Moubayidin Laila, Di Mambro Riccardo, Sabatini Sabrina
Dipartimento di Genetica e Biologia Molecolare, Laboratory of Functional Genomics and Proteomics of Model Systems, Università La Sapienza, 00185 Rome, Italy.
Trends Plant Sci. 2009 Oct;14(10):557-62. doi: 10.1016/j.tplants.2009.06.010. Epub 2009 Sep 4.
Post-embryonic plant growth and development are sustained by meristems, a source of undifferentiated cells that give rise to the adult plant structures. Two hormones, cytokinin and auxin, are known to act antagonistically in controlling meristem activities. Here, we review recent significant progress in elucidating the molecular mechanisms through which these hormones interact to control specific aspects of plant development. For example, in the root meristem of Arabidopsis thaliana, cytokinin promotes cell differentiation by repressing both auxin signalling and transport, whereas auxin sustains root meristem activity by promoting cell division. The coordinated action of these two hormones is essential for maintaining root meristem size and for ensuring root growth.
胚后植物的生长和发育由分生组织维持，分生组织是未分化细胞的来源，可形成成年植物的结构。已知细胞分裂素和生长素这两种激素在控制分生组织活动中起拮抗作用。在这里，我们综述了在阐明这些激素相互作用以控制植物发育特定方面的分子机制方面的最新重大进展。例如，在拟南芥的根分生组织中，细胞分裂素通过抑制生长素信号传导和运输来促进细胞分化，而生长素则通过促进细胞分裂来维持根分生组织的活性。这两种激素的协同作用对于维持根分生组织的大小和确保根的生长至关重要。
