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THE PLANT CELL, Vol 5, Issue 12 1739-1748, Copyright © 1993 by American Society of Plant Biologists
Arabidopsis GLABROUS1 Gene Requires Downstream Sequences for Function
J. C. Larkin, D. G. Oppenheimer, S. Pollock and M. D. Marks
School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0118
The Arabidopsis GLABROUS1 (GL1) gene is a myb gene homolog required for the
initiation of trichome development. In situ hybridization revealed that the
highest levels of GL1 transcripts were present in developing trichomes. In
contrast, previous work had shown that putative promoter sequences from the
5[prime] noncoding region of the GL1 gene directed the expression of a
[beta]-glucuronidase (GUS) reporter gene only in stipules. Deletion
analysis of the 3[prime] noncoding region of GL1 has identified an enhancer
that is essential for GL1 function. Sequences from the region containing
the enhancer, in conjunction with GL1 upstream sequences, direct the
expression of a GUS reporter gene in leaf primordia and developing
trichomes in addition to stipules, indicating that the downstream enhancer
is required for the normal expression pattern of GL1.
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