12 LD, at 20 or 27°C. Cyanobacteria synchronized their cell division cycles optimally at 8∶8 h LD, Dinophyceae and Prasinophyceae at 10∶10 h LD, and Conjugatophyceae and Bacillariophyceae at 12∶12 h LD. The synchrony of cell division was scarcely affected by temperature. Results suggested that the early evolved unicellular autotrophic organisms such as the Cyanobacteria synchronized their cell division cycle under a shorter day duration than later-evolved unicellular algae, and these traits may have been conserved by quiescent genes up to the present day.
Aguilera Antonio
Costas E.
González-Gil S.
López-Rodas V.
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