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Journal of Experimental Botany, Vol 49, 1681-1688, Copyright © 1998 by Oxford University Press

ARTICLES

Non-reversion of Impatiens in the absence of meristem commitment

F Tooke, S Pouteau and N Battey
Department of Horticulture, Plant Science Laboratories, The University of Reading, Whiteknights, Reading RG6 6AS, UK; Laboratoire de Biologie Cellulaire, INRA, Route de St Cyr, F78026 Versailles cedex, France; Corresponding author

Purple-flowered plants of Impatiens balsamina maintained floral development on transfer from inductive short days (SD) to long days (LD), a treatment in which red-flowered plants of Impatiens are known to revert to leaf production. An investigation into the non-reverting nature of purple-flowered plants was carried out to establish whether these plants achieved meristem commitment or whether their non-reverting state was controlled by the leaves. When the leaves that had unfolded during the inductive SD treatment were removed at the time of transfer to LD, the purple-flowered plant did revert. This result suggests that, as in red-flowered Impatiens, meristem commitment is absent, but that purple-flowered plants maintain flowering in LD conditions because of a more permanent supply of signal from their leaves than occurs in red-flowered plants. A working hypothesis is proposed to explain how a signal from the leaves can retain a controlling role during flower development.Key words: Floral commitment, Impatiens, floral reversion, floricaula.
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