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Science 23 July 1999:
Vol. 285. no. 5427, pp. 582 - 584
DOI: 10.1126/science.285.5427.582
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Reports

Transcriptional Activation of APETALA1 by LEAFY

Doris Wagner, Robert W. M. Sablowski, * Elliot M. Meyerowitz dagger

Plants produce new appendages reiteratively from groups of stem cells called shoot apical meristems. LEAFY (LFY) and APETALA1 (AP1) are pivotal for the switch to the reproductive phase, where instead of leaves the shoot apical meristem produces flowers. Use of steroid-inducible activation of LFY demonstrated that early expression of AP1 is a result of transcriptional induction by LFY. This AP1 induction is independent of protein synthesis and occurs specifically in the tissues and at the developmental stage in which floral fate is assumed. Later expression of AP1 appears to be only indirectly affected by LFY.

California Institute of Technology, Division of Biology 156-29, Pasadena, CA 91125, USA.
*   Present address: Molecular Genetics Department, John Innes Centre, Norwich NR4 7UH, UK.

dagger    To whom correspondence should be addressed. E-mail: meyerow{at}cco.caltech.edu

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