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First published online December 1, 2003

Development 130, 2602e (2003)
© The Company of Biologists Limited
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In this issue

At the root of plant epidermal development


An experimentally tractable system for investigating cell-fate determination in plants is the specification of the predictable pattern of hair and non-hair cells seen in the Arabidopsis root epidermis. Several putative transcriptional regulators have been implicated in this process and, on p. 6431, Bernhardt et al. report that two Arabidopsis genes encoding basic helix-loop-helix proteins - GLABRA3 (GL3) and ENHANCER OF GLABRA3 (EGL3) - act in a partly redundant manner during the specification of root epidermal cells. No non-hair cells were formed in plants carrying homozygous null mutations in both genes. Conversely, overexpression of either gene produced ectopic non-hair cells. Other results indicate that GL3/EGL3 also influence hair cell specification, leading the researchers to propose a model in which interactions between GL3/EGL3 and the MYB proteins WEREWOLF and CAPRICE mediate cell-fate decision during the development of the root epidermis.


Related articles in Development:

The bHLH genes GLABRA3 (GL3) andENHANCER OF GLABRA3 (EGL3) specify epidermal cell fate in the Arabidopsis root
Christine Bernhardt, Myeong Min Lee, Antonio Gonzalez, Fan Zhang, Alan Lloyd, and John Schiefelbein
Development 2003 130: 6431-6439. [Abstract] [Full Text]  




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