heliotaxis(redirected from positive heliotaxis)
Also found in: Dictionary, Encyclopedia.
A form of phototaxis, and perhaps of thermotaxis, in which there is a tendency to growth or movement toward (positive heliotaxis) or away from (negative heliotaxis) the sun or the sunlight.
[helio- + G. taxis, orderly arrangement]
The movement of an organism in response to the light of the sun.
he′li·o·tac′tic (-tăk′tĭk) adj.
heliotaxis(hē-lē-ō-tăk′sĭs) [″ + taxis, arrangement]
A reaction in plants that causes them to respond negatively or positively to sunlight.
A turning away from the sun.
A turning toward the sun.