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First published online October 10, 2003; 10.1105/tpc.015214

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The Plant Cell, Vol. 15, 2592-2602, November 2003, www.plantcell.org ©2003, American Society of Plant Biologists

Two Discrete cis Elements Control the Abaxial Side–Specific Expression of the FILAMENTOUS FLOWER Gene in Arabidopsis

Keiro Watanabea and Kiyotaka Okada1,a,b

a Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
b CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 322-0012, Japan

1 To whom correspondence should be addressed. E-mail kiyo{at}ok-lab.bot.kyoto-u.ac.jp; fax 81-75-753-4257

Our previous studies showed that a member of the YABBY gene family, FILAMENTOUS FLOWER (FIL), plays a role in specifying the abaxial side tissues in the development of lateral organs such as cotyledons, leaves, young flower buds, and flower organs. We examined the expression pattern of FIL and found a temporal change of expression domains in the developmental process of the floral meristem. We also examined the cis control regions by constructing a series of transgenic plants that carry green fluorescent protein under the control of the FIL promoter with several types of deletions, base changes, and tandem repeats and showed that the unique expression pattern is dependent on at least two cis-acting elements in the 5' regulatory region. One element proximal to the FIL gene would be responsible for the expression of both the abaxial and adaxial sides, and the other element of the 12-bp sequence would work to repress expression on the adaxial side.




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