Plant Cell Journal of Pharmacology and Experimental Therapeutics
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Plant Cell, Vol. 12, 1307-1318, August 2000, Copyright © 2000, American Society of Plant Physiologists

Molecular Analysis of the SCARECROW Gene in Maize Reveals a Common Basis for Radial Patterning in Diverse Meristems

Jun Lima, Yrjo Helariuttaa,b, Chelsea D. Spechta, Jee Junga, Lynne Simsc, Wesley B. Brucec, Scott Diehnc, and Philip N. Benfeya
a Department of Biology, New York University, New York, New York 10003
b Lewis B. and Dorothy Cullman Program for Molecular Systematic Studies, New York Botanical Garden, Bronx, New York 10458-5126
c Pioneer Hi-Bred International, Inc., Johnston, Iowa 50131

Correspondence to: Philip N. Benfey, philip.benfey{at}nyu.edu (E-mail), 212-995-4204 (fax)

Maize and Arabidopsis root apical meristems differ in several aspects of their radial organization and ontogeny. Despite the large evolutionary distance and differences in root radial patterning, analysis of the putative maize ortholog of the Arabidopsis patterning gene SCARECROW (SCR) revealed expression localized to the endodermis, which is similar to its expression in Arabidopsis. Expression in maize extends through the quiescent center, a population of mitotically inactive cells formerly thought to be undifferentiated and to lack radial pattern information. Zea mays SCARECROW (ZmSCR), the putative maize SCR ortholog, was used as a molecular marker to investigate radial patterning during regeneration of the root tip after either whole or partial excision. Analysis of the dynamic expression pattern of ZmSCR as well as other markers indicates the involvement of positional information as a primary determinant in regeneration of the root radial pattern.




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