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Development, Vol 127, Issue 17 3655-3669, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
E Scarpella, S Rueb, KJ Boot, JH Hoge and AH Meijer
Institute of Molecular Plant Sciences, Leiden University, Clusius Laboratory, PO Box 9505, The Netherlands.
The vascular tissues of plants form a network of interconnected cell files throughout the plant body. The transition from a genetically totipotent meristematic precursor to different stages of a committed procambial cell, and its subsequent differentiation into a mature vascular element, involves developmental events whose molecular nature is still mostly unknown. The rice protein Oshox1 is a member of the homeodomain leucine zipper family of transcription factors. Here we show that the strikingly precise onset of Oshox1 gene expression marks critical, early stages of provascular ontogenesis in which the developmental fate of procambial cells is specified but not yet stably determined. This suggests that the Oshox1 gene may be involved in the establishment of the conditions required to restrict the developmental potential of procambial cells. In support of this hypothesis, ectopic expression of Oshox1 in provascular cells that normally do not yet express this gene results in anticipation of procambial cell fate commitment, eventually culminating in premature vascular differentiation. Oshox1 represents the first example of a transcription factor whose function can be linked to specification events mediating provascular cell fate commitment.
This article has been cited by other articles:
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  S. K. Floyd, C. S. Zalewski, and J. L. Bowman Evolution of Class III Homeodomain-Leucine Zipper Genes in Streptophytes Genetics, May 1, 2006; 173(1): 373 - 388. [Abstract] [Full Text] [PDF]
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 E. Scarpella, E. J. Simons, and A. H. Meijer Multiple Regulatory Elements Contribute to the Vascular-specific Expression of the Rice HD-Zip Gene Oshox1 in Arabidopsis Plant Cell Physiol., August 1, 2005; 46(8): 1400 - 1410. [Abstract] [Full Text] [PDF]
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 E. Scarpella, S. Rueb, and A. H. Meijer The RADICLELESS1 gene is required for vascular pattern formation in rice Development, February 15, 2003; 130(4): 645 - 658. [Abstract] [Full Text] [PDF]
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 E. Scarpella, K. J.M. Boot, S. Rueb, and A. H. Meijer The Procambium Specification Gene Oshox1 Promotes Polar Auxin Transport Capacity and Reduces Its Sensitivity toward Inhibition Plant Physiology, November 1, 2002; 130(3): 1349 - 1360. [Abstract] [Full Text] [PDF]
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K. Ohashi-Ito, T. Demura, and H. Fukuda Promotion of Transcript Accumulation of Novel Zinnia Immature Xylem-Specific HD-Zip III Homeobox Genes by Brassinosteroids Plant Cell Physiol., October 15, 2002; 43(10): 1146 - 1153. [Abstract] [Full Text] [PDF]
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C. Nishitani, T. Demura, and H. Fukuda Primary Phloem-Specific Expression of a Zinnia elegans Homeobox Gene Plant Cell Physiol., November 1, 2001; 42(11): 1210 - 1218. [Abstract] [Full Text] [PDF]
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