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



Ó'Maoiléidigh, Diarmuid S, Stewart, Darragh, Zheng, Beibei, Coupland, George and Wellmer, Frank
(2018) Floral homeotic proteins modulate the genetic program for leaf development to suppress trichome formation in flowers. Development (Cambridge, England), 145 (3).

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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.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 28 Feb 2019 09:53
Last Modified: 26 Jan 2021 12:05
DOI: 10.1242/dev.157784
Open Access URL: http://dev.biologists.org/content/develop/145/3/de...
URI: https://livrepository.liverpool.ac.uk/id/eprint/3033532