Arabidopsis NPL1: A Phototropin Homolog Controlling the Chloroplast High-Light Avoidance Response

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Science  16 Mar 2001:
Vol. 291, Issue 5511, pp. 2138-2141
DOI: 10.1126/science.291.5511.2138

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Chloroplasts relocate their positions in a cell in response to the intensity of incident light, moving to the side wall of the cell to avoid strong light, but gathering at the front face under weak light to maximize light interception. Here, Arabidopsis thalianamutants defective in the avoidance response were isolated, and the mutated gene was identified as NPL1 (NPH-like 1), a homolog of NPH1 (nonphototropic hypocotyl 1), a blue light receptor used in phototropism. Hence, NPL1 is likely a blue light receptor regulating the avoidance response under strong light.

  • * These authors contributed equally to this work.

  • To whom correspondence should be addressed. E-mail: wada-masamitsu{at}

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