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Plant Physiol, May 2001, Vol. 126, pp. 203-209
Long-Distance Signaling and the Control of Branching in the
rms1 Mutant of Pea1
Eloise
Foo,
Colin G.N.
Turnbull,2 and
Christine
A.
Beveridge*
Department of Botany, The University of Queensland, Brisbane,
Queensland 4072, Australia
The ramosus (rms)
mutation (rms1) of pea (Pisum sativum) causes
increased branching through modification of graft-transmissible signal(s) produced in rootstock and shoot. Additional grafting techniques have led us to propose that the novel signal regulated by
Rms1 moves acropetally in shoots and acts as a branching
inhibitor. Epicotyl interstock grafts showed that wild-type (WT)
epicotyls grafted between rms1 scions and rootstocks can
revert mutant scions to a WT non-branching phenotype. Mutant scions
grafted together with mutant and WT rootstocks did not branch despite a
contiguous mutant root-shoot system. The primary action of
Rms1 is, therefore, unlikely to be to block transport of
a branching stimulus from root to shoot. Rather, Rms1
may influence a long-distance signal that functions, directly or
indirectly, as a branching inhibitor. It can be deduced that this
signal moves acropetally in shoots because WT rootstocks inhibit
branching in rms1 shoots, and although WT scions do not
branch when grafted to mutant rootstocks, they do not inhibit branching
in rms1 cotyledonary shoots growing from the same
rootstocks. The acropetal direction of transport of the Rms1 signal supports previous evidence that the
rms1 lesion is not in an auxin biosynthesis or transport
pathway. The different branching phenotypes of WT and
rms1 shoots growing from the same rms1
rootstock provides further evidence that the shoot has a major role in
the regulation of branching and, moreover, that root-exported cytokinin
is not the only graft-transmissible signal regulating branching in
intact pea plants.
1
This work was supported by the Australian
Research Council.
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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