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A Common Position-Dependent Mechanism Controls Cell-Type Patterning and GLABRA2 Regulation in the Root and Hypocotyl Epidermis of Arabidopsis1

Chen-Yi Hung, Yan Lin, Meng Zhang, Susan Pollock, M. David Marks, and John Schiefelbein*

Department of Biology, University of Michigan, Ann Arbor, Michigan 48109-1048 (C.-Y.H., Y.L., M.Z., J.S.); and Department of Genetics and Cell Biology, University of Minnesota, St. Paul, Minnesota 55108-1095 (S.P., M.D.M.)

A position-dependent pattern of epidermal cell types is produced during root development in Arabidopsis thaliana. This pattern is reflected in the expression pattern of GLABRA2 (GL2), a homeobox gene that regulates cell differentiation in the root epidermis. GL2 promoter::GUS fusions were used to show that the TTG gene, a regulator of root epidermis development, is necessary for maximal GL2 activity but is not required for the pattern of GL2 expression. Furthermore, GL2-promoter activity is influenced by expression of the myc-like maize R gene (35S::R) in Arabidopsis but is not affected by gl2 mutations. A position-dependent pattern of cell differentiation and GL2-promoter activity was also discovered in the hypocotyl epidermis that was analogous to the pattern in the root. Non-GL2-expressing cell files in the hypocotyl epidermis located outside anticlinal cortical cell walls exhibit reduced cell length and form stomata. Like the root, the hypocotyl GL2 activity was shown to be influenced by ttg and 35S::R but not by gl2. The parallel pattern of cell differentiation in the root and hypocotyl indicates that TTG and GL2 participate in a common position-dependent mechanism to control cell-type patterning throughout the apical-basal axis of the Arabidopsis seedling.

1   This research was supported by a National Science Foundation grant to J.S. (no. IBN-9724149) and a U.S. Department of Agriculture grant to M.D.M. (no. 95-37304-2219). C.-Y.H. and M.Z. were partially supported by funds from the University of Michigan Rackham Graduate School (Ann Arbor).
*   Corresponding author; e-mail schiefel{at}umich.edu; fax 1-734-647-0884.

Plant Physiol. (1998) 117: 73-84
Copyright Clearance Center:   0032-0889/98/117/0073/12
© 1998 American Society of Plant Physiologists




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