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Plant Physiol, June 2000, Vol. 123, pp. 689-698
Auxin Inhibition of Decapitation-Induced Branching Is Dependent
on Graft-Transmissible Signals Regulated by Genes Rms1 and
Rms21
Christine A.
Beveridge,*
Gregory M.
Symons, and
Colin G.N.
Turnbull
Department of Botany, The University of Queensland,
Brisbane, Queensland 4072, Australia (C.A.B., C.G.N.T.); and School of
Plant Science, University of Tasmania, G.P.O. Box 252-55, Hobart,
Tasmania 7001, Australia (G.M.S.)
Decapitation-induced axillary bud outgrowth is a vital
mechanism whereby shoots are able to continue normal growth and
development. In many plants, including wild-type garden pea
(Pisum sativum L.), this process can be inhibited by
exogenous auxin. Using the ramosus (rms) increased
branching mutants of pea, we present evidence that this response to
auxin is dependent on graft-transmissible substance(s) regulated by the
genes Rms1 and Rms2. The response to
exogenous auxin is massively diminished in decapitated
rms1 and rms2 mutant plants. However,
basipetal auxin transport is not reduced in intact or decapitated
mutants. Grafting rms1 or rms2 shoots
onto wild-type rootstocks restored the auxin response, indicating that
Rms1 and Rms2 gene action in the
rootstock is sufficient to enable an auxin response in mutant shoots.
We conclude that Rms1 and Rms2 act in the
rootstock and shoot to control levels of mobile substance(s) that
interact with exogenous auxin in the inhibition of bud outgrowth after
decapitation. At least for rms1, the reduced auxin
response is unlikely to be due to an inability of auxin to decrease
xylem sap cytokinin content, as this is already low in intact
rms1 plants. Consequently, we have genetic evidence that
auxin action in decapitated plants depends on at least one novel
long-distance signal.
1
This work was supported by grants from the
Australian Research Council and by a University of Queensland Enabling
Grant. G.M.S. was supported by an Australian Postgraduate Award.
*
Corresponding author; e-mail c.beveridge{at}botany.uq.edu.au; fax
61-7-3365-1699.
© 2000 American Society of Plant Physiologists
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