Benková Eva, Ivanchenko Maria G, Friml Jirí, Shishkova Svetlana, Dubrovsky Joseph G
Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, Gent University, Technologiepark 927, 9052 Gent, Belgium.
Trends Plant Sci. 2009 Apr;14(4):189-93. doi: 10.1016/j.tplants.2009.01.006. Epub 2009 Mar 13.
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.
形态发生素参与建立对于模式形成至关重要的位置信息。在植物中，植物激素生长素表现出一些形态发生素的特征。胚胎和根尖内的组织模式形成需要生长素分布梯度。在其他一些情况下，例如从头器官发生，生长素的作用可以更好地用形态发生触发因子来描述，形态发生触发因子被定义为通过局部浓度增加诱导原本与其相邻细胞相似的植物细胞获得新的发育命运的因子。形态发生触发因子确定新器官将形成的部位。在植物中，重复和模块化结构的形成可能需要形态发生触发因子和形态发生素的共同作用。
