Chemotactic movement in sperm of the oogamous brown algae, Saccharina japonica and Fucus distichus
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- 作者：Nana Kinoshita ; Chikako Nagasato ; Taizo Motomura
- 关键词：Anterior flagellum ; Brown algae ; Chemotaxis ; Flagellar waveform ; Oogamy ; Posterior flagellum ; Sperm
- 刊名：Protoplasma
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：254
- 期：1
- 页码：547-555
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Cell Biology; Plant Sciences; Zoology;
- 出版者：Springer Vienna
- ISSN：1615-6102
- 卷排序：254
文摘
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.