Reduction of cytokinin signalling substantially delayed the transition to the adult stage. Here we show that the phytohormone cytokinin promotes the juvenile-to-adult phase transition through regulating components of the age pathway. This vegetative phase change is primarily regulated by the opposite actions of two microRNAs, the inhibitory miR156 and the promoting miR172 as well as their respective target genes, constituting the age pathway. During vegetative growth plants pass from a juvenile to an adult phase causing changes in shoot morphology.
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