Evidence for equal size cell divisions during gametogenesis in a marine green alga Monostroma angicava.
In cell divisions, relative size of daughter cells should play fundamental roles in gametogenesis and embryogenesis. Differences in gamete size between the two mating types underlie sexual selection. Size of daughter cells is a key factor to regulate cell divisions during cleavage. In cleavage, the form of cell divisions (equal/unequal in size) determines the developmental fate of each blastomere. However, strict validation of the form of cell divisions is rarely demonstrated. We cannot distinguish between equal and unequal cell divisions by analysing only the mean size of daughter cells, because their means can be the same. In contrast, the dispersion of daughter cell size depends on the forms of cell divisions. Based on this, we show that gametogenesis in the marine green alga, Monostroma angicava, exhibits equal size cell divisions. The variance and the mean of gamete size (volume) of each mating type measured agree closely with the prediction from synchronized equal size cell divisions. Gamete size actually takes only discrete values here. This is a key theoretical assumption made to explain the diversified evolution of isogamy and anisogamy in marine green algae. Our results suggest that germ cells adopt equal size cell divisions during gametogenesis.
Marine Biosystems Research Center, Chiba University, Kamogawa 299-5502, Japan.
Tatsuya
T
Togashi
Marine Biosystems Research Center, Chiba University, Kamogawa 299-5502, Japan.
Yusuke
Y
Horinouchi
Department of Mathematics and Informatics, Faculty of Science, Chiba University, Chiba, 263-8522, Japan.
Hironobu
H
Sasaki
Marine Biosystems Research Center, Chiba University, Kamogawa 299-5502, Japan.|Graduate School of Science and Technology, and Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu 432-8561, Japan.|Department of Environmental and Forest Biology, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA.
Jin
J
Yoshimura
D002455:Cell Division / Q000502:physiology*; D048429:Cell Size; D000460:Chlorophyta / Q000166:cytology* / Q000502:physiology*; D005718:Gametogenesis / Q000502:physiology*