Axillary bud outgrowth: sending a message.
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.
Beveridge
Christine A
CA
ARC Centre of Excellence in Integrative Legume Research, The University of Queensland, Brisbane 4072, Australia. c.beveridge@uq.edu.au
D063245:Plant Development; D010937:Plant Growth Regulators / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D010944:Plants / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction
D010937:Plant Growth Regulators; D010940:Plant Proteins