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THE PLANT CELL, Vol 7, Issue 6 735-745, Copyright © 1995 by American Society of Plant Biologists
LRP1, a Gene Expressed in Lateral and Adventitious Root Primordia of Arabidopsis
D. L. Smith and N. V. Fedoroff
Department of Embryology, Carnegie Institution of Washington, 115 West University Parkway, Baltimore, Maryland 21210
We describe a gene that is expressed in lateral and adventitious root
primordia of Arabidopsis. The gene was identified by expression of a
transposon-borne promoterless [beta]-glucuronidase gene in lateral root
primordia. The gene, designated LRP1 for lateral root primordium 1, and its
corresponding cDNA were cloned and sequenced. The expression pattern of the
gene in lateral root primordia was confirmed by in situ hybridization with
LRP1 cDNA probes. The LRP1 gene encodes a novel protein. LRP1 expression is
activated during the early stages of root primordium development and is
turned off prior to the emergence of lateral roots from the parent root.
Insertion of the transposon in the LRP1 gene disrupted its expression. To
evaluate the homozygous insertion line for a mutant phenotype, several
aspects of wild-type lateral root development were analyzed. A mutant
phenotype has not yet been identified in the insertion line; however, there
is evidence that the gene belongs to a small gene family. LRP1 provides a
molecular marker to study the early stages of lateral and adventitious root
primordium development.
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