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Curr Opin Plant Biol. 2006 Feb;9(1):35-40. Epub 2005 Dec 1.

Axillary bud outgrowth: sending a message.

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ARC Centre of Excellence in Integrative Legume Research, The University of Queensland, Brisbane 4072, Australia.


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.

[Indexed for MEDLINE]

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