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Development, Vol 121, Issue 12 4171-4182, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

The expression of the Athb-8 homeobox gene is restricted to provascular cells in Arabidopsis thaliana

S Baima, F Nobili, G Sessa, S Lucchetti, I Ruberti and G Morelli
Unita di Nutrizione Sperimentale, Istituto Nazionale della Nutrizione, Rome, Italy.

We have characterized an Arabidopsis homeobox gene coding for a putative DNA binding protein that represents an early marker for vascular development. The full-length cDNA encodes a protein of 833 amino acids that we have designated Athb-8; it contains the conserved DNA binding domain that characterizes the HD-Zip family of transcription factors. RNA analysis showed that the Athb-8 gene is expressed during the vegetative and the reproductive phases of plant growth. A higher steady-state level of the Athb-8 mRNA was found in flowering stem and root. In situ mRNA analysis of Arabidopsis plants demonstrated that Athb-8 expression is restricted to the procambial cells of embryo and developing organs. Moreover, Athb-8-GUS expression was found in single parenchyma cells which are differentiating into tracheary elements in wounded tobacco transgenic plants. Finally, we showed that the auxin, indole-3-acetic acid, which is involved in vascular development and differentiation, modulates the expression of the gene. Taken together, these results suggest that Athb-8 might be a regulator of vascular development in Arabidopsis thaliana.


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