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Floral homeotic proteins modulate the genetic program for leaf development to suppress trichome formation in flowers.

Authors
  • Ó'Maoiléidigh, Diarmuid S1, 2
  • Stewart, Darragh1
  • Zheng, Beibei3
  • Coupland, George2
  • Wellmer, Frank3
  • 1 Smurfit Institute of Genetics, Trinity College Dublin, Ireland [email protected] , (Ireland)
  • 2 Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, D-50829 Cologne, Germany. , (Germany)
  • 3 Smurfit Institute of Genetics, Trinity College Dublin, Ireland. , (Ireland)
Type
Published Article
Journal
Development
Publisher
The Company of Biologists
Publication Date
Feb 13, 2018
Volume
145
Issue
3
Identifiers
DOI: 10.1242/dev.157784
PMID: 29361563
Source
Medline
Keywords
License
Unknown

Abstract

As originally proposed by Goethe in 1790, floral organs are derived from leaf-like structures. The conversion of leaves into different types of floral organ is mediated by floral homeotic proteins, which, as described by the ABCE model of flower development, act in a combinatorial manner. However, how these transcription factors bring about this transformation process is not well understood. We have previously shown that floral homeotic proteins are involved in suppressing the formation of branched trichomes, a hallmark of leaf development, on reproductive floral organs of Arabidopsis Here, we present evidence that the activities of the C function gene AGAMOUS (AG) and the related SHATTERPROOF1/2 genes are superimposed onto the regulatory network that controls the distribution of trichome formation in an age-dependent manner. We show that AG regulates cytokinin responses and genetically interacts with the organ polarity gene KANADI1 to suppress trichome initiation on gynoecia. Thus, our results show that parts of the genetic program for leaf development remain active during flower formation but have been partially rewired through the activities of the floral homeotic proteins.

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