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Quantitative Control of Inflorescence Formation in
Impatiens balsamina1
Sylvie Pouteau2, *,
Fiona Tooke, and
Nicholas Battey
Department of Horticulture, Plant Science Laboratories, University
of Reading, Whiteknights, Reading, RG6 6AS, United Kingdom
We
analyzed the process of inflorescence formation in Impatiens
balsamina by studying the architecture of the plant under different photoperiod treatments. Floral reversion under noninductive conditions in this species is caused by the lack of persistence of the
induced state in the leaf. This can be used to control the amount of
inductive signal and to examine its quantitative influence on
morphological changes in the plant. The floral transition was
characterized by a continuum of variation at the level of meristem
identity, primordium initiation, and floral organ identity. This
continuum was enhanced during reversion, suggesting that the
establishment of a continuum partly reflects limiting amounts of
inductive signal exported from the leaf to the meristem. The transcription patterns of two homologs of genes involved in the control
of floral meristem identity, Imp-FLO and
Imp-FIM, were similar in terminal and axillary flowers
and may be associated with the continuum exhibited by I. balsamina. By analyzing the fate of axillary meristem primordia
initiated before and after the beginning of the inductive period, we
showed that de novo initiation of axillary meristem primordia by the
evoked meristem is not required and that primordia initiated before
evocation can adopt different fates, depending on the amount of
inductive signal. The influence of age and/or position on primordium
responsiveness to the inductive signal is discussed.
1
This work was funded by the Biotechnology and
Biological Science Research Council Cell Molecular Biology Initiative
(grant no. AT45/559 to F.T.). S.P. was supported by the Institut
National de la Recherche Agronomique, Versailles, France.
2
Present address: Laboratoire de Biologie
Cellulaire, Institut National de la Recherche Agronomique, Route de
Saint-Cyr, F78026 Versailles cedex, France.
*
Corresponding author; e-mail pouteau{at}versailles.inra.fr; fax
33-1-30-83-30-99.
Plant Physiol. (1998) 118: 1191-1201
Copyright Clearance Center: 0032-0889/98/118//11
© 1998 American Society of Plant Physiologists
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