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Plant and Cell Physiology 2004 45(7):945-950; doi:10.1093/pcp/pch100
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© 2004 Oxford University Press

Short Communication

GMPOZ, a BTB/POZ Domain Nuclear Protein, is a Regulator of Hormone Responsive Gene Expression in Barley Aleurone

Fiona J. Woodger1,2, John V. Jacobsen and Frank Gubler

CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia

Abstract

GAMYB is a GA-responsive activator of hydrolase gene expression in the aleurone layer of germinated cereal grains. We have isolated a putative GAMYB-binding protein, GMPOZ, which contains a BTB/POZ domain found in certain animal transcriptional regulators. Although BTB/POZ domain proteins are numerous in plants, very few are yet characterized. We found that GMPOZ is nuclear localized and that GMPOZ mRNA is expressed highly in anthers as well as aleurone. Transient silencing of the GMPOZ gene suggests that GMPOZ is involved in hormone responsive gene expression in aleurone.

Footnotes

1 Present address: Research School of Biological Sciences, Australian National University, ACT, 0200, Australia.

2 Corresponding author: E-mail, woodger{at}rsbs.anu.edu.au; Fax, +61-2-61255075.


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