The Sequential Action of miR156 and miR172 Regulates Developmental Timing in Arabidopsis

Gang Wu, Mee Yeon Park, Susan R. Conway, Jia Wei Wang, Detlef Weigel, R. Scott Poethig

Research output: Contribution to journalArticlepeer-review

1264 Scopus citations


The transition from the juvenile to the adult phase of shoot development in plants is accompanied by changes in vegetative morphology and an increase in reproductive potential. Here, we describe the regulatory mechanism of this transition. We show that miR156 is necessary and sufficient for the expression of the juvenile phase, and regulates the timing of the juvenile-to-adult transition by coordinating the expression of several pathways that control different aspects of this process. miR156 acts by repressing the expression of functionally distinct SPL transcription factors. miR172 acts downstream of miR156 to promote adult epidermal identity. miR156 regulates the expression of miR172 via SPL9 which, redundantly with SPL10, directly promotes the transcription of miR172b. Thus, like the larval-to-adult transition in Caenorhabditis elegans, the juvenile-to-adult transition in Arabidopsis is mediated by sequentially operating miRNAs. miR156 and miR172 are positively regulated by the transcription factors they target, suggesting that negative feedback loops contribute to the stability of the juvenile and adult phases.

Original languageEnglish (US)
Pages (from-to)750-759
Number of pages10
Issue number4
StatePublished - Aug 21 2009

Bibliographical note

Funding Information:
We are grateful to members of the Poethig laboratory for comments on this manuscript and helpful discussions throughout the course of these experiments. We are also grateful to Milo Aukerman for supplying seeds of toe1 toe2 . This research was supported by a grant from NIH ( R01 GM051893 ).


  • RNA


Dive into the research topics of 'The Sequential Action of miR156 and miR172 Regulates Developmental Timing in Arabidopsis'. Together they form a unique fingerprint.

Cite this