Journalartikel

Jahr der Veröffentlichung: 2016

Seiten: 845-858

Zeitschrift: Annals of Botany

Bandnummer: 117

Heftnummer: 5

ISSN: 0305-7364

eISSN: 1095-8290

Open Access Status: Green

DOI Link: https://doi.org/10.1093/aob/mcw037

Verlag: Oxford University Press

Abstract: 

Background The flowers of
core eudicots and monocots are generally determined by the number of
floral organs they produce, and their developmental set-up tolerates
little change from the bauplan once the floral primordium is initiated.
Many species outside the core eudicots and monocots are more plastic in
the number of floral organs they produce. For example, the Nymphaeales
(water lilies), within the basal angiosperms, arrange their floral
organs spirally and show smooth transitions between floral organs, and
many Ranunculales (buttercups) produce variable numbers of stamens by
adjusting the number of stamen whorls generated from a specialized ring
meristem. However, the interactions of regulatory genes governing those
processes are unknown.

Scope and Conclusions This
review provides an overview of the functional analyses of floral
homeotic genes carried out in Ranunculales, summarizing knockdown and
mutant phenotypes, and protein interactions to identify similarities and
differences within the Ranunculales and in comparison with core
eudicots. Floral gene regulatory networks in Ranunculales are identified
showing intensive re-wiring amongst the floral homeotic genes to allow
some degree of plasticity. The ‘fading-border’ model of floral organ
identity evolution is extended by a hypothesis on how developmental
plasticity can be achieved by interdependent regulation of floral
homeotic genes. One aspect of floral plasticity may be achieved by
regulation of the activity of a stamen-generating ring meristem and
first ideas on its control are presented. While the amazing conservation
of the major floral organ identity programme is being unravelled by
analysing floral homeotic gene function and expression, we are only just
beginning to understand the evolution of the gene network governing the
organ identity genes, e.g. how plasticity can be achieved, and which
aspects foster the robustness of the core eudicot floral bauplan.

Harvard-Zitierstil: Becker, A. (2016) Tinkering with transcription factor networks for developmental robustness of Ranunculales flowers, Annals of Botany, 117(5), pp. 845-858. https://doi.org/10.1093/aob/mcw037

APA-Zitierstil: Becker, A. (2016). Tinkering with transcription factor networks for developmental robustness of Ranunculales flowers. Annals of Botany. 117(5), 845-858. https://doi.org/10.1093/aob/mcw037