Research ArticlePlant biology

LEAFY Controls Auxin Response Pathways in Floral Primordium Formation

Science Signaling  09 Apr 2013:
Vol. 6, Issue 270, pp. ra23
DOI: 10.1126/scisignal.2003937

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Signals to Blossom

In Arabidopsis thaliana, the transcription factor LEAFY (LFY) stimulates flower development, and the formation of floral and leaf primordial tissue is stimulated by the hormone auxin. Li et al. identified a genetic interaction between LFY and the kinase PINOID, which regulates auxin transport and the localization of auxin signaling. In plants null for lfy, auxin signaling in the developing floral tissue was reduced despite increased auxin concentration and auxin biosynthesis. LFY inhibited the expression of genes encoding enzymes in the auxin biosynthetic pathway. Reporter analysis of plants with various genetic mutations indicated that auxin signaling preceded and stimulated LFY production in developing flowers. Thus, there is complex interplay, involving feedback loops, between transcriptional and hormonal regulation of flower development.