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Flagellar Motions in Phototactic Steering in a Brown Algal Swarmer

Author:
Matsunaga, Shigeru  Uchida, Hiroko  Iseki, Mineo  Watanabe, Masakatsu  Murakami, Akio  


Journal:
PHOTOCHEMISTRY AND PHOTOBIOLOGY


Issue Date:
2010


Abstract(summary):

Using infrared high-speed video microscopy, we observed light-triggered transitory flagellar motions in flagellate reproductive cells (swarmers) of a brown alga, Scytosiphon lomentaria, under primary helical swimming conditions before and during negative phototactic orientation to unilateral actinic light. The posterior flagellum, which is autofluorescent and thought to be light-sensing, was passively dragged in the dark and exhibited one to several rapid lateral beats during orientation changes for phototactic steering. Notably, a brief cessation of anterior flagellar beating was occasionally observed concomitantly with rapid beats of the posterior flagellum. This behavior caused a pause in helical body rotation, which may contribute to the accuracy of phototactic steering. Thus, coordinated regulation of the movement of the two flagella plays a crucial role in phototactic steering.


Page:
374---381


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