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PLANT PHYSIOLOGY , Vol 110, Issue 3 859-865, Copyright © 1996 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Branching in Pea (Action of Genes Rms3 and Rms4)
C. A. Beveridge, J. J. Ross and I. C. Murfet
Department of Plant Science, University of Tasmania, G.P.O. Box 252C, Hobart, Tasmania, 7001, Australia
The nonallelic ramosus mutations rms3-2 and rms4 of pea (Pisum sativum L.)
cause extensive release of vegetative axillary buds and lateral growth in
comparison with wild-type (cv Torsdag) plants, in which axillary buds are
not normally released under the conditions utilized. Grafting studies
showed that the expression of the rms4 mutation in the shoot is independent
of the genotype of the root-stock. In contrast, the length of the branches
at certain nodes of rms3-2 plants was reduced by grafting to wild-type
stocks, indicating that the wild-type Rms3 gene may control the level of a
mobile substance produced in the root. This substance also appears to be
produced in the shoot because Rms3 shoots did not branch when grafted to
mutant rms3-2 rootstocks. However, the end product of the Rms3 gene appears
to differ from that of the Rms2 gene (C.A. Beveridge, J.J. Ross, and I.C.
Murfet [1994] Plant Physiol 104: 953-959) because reciprocal grafts between
rms3-2 and rms2 seedlings produced mature shoots with apical dominance
similar to that of rms3-2 and rms2 shoots grafted to wild-type stocks.
Indole-3-acetic acid levels were not reduced in apical or nodal portions of
rms4 plants and were actually elevated (up to 2-fold) in rms3-2 plants. It
is suggested that further studies with these branching mutants may enable
significant progress in understanding the normal control of apical
dominance and the related communication between the root and shoot.
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