Destruction of maternal centrioles during fertilization of the brown alga, Scytosiphon lomentaria (Scytosiphonales, Phaeophyceae)

Cell Motility and the Cytoskeleton
Chikako Nagasato, Taizo Motomura

Abstract

In brown algal fertilization, a pair of centrioles is derived from the male gamete, irrespective of the sexual reproduction pattern, i.e., isogamy, anisogamy, or oogamy. In this study, the manner in which the maternal centriole structure is destroyed in early zygotes of the isogamous brown alga Scytosiphon lomentaria was examined by electron microscopy. At fertilization, the zygote had two pairs of centrioles (flagellar basal bodies) derived from motile male and female gametes, and there was no morphological difference between the two pairs. The flagellar basal plate and the axonemal microtubules were still connected with the distal end of centrioles. Ultrastructural observations showed that the integrity of maternal-derived centrioles began to degenerate even in the 1-h-old zygote. At that time, the cylinder of triplet microtubules of the maternal centrioles became shorter from the distal end, and a section passing through the centrioles indicated that a part of the nine triplets of microtubules changed into doublet or singlet microtubules by degeneration of B and/or C tubules. In 2-h-old zygote, there was no trace of maternal centrioles ultrastructurally, and only the paternal centrioles remained. Further, reduction of centri...Continue Reading

References

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Citations

Nov 4, 2005·Journal of Plant Research·Chikako Nagasato
Feb 11, 2010·Journal of Plant Research·Taizo MotomuraKei Kimura
Sep 5, 2014·Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis·Feng Liu, Shaojun Pang
Mar 11, 2008·Progress in Retinal and Eye Research·Philipp TrojanUwe Wolfrum

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