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Plant Physiol, July 2001, Vol. 126, pp. 1205-1213
Mutational Analysis of Branching in Pea. Evidence That
Rms1 and Rms5 Regulate the Same Novel
Signal1
Suzanne E.
Morris,
Colin G.N.
Turnbull,2
Ian C.
Murfet, and
Christine A.
Beveridge*
Department of Botany, The University of Queensland, Brisbane,
Queensland 4072, Australia (S.E.M., C.G.N.T., C.A.B.); and School of
Plant Science, The University of Tasmania, G.P.O. Box 252-55, Hobart,
Tasmania 7001, Australia (I.C.M.)
The fifth increased branching ramosus
(rms) mutant, rms5, from pea
(Pisum sativum), is described here for phenotype and
grafting responses with four other rms mutants. Xylem
sap zeatin riboside concentration and shoot auxin levels in
rms5 plants have also been compared with
rms1 and wild type (WT). Rms1 and
Rms5 appear to act closely at the biochemical or
cellular level to control branching, because branching was inhibited in
reciprocal epicotyl grafts between rms5 or
rms1 and WT plants, but not inhibited in reciprocal
grafts between rms5 and rms1 seedlings.
The weakly transgressive or slightly additive phenotype of the
rms1 rms5 double mutant provides further evidence for
this interaction. Like rms1, rms5
rootstocks have reduced xylem sap cytokinin concentrations, and
rms5 shoots do not appear deficient in indole-3-acetic
acid or 4-chloroindole-3-acetic acid. Rms1 and
Rms5 are similar in their interaction with other
Rms genes. Reciprocal grafting studies with
rms1, rms2, and rms5,
together with the fact that root xylem sap cytokinin concentrations are
reduced in rms1 and rms5 and elevated in
rms2 plants, indicates that Rms1 and
Rms5 may control a different pathway than that
controlled by Rms2. Our studies indicate that
Rms1 and Rms5 may regulate a novel
graft-transmissible signal involved in the control of branching.
1
This work was funded by an Australian Research
Council Large Grant, by an Australian Postgraduate Award (to S.E.M.),
and by an Australian Research Council Fellowship (to C.A.B.).
2
Present address: T.H. Huxley School, Imperial College at
Wye, University of London, Wye, Ashford, Kent TN25 5AH, UK.
*
Corresponding author; e-mail c.beveridge{at}botany.uq.edu.au; fax
61-7-3365-1699.
© 2001 American Society of Plant Physiologists
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