Journal
CURRENT OPINION IN PLANT BIOLOGY
Volume 9, Issue 1, Pages 35-40Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.pbi.2005.11.006
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Mutants that branch profusely in the presence of a growing shoot tip have highlighted the role of graft-transmissible signals that are produced in roots and stem. Orthologous genes in Arabidopsis, pea and petunia are involved in the transmission of a novel long-distance message. These genes show varying degrees of regulation by auxin and an auxin-independent feedback system, and encode enzymes that might act on carotenoid-like substrates. Axillary bud outgrowth is under homeostatic control, involving developmental stages or checkpoints. Perturbation of the long-range messaging and auxin depletion does not guarantee that bud outgrowth will ensue at a particular node.
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