A steering mechanism for phototaxis in Chlamydomonas
A steering mechanism for phototaxis in Chlamydomonas
复制标题
DOI：
10.1098/rsif.2014.1164
复制
发表时间：
2015-03-06
影响因子：
3.9
通讯作者：
Golestanian, Ramin
中科院分区：
文献类型：
--
作者：
Bennett, Rachel R.;Golestanian, Ramin
衣藻具有正趋光性和负趋光性。它在赤道附近只有一个眼点，当细胞在向前运动时旋转时，眼点接收到的光信号会发生变化。我们使用衣藻的一个简单的机械模型，将鞭毛节拍模式与眼点的光强度结合起来，以演示与观察一致的趋光转向机制。模型中的趋光性方向由一个参数控制，转向机构对噪声具有较强的鲁棒性。我们的模型展示了在灯光亮起时的定向趋光性和黑暗中的奔跑翻滚行为之间的切换。
Chlamydomonas shows both positive and negative phototaxis. It has a single eyespot near its equator, and as the cell rotates during the forward motion, the light signal received by the eyespot varies. We use a simple mechanical model of Chlamydomonas that couples the flagellar beat pattern to the light intensity at the eyespot to demonstrate a mechanism for phototactic steering that is consistent with observations. The direction of phototaxis is controlled by a parameter in our model, and the steering mechanism is robust to noise. Our model shows switching between directed phototaxis when the light is on and run-and-tumble behaviour in the dark.