摘要: Publisher Summary This chapter discusses light responses of motile organisms, light-controlled movement cell organelles, and the concept phototropic photonastic curvatures. Photomovement organisms can belong to either three fundamentally different types, viz., photokinesis, photophobic response, phototaxis. Photokinesis is steady-state velocity that depends on intensity (fluence rate) light, ideally in a well-defined function without hysteresis. requires no adaptation occurs; response independent time pattern fluence rate. In upon change rate, transient observed, frequently starting with stop comprising reversal movement. phototaxis, direction controlled by direction, but has influence. The final result, accumulation as oriented respect source, be based mechanisms. diversity concerns perception well response. There are types organelles: (1) photodinesis, which control rotational cytoplasm, usually including chloroplasts; (2) orientational chloroplasts, results rearrangement or repositioning these organelles direction; (3) induction polarity, where redistributed direction.
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