microRNA172 down-regulates glossy15 to promote vegetative phase change in maize

Nick Lauter, Archana Kampani, Shawn Carlson, Mark Goebel, Stephen P. Moose

Research output: Contribution to journalArticlepeer-review

Abstract

Shoot development in many higher plant species is characterized by phase change, where meristems and organs transition from one set of identities to another. The transition from a juvenile to adult leaf identity in maize is regulated by the APETALA2-like gene glossy15 (gl15). We demonstrate here that increasing gl15 activity in transgenic maize not only increases the number of leaves expressing juvenile traits, but also delays the onset of reproductive development, indicating that gl15 plays a primary role in the maintenance of the juvenile phase. We also show that the accumulation of a maize microRNA homologous to mR172 increases during shoot development and mediates gl15 mRNA degradation. These data indicate that vegetative phase change in maize is regulated by the opposing actions of gl15 and miR172, with gl15 maintaining the juvenile phase and miR172 promoting the transition to the adult phase by down-regulation of gl15. Our results also suggest that the balance of activities between APETALA2-like genes and miR172 may be a general mechanism for regulating vegetative phase change in higher plants.

Original languageEnglish (US)
Pages (from-to)9412-9417
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number26
DOIs
StatePublished - Jun 28 2005

Keywords

  • Flowering time
  • Juvenile-to-adult transition

ASJC Scopus subject areas

  • General

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