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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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