Chemotactic movement in sperm of the oogamous brown algae, Saccharina japonica and Fucus distichus
Chemotactic movement in sperm of the oogamous brown algae, Saccharina japonica and Fucus distichus
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DOI：
10.1007/s00709-016-0974-y
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发表时间：
2017-01-01
期刊：
影响因子：
2.9
通讯作者：
Motomura, Taizo
中科院分区：
文献类型：
--
作者：
Kinoshita, Nana;Nagasato, Chikako;Motomura, Taizo
在褐藻的卵受精物种中，如日本藻和墨角藻，精子拥有一个不寻常的长后鞭毛，它在游泳时活跃地振荡并产生推进力。在这项研究中，我们定量分析了趋化反应的影响，精子游泳和鞭毛波形的高速录像。我们发现，趋化游泳过程中，对化学引诱剂的趋触反应并没有增强，精子的游泳速度也没有降低。随着化学引诱剂浓度的降低，精子进行剧烈的U形转弯运动，这是由后鞭毛的快速和大的弯曲引起的。单侧弯曲的后鞭毛时，感觉到的化学引诱剂的浓度降低可能是一个共同的反应，在受精过程中的褐藻卵受精和同花受精的物种的雄性配子。
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.