Vegetative phase change is mediated by a leaf-derived signal that represses the transcription of miR156.

ABSTRACT: Vegetative phase change in Arabidopsis is regulated by miR156, a microRNA that promotes the expression of the juvenile phase and represses the expression of the adult phase. miR156 is expressed at a very high level early in shoot development and then decreases, leading to the onset of the adult phase. To determine the source of the factors that regulate vegetative phase change, we examined the effect of root and leaf ablation on the timing of this transition. Ablation of the root system or cotyledons had no effect on the timing of vegetative phase change, but ablation of leaf primordia delayed this transition in a miR156-dependent fashion. This treatment produced an increase in the overall abundance of miR156, which was attributable to an increase in the transcription of some, but not all,

SUBMITTER: Yang L 

PROVIDER: S-EPMC3005601 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature