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Flagellar waveforms of gametes in the brown alga Ectocarpus siliculosus

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Title: Flagellar waveforms of gametes in the brown alga Ectocarpus siliculosus
Authors: Kinoshita, Nana Browse this author
Shiba, Kogiku Browse this author
Inaba, Kazuo Browse this author
Fu, Gang Browse this author
Nagasato, Chikako Browse this author
Motomura, Taizo Browse this author →KAKEN DB
Keywords: anterior flagellum
brown algae
flagellar movement
posterior flagellum
Issue Date: May-2016
Publisher: Taylor & Francis
Journal Title: European journal of phycology
Volume: 51
Issue: 2
Start Page: 139
End Page: 148
Publisher DOI: 10.1080/09670262.2015.1109144
Abstract: Brown algae are members of the Stramenopiles and their gametes generally have two heterogeneous flagella: a long anterior flagellum (AF) with mastigonemes and a short posterior flagellum (PF). In this study, swimming paths and flagellar waveforms in free-swimming and thigmotactic-swimming male and female gametes and in male gametes during chemotaxis, were quantitatively analysed in the model brown alga Ectocarpus siliculosus. This analysis was performed using a high-speed video camera. It was revealed that the AF plays a role in changing the locomotion of male and female gametes from free-swimming to thigmotactic-swimming and also in changing the swimming path of male gametes from linear to circular during chemotaxis. In the presence of a sex pheromone, male gametes changed their swimming path from linear (swimming path curvature, 0-0.02 mu m(-1)) to middle and small circular path (swimming path curvature, 0.04-0.20 mu m(-1)). The flagellar asymmetry and the deflection angle of the AF became larger, whereas the oscillation pattern of the AF was stable. However, there was no correlation between the flagellar asymmetry and the deflection angle of the AF and the path curvature when the male gametes showed middle to small circular paths. The PF irregularly changed the deflection angle and the oscillation pattern was unstable depending on the gradient of the sex pheromone concentration. AF waveforms were independent of PF locomotion during chemotaxis. This means that the AF has the ability to change the swimming path of male gametes - for example, from a highly linear path to a circular path - while changes in locomotion from a middle circle path to a small circle path is the result of beating of the PF.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in European Journal of Phycology on 05/2016, available online:
Type: article (author version)
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 本村 泰三

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