4.8 Article

SUPERMAN prevents class B gene expression and promotes stem cell termination in the fourth whorl of Arabidopsis thaliana flowers

Publisher

NATL ACAD SCIENCES
DOI: 10.1073/pnas.1705977114

Keywords

flower development; boundary formation; floral organ identity; stem cells; SUPERMAN

Funding

  1. National Science Foundation [IOS-0926347]
  2. Howard Hughes Medical Institute
  3. National Institutes of Health [R01 GM104244]
  4. Gordon and Betty Moore Foundation [GBMF3406]

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The molecular and genetic networks underlying the determination of floral organ identity are well studied, but much less is known about how the flower is partitioned into four developmentally distinct whorls. The SUPERMAN gene is required for proper specification of the boundary between stamens in whorl 3 and carpels in whorl 4, as superman mutants exhibit supernumerary stamens but usually lack carpels. However, it has remained unclear whether extra stamens in superman mutants originate from an organ identity change in whorl 4 or the overproliferation of whorl 3. Using live confocal imaging, we show that the extra stamens in superman mutants arise from cells in whorl 4, which change their fate from female to male, while floral stem cells proliferate longer, allowing for the production of additional stamens.

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