Transcriptional Activation of APETALA1 by LEAFY

Science  23 Jul 1999:
Vol. 285, Issue 5427, pp. 582-584
DOI: 10.1126/science.285.5427.582

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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.

  • * Present address: Molecular Genetics Department, John Innes Centre, Norwich NR4 7UH, UK.

  • To whom correspondence should be addressed. E-mail: meyerow{at}

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