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First published online 23 February 2005
doi: 10.1242/dev.01708

Development 132, 1477-1485 (2005)
Published by The Company of Biologists 2005
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Functional diversification of MYB23 and GL1 genes in trichome morphogenesis and initiation

Victor Kirik1, Myeong Min Lee2,*, Katja Wester1, Ullrich Herrmann1, Zhengui Zheng3, David Oppenheimer3, John Schiefelbein2 and Martin Hulskamp1,{dagger}

1 Botanical Institute, University of Cologne, Gyrhofstrasse 15, 50931 Cologne, Germany
2 Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
3 Department of Botany, UF Genetics Institute, University of Florida, 220 Bartram Hall, PO Box 118526, Gainesville, FL 32611-8526, USA

{dagger} Author for correspondence (e-mail: martin.huelskamp{at}uni-koeln.de)

Accepted 19 January 2005

The functional diversification of duplicated genes is one of the driving forces in evolution. To understand the molecular mechanisms of gene diversification, we studied the functional relationship of the two Arabidopsis paralogous MYB-related genes GL1 and MYB23. We show that MYB23 controls trichome branching and trichome initiation at leaf edges. The latter is controlled redundantly together with GL1. We show that the two proteins are functionally equivalent during trichome initiation but not during trichome branching. RT-PCR and reporter construct analysis revealed spatial, temporal and genetic differences in transcriptional regulation of the GL1 and MYB23 genes. Presented data indicate that the diversification of GL1 and MYB23 gene functions occurred at the level of cis-regulatory sequences with respect to trichome initiation, and that, in parallel, the diversification with respect to regulation of trichome branching also involved changes in respective proteins.

Key words: Trichomes, Cell shape, Redundancy, GLABRA1 (GL1)


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Diversify to evolve

Development 2005 132: e701. [Full Text]  



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