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Originally published as Genetics Published Articles Ahead of Print on January 19, 2009.

Genetics, Vol. 181, 1693-1697, April 2009, Copyright © 2009
doi:10.1534/genetics.108.098350

The Interaction of knotted1 and thick tassel dwarf1 in Vegetative and Reproductive Meristems of Maize

Plant Gene Expression Center, University of California, Berkeley, California 94720 and United States Department of Agriculture–Agricultural Research Service, Albany, California 94710

1 Corresponding author: U.S. Department of Agriculture–ARS, 800 Buchanan St., Albany, CA 94710.
E-mail: maizesh{at}nature.berkeley.edu

In Arabidopsis, SHOOT MERISTEMLESS (STM) and CLAVATA1 (CLV1) competitively regulate meristem homeostasis. Here, we explore the interaction of their maize homologs knotted1 (kn1) and thick tassel dwarf1 (td1). kn1 mutants form fewer lateral organs and td1 inflorescences are fasciated with additional floral organs. Double mutants show kn1 epistatic to td1 in seedling and ear development but dose-sensitivity exists later to promote leaf initiation. Thus kn1 and td1 function in a pathway to maintain meristem homeostasis but their products may interact with different partners during development.