Ectopic Expression of the Arabidopsis AtMYB23 Gene Induces Differentiation of Trichome Cells

Ectopic Expression of the Arabidopsis AtMYB23 Gene Induces Differentiation of Trichome Cells The control of epidermal cell fate is a complex molecular process and requires the regulatory activity of different transcription factors. Here, we describe the isolation of a member of the Arabidopsis MYB transcription factor family, AtMYB23 , that is involved in trichome development. Expression of the AtMYB23 gene under the control of the viral CaMV 35S promoter causes the development of ectopic trichomes. The formation of ectopic trichomes depends on TRANSPARENT TESTA GLABRA1 but not on GLABRA1 . The absence of the negative regulator TRIPTYCHON leads to branching of the ectopic trichomes on cotyledons and the formation of ectopic trichomes in the leaf subepidermal cell layer. The CaMV 35S promoter-controlled expression of AtMYB23 can partially rescue the glabra1 mutant phenotype. Together, the presented data indicate that the AtMYB23 gene has partially overlapping functions with GLABRA1 in controlling the initiation of trichome development. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Developmental Biology Elsevier

Ectopic Expression of the Arabidopsis AtMYB23 Gene Induces Differentiation of Trichome Cells

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Publisher
Elsevier
Copyright
Copyright © 2001 Academic Press
ISSN
0012-1606
eISSN
1095-564X
D.O.I.
10.1006/dbio.2001.0287
Publisher site
See Article on Publisher Site

Abstract

The control of epidermal cell fate is a complex molecular process and requires the regulatory activity of different transcription factors. Here, we describe the isolation of a member of the Arabidopsis MYB transcription factor family, AtMYB23 , that is involved in trichome development. Expression of the AtMYB23 gene under the control of the viral CaMV 35S promoter causes the development of ectopic trichomes. The formation of ectopic trichomes depends on TRANSPARENT TESTA GLABRA1 but not on GLABRA1 . The absence of the negative regulator TRIPTYCHON leads to branching of the ectopic trichomes on cotyledons and the formation of ectopic trichomes in the leaf subepidermal cell layer. The CaMV 35S promoter-controlled expression of AtMYB23 can partially rescue the glabra1 mutant phenotype. Together, the presented data indicate that the AtMYB23 gene has partially overlapping functions with GLABRA1 in controlling the initiation of trichome development.

Journal

Developmental BiologyElsevier

Published: Jul 15, 2001

References

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