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Science 8 November 2002:
Vol. 298. no. 5596, pp. 1238 - 1241
DOI: 10.1126/science.1076920
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Reports

The Control of Spikelet Meristem Identity by the branched silkless1 Gene in Maize

George Chuck,14* Michael Muszynski,2 Elizabeth Kellogg,3 Sarah Hake,1 Robert J. Schmidt4

Most of the world's food supply is derived from cereal grains that are borne in a unique structure called the spikelet, the fundamental unit of inflorescence architecture in all grasses. branched silkless1 (bd1) is a maize mutation that alters the identity of the spikelet meristem, causing indeterminate branches to form in place of spikelets. We show that bd1 encodes a putative ERF transcription factor that is conserved in different grasses and is expressed in a distinct domain of the spikelet meristem. Its expression pattern suggests that signaling pathways regulate meristem identity from lateral domains of the spikelet meristem.

1 Plant Gene Expression Center, U.S. Department of Agriculture-Agricultural Research Service, 800 Buchanan Street, Albany, CA 94710, USA.
2 Pioneer Hi-Bred International, Johnston, IA, 50131, USA.
3 University of Missouri-St. Louis, 8001 Natural Bridge Road, St. Louis, MO 63121, USA.
4 Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093-0116, USA.
*   To whom correspondence should be addressed. E-mail: gchuck{at}nature.berkeley.edu

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