A morphogenetic trigger: is there an emerging concept in plant developmental biology?
Morphogens are involved in the establishment of positional information that is essential for pattern formation. In plants, the phytohormone auxin displays some characteristics of a morphogen. Gradients of auxin distribution are required for tissue patterning within the embryo and the root apex. In some other instances, such as de novo organogenesis, auxin action can be better described in terms of a morphogenetic trigger, which is defined as a factor that induces, through local increase of its concentration, acquisition of a new developmental fate in plant cells that were originally similar to their neighbours. A morphogenetic trigger specifies the site where a new organ will be formed. In plants, formation of reiterative and modular structures might need the action of both morphogenetic triggers and morphogens.
Benková
Eva
E
Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, Gent University, Technologiepark 927, 9052 Gent, Belgium.
Ivanchenko
Maria G
MG
Friml
Jirí
J
Shishkova
Svetlana
S
Dubrovsky
Joseph G
JG
D002454:Cell Differentiation; D048430:Cell Shape; D007210:Indoleacetic Acids / Q000378:metabolism; D008954:Models, Biological; D009024:Morphogenesis; D059828:Plant Cells; D063245:Plant Development; D010937:Plant Growth Regulators / Q000378:metabolism*; D010944:Plants / Q000378:metabolism
D007210:Indoleacetic Acids; D010937:Plant Growth Regulators