Abstract
In oogamous species of brown algae such as Saccharina japonica and Fucus distichus, the sperm possess an unusual long posterior flagellum, which oscillates actively and produces a propulsive force during swimming. In this study, we quantitatively analyzed the effect of chemotactic responses on sperm swimming and flagellar waveforms by high-speed video recordings. We found that the thigmotactic response to the chemo-attractant was not enhanced during chemotactic swimming and that the swimming velocity of sperm did not decrease. As concentration of the chemo-attractant decreased, the sperm performed drastic U-turn movements, which was caused by a rapid and large bend of the posterior flagellum. Unilateral bending of the posterior flagellum when sensing a decrease in the concentration of the chemo-attractant may be a common response in male gametes during fertilization of brown algae both oogamous and isogamous species.
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Acknowledgments
We sincerely thank Drs. Kogiku Shiba and Kazuo Inaba of the Shimoda Marine Research Center, University of Tsukuba, who kindly provided many valuable comments.
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Sup. Movie 1
Release of sperm by S. japonica. (AVI 6356 kb)
Sup. Movie 2
Abnormal sperm lacking AF in S. japonica. (AVI 3605 kb)
Sup. Movie 3
U-turn by S. japonica sperm. (AVI 1843 kb)
Sup. Movie 4
U-turn by F. distichus sperm. (AVI 11065 kb)
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Kinoshita, N., Nagasato, C. & Motomura, T. Chemotactic movement in sperm of the oogamous brown algae, Saccharina japonica and Fucus distichus . Protoplasma 254, 547–555 (2017). https://doi.org/10.1007/s00709-016-0974-y
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DOI: https://doi.org/10.1007/s00709-016-0974-y