Divergence of the floral a-function between an asterid and a rosid species - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles The Plant cell Year : 2017

Divergence of the floral a-function between an asterid and a rosid species

Abstract

The ABC model is widely used as a genetic framework for understanding floral development and evolution. In this model, the A-function is required for the development of sepals and petals and to antagonize the C-function in the outer floral whorls. In the rosid species Arabidopsis thaliana, the AP2-type AP2 transcription factor represents a major A-function protein, but how the A-function is encoded in other species is not well understood. Here, we show that in the asterid species petunia (Petunia hybrida), AP2B/BLIND ENHANCER (BEN) confines the C-function to the inner petunia floral whorls, in parallel with the microRNA BLIND. BEN belongs to the TOE-type AP2 gene family, members of which control flowering time in Arabidopsis. In turn, we demonstrate that the petunia AP2-type REPRESSOR OF B-FUNCTION (ROB) genes repress the B-function (but not the C-function) in the first floral whorl, together with BEN. We propose a combinatorial model for patterning the B-and C-functions, leading to the homeotic conversion of sepals into petals, carpels, or stamens, depending on the genetic context. Combined with earlier results, our findings suggest that the molecular mechanisms controlling the spatial restriction of the floral organ identity genes are more diverse than the well-conserved B and C floral organ identity functions.
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Dates and versions

hal-01608198 , version 1 (09-07-2024)

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Patrice Morel, Klaas Heijmans, Frédérique Rozier, Jan Zethof, Sophy Chamot, et al.. Divergence of the floral a-function between an asterid and a rosid species. The Plant cell, 2017, 29 (7), pp.1605-1621. ⟨10.1105/tpc.17.00098⟩. ⟨hal-01608198⟩
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