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THE PLANT CELL, Vol 7, Issue 2 225-234, Copyright © 1995 by American Society of Plant Biologists
NFL, the Tobacco Homolog of FLORICAULA and LEAFY, Is Transcriptionally Expressed in Both Vegetative and Floral Meristems
A. J. Kelly, M. B. Bonnlander and D. R. Meeks-Wagner
Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403
The homologous genes FLORICAULA (FLO) of Antirrhinum and LEAFY (LFY) of
Arabidopsis regulate the formation of determinate floral meristems.
Transcripts of these single-copy genes are confined to floral meristems and
some floral organs as well as to the leaflike bracts that subtend
Antirrhinum flowers. Based on these observations, we hypothesized that the
transcription of genes homologous to FLO and LFY in tobacco, a determinate
plant in which the primary shoot apex is consumed in the production of a
terminal flower, would serve as a molecular marker for floral commitment.
Surprisingly, transcripts of the tobacco homologs NFL1 and NFL2 (Nicotiana
FLO/LFY) were found not only in floral meristems, but also in indeterminate
vegetative meristems. This implies that the transcriptional expression of
the FLO/LFY homologous genes in the apical meristem is not sufficient for
the initiation of floral meristem development. In addition, the transcript
patterns of the NFL genes identified a previously undescribed subset of
cells within the shoot apical meristem that may indicate unique functional
compartmentalization. This suggests that, unlike FLO and LFY, which specify
determinacy only during floral development, the NFL genes act to specify
determinacy in the progenitor cells for both flowers and leaves.
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