PMID: 6399786Jan 1, 1983Paper

The perception of light direction and orientation responses in chloroplasts

Symposia of the Society for Experimental Biology
W Haupt

Abstract

We may summarise what is known, in stationary cells, about perception of light direction. Cells have evolved three different mechanisms to transform light direction into an absorption gradient: light attenuation, light refraction, and dichroic orientation of the photoreceptors. Furthermore, these mechanisms can be combined and can cooperate in the same cell. With the photochromic pigment phytochrome, a regular change in dichroism upon photoconversion is an important improvement for effectively establishing an absorption gradient. However, perception of the direction of light, while a necessary condition, is not solely sufficient for a directional response. Equally important is a strongly localised transduction chain effecting localised control of the intracellular motor apparatus. Slowly-diffusing ions seem to fulfil this requirement, but further work needs to be done to elucidate the mechanisms completely.

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