Transcriptional integration of paternal and maternal factors in the Arabidopsis zygote

Minako Ueda, Ernst Aichinger, Wen Gong, Edwin Groot, Inge Verstraeten, Lam Dai Vu, Ive De Smet, Tetsuya Higashiyama, Masaaki Umeda, Thomas Laux

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)


In many plants, the asymmetric division of the zygote sets up the apical-basal axis of the embryo. Unlike animals, plant zygotes are transcriptionally active, implying that plants have evolved specific mechanisms to control transcriptional activation of patterning genes in the zygote. In Arabidopsis, two pathways have been found to regulate zygote asymmetry: YODA (YDA) mitogen-activated protein kinase (MAPK) signaling, which is potentiated by sperm-delivered mRNA of the SHORT SUSPENSOR (SSP) membrane protein, and up-regulation of the patterning gene WOX8 by the WRKY2 transcription factor. How SSP/YDA signaling is transduced into the nucleus and how these pathways are integrated have remained elusive. Here we show that paternal SSP/YDA signaling directly phosphorylates WRKY2, which in turn leads to the up-regulation of WOX8 transcription in the zygote. We further discovered the transcription factors HOMEODOMAIN GLABROUS11/12 (HDG11/12) as maternal regulators of zygote asymmetry that also directly regulate WOX8 transcription. Our results reveal a framework of how maternal and paternal factors are integrated in the zygote to regulate embryo patterning.

Original languageEnglish
Pages (from-to)617-627
Number of pages11
JournalGenes and Development
Issue number6
Publication statusPublished - 2017 Mar 15


  • MAPK signaling
  • WOX8
  • maternal factors
  • zygote asymmetry


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