Non-reversion of Impatiens in the absence of meristem commitment |
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Authors: | Tooke F; Pouteau S; Battey N |
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Institution: | 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 |
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Abstract: | 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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