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Science 2 November 2001:
Vol. 294. no. 5544, p. 953
DOI: 10.1126/science.294.5544.953l
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This Week in Science

Light perception in plants is mediated by photoreceptors called phytochromes for the red/far-red portions of the spectrum. Sweere et al. (p. 1108) show that the first component in the signal transduction pathway for phytochrome B in Arabidopsis is the response regulator ARR4. Phytochrome B regulates the expression of ARR4, which in turn interacts with phytochrome B to further light signaling. Hormone-regulated expression of ARR4 and the effect of phosphorylation on its function suggest how the light signaling pathway may interact with other signaling pathways.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)