The boundary-expressed EPIDERMAL PATTERNING FACTOR-LIKE2 gene encoding a signaling peptide promotes cotyledon growth during Arabidopsis thaliana embryogenesis

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  • Fujihara Rina
    Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Uchida Naoyuki
    Center for Gene Research, Nagoya University Institute of Transformative Bio-Molecules (ITbM), Nagoya University
  • Tameshige Toshiaki
    Kihara Institute for Biological Research, Yokohama City University Department of Biology, Faculty of Science, Niigata University
  • Kawamoto Nozomi
    Institute for Developmental Genetics, Heinrich-Heine University
  • Hotokezaka Yugo
    Faculty of Science, Kumamoto University
  • Higaki Takumi
    International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University
  • Simon Rüdiger
    Institute for Developmental Genetics, Heinrich-Heine University
  • Torii Keiko U
    Institute of Transformative Bio-Molecules (ITbM), Nagoya University Howard Hughes Medical Institute and Department of Molecular Biosciences, University of Texas at Austin
  • Tasaka Masao
    Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Aida Mitsuhiro
    International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University

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  • The boundary-expressed <i>EPIDERMAL PATTERNING FACTOR-LIKE2</i> gene encoding a signaling peptide promotes cotyledon growth during <i>Arabidopsis thaliana</i> embryogenesis

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<p>The shoot organ boundaries have important roles in plant growth and morphogenesis. It has been reported that a gene encoding a cysteine-rich secreted peptide of the EPIDERMAL PATTERNING FACTOR-LIKE (EPFL) family, EPFL2, is expressed in the boundary domain between the two cotyledon primordia of Arabidopsis thaliana embryo. However, its developmental functions remain unknown. This study aimed to analyze the role of EPFL2 during embryogenesis. We found that cotyledon growth was reduced in its loss-of-function mutants, and this phenotype was associated with the reduction of auxin response peaks at the tips of the primordia. The reduced cotyledon size of the mutant embryo recovered in germinating seedlings, indicating the presence of a factor that acted redundantly with EPFL2 to promote cotyledon growth in late embryogenesis. Our analysis suggests that the boundary domain between the cotyledon primordia acts as a signaling center that organizes auxin response peaks and promotes cotyledon growth.</p>

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