Schmid, Markus
- Max Planck Institute for Developmental Biology
Abstract
Gibberellin (GA), a diterpene hormone, plays diverse roles in plant growth and development, including seed germination, stem elongation, and flowering time. Although it is known that GA accelerates flowering through degradation of transcription repressors, DELLAs, the underlying mechanism is poorly understood. We show here that DELLA directly binds to microRNA156 (miR156)-targeted SQUAMOSA PROMOTER BINDING-LIKE (SPL) transcription factors, which promote flowering by activating miR172 and MADS box genes. The interaction between DELLA and SPL interferes with SPL transcriptional activity and consequently delays floral transition through inactivating miR172 in leaves and MADS box genes at shoot apex under long-day conditions or through repressing MADS box genes at the shoot apex under short-day conditions. Our results elucidate the molecular mechanism by which GA controls flowering and provide the missing link between DELLA and MADS box genes.
Published in
Plant Cell
2012, volume: 24, number: 8, pages: 3320-3332
Publisher: AMER SOC PLANT BIOLOGISTS
SLU Authors
UKÄ Subject classification
Genetics and Genomics
Publication identifier
- DOI: https://doi.org/10.1105/tpc.112.101014
Permanent link to this page (URI)
https://res.slu.se/id/publ/127176