CUE1: A Mesophyll Cell-Specific Positive Regulator of Light-Controlled Gene Expression in Arabidopsis

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Article on CUE1 and a mesophyll cell-specific positive regulator of light-controlled gene expression in Arabidopsis.

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12 p.

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Li, Hsou-min; Culligan, Kevin M.; Dixon, R. A. & Chory, Joanne October 1, 1995.

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Article on CUE1 and a mesophyll cell-specific positive regulator of light-controlled gene expression in Arabidopsis.

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12 p.

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Abstract: Light plays a key role in the development and physiology of plants. One of the most profound effects of light on plant development is the derepression of expression of an array of light-responsive genes, including the genes encoding the chlorophyll a/b binding proteins (CAB) of photosystem II. To understand the mechanism by which light signals nuclear gene expression, we developed a genetic selection to identify mutants with reduced CAB transcription. Here, we describe a new Arabidopsis locus, CUE1 (for CAB underexpressed). Mutations at this locus result in defects in expression of several light-regulated genes, specifically in mesophyll but not in bundle-associated or epidermis cells. Reduced accumulation of CAB and other photosynthesis-related mRNAs in the mesophyll was correlated with defects in chloroplast development in these cells, resulting in a reticulate pattern with veins greener than the interveinal regions of leaves. Moreover, chalcone synthase mRNA, although known to be regulated by both phytochrome and a blue light receptor, accumulated normally in the leaf epidermis. Dark basal levels of CAB expression were unaffected in etiolated cue1 seedlings; however, induction of CAB transcription by pulses of red and blue light was reduced, suggesting that CUE1 acts downstream from both phytochrome and blue light photoreceptors. CUE1 appears to play a role in the primary derepression of mesophyll-specific gene expression in response to light, because cue1 mutants are severely deficient at establishing photoautotrophic growth. Based on this characterization, we propose that CUE1 is a cell-specific positive regulator linking light and intrinsic developmental programs in Arabidopsis leaf mesophyll cells.

© 1995 American Society of Plant Biologists.

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  • The Plant Cell, 1995, Rockville: American Society of Plant Biologists, pp. 1599-1610

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  • Publication Title: The Plant Cell
  • Volume: 7
  • Issue: 10
  • Page Start: 1599
  • Page End: 1610
  • Pages: 12
  • Peer Reviewed: Yes

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  • October 1, 1995

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  • July 9, 2015, 6:19 a.m.

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Li, Hsou-min; Culligan, Kevin M.; Dixon, R. A. & Chory, Joanne. CUE1: A Mesophyll Cell-Specific Positive Regulator of Light-Controlled Gene Expression in Arabidopsis, article, October 1, 1995; [Rockville, Maryland]. (digital.library.unt.edu/ark:/67531/metadc674069/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.