Plants undergo distinct phase transitions during their post-embryonic development and progresses from the juvenile to the adult and reproductive phases. These transitions are characterized by morphological and molecular changes and are differently influenced by gibberellins (GAs) and cytokinins (CKs). GAs are notably known to either induce or repress phase transition and flowering in diverse plant species. This GA-mediated modulation is ultimately related to the behavior of the DELLA transcriptional regulators. CKs influence phase transitions by promoting meristem cell divisions and flowering stimulation. Moreover, CKs and GAs can mutually repress each other or have complementary functions in processes such as branching and flowering. Therefore, the effects observed such as flower formation and vegetative growth is modulated by the co-regulation exerted by the cross-talk of both GA and CK pathways. We review the roles of GA and CK in phase transitions at the molecular level in model species such as Arabidopsis and the genes that are modulated by both GA and CK pathways. Additionally we point out perspectives of the conservation of these molecular pathways in tropical plants.

植物在其胚后发育期间经历不同的相变，并且从幼年期到成年期和生殖期发展。这些转变的特征是形态和分子变化，并且受赤霉素（GAs）和细胞分裂素（CKs）的影响不同。众所周知，GA可以诱导或抑制多种植物物种的相变和开花。这种由GA介导的调节作用最终与DELLA转录调节因子的行为有关。CK通过促进分生组织细胞分裂和开花刺激来影响相变。而且，CK和GA可以相互抑制或在分支和开花等过程中具有互补功能。因此，GA和CK通路的串扰共同调控了观察到的诸如花形成和营养生长等效应。我们回顾了GA和CK在模型物种如分子水平上的相变中的作用。拟南芥以及受GA和CK途径调节的基因。此外，我们指出了在热带植物中这些分子途径的保守性观点。