Isolation of dominant Arabidopsis <i>seiv</i> mutants defective in VND7-induced xylem vessel cell differentiation

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  • Pawittra Phookaew
    Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology
  • Suzuki Takaomi
    Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology
  • Kawabe Harunori
    Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology
  • Takebayashi Arika
    RIKEN Center for Sustainable Resource Science
  • Demura Taku
    Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology RIKEN Center for Sustainable Resource Science
  • Ohtani Misato
    Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology RIKEN Center for Sustainable Resource Science Department of Integrated Biosciences, Graduate School of Frontier Sciences, The University of Tokyo

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  • Isolation of dominant Arabidopsis seiv mutants defective in VND7-induced xylem vessel cell differentiation

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<p>The plant-specific NAC transcription factor VASCULAR-RELATED NAC-DOMAIN 7 (VND7) functions in xylem vessel cell differentiation in Arabidopsis thaliana. To identify novel factors regulating xylem vessel cell differentiation, we previously performed ethyl methanesulfonate mutagenesis of a transgenic 35S::VND7-VP16-GR line in which VND7 activity can be induced post-translationally by glucocorticoid treatment. We successfully isolated mutants that fail to form ectopic xylem vessel cells named seiv (suppressor of ectopic vessel cell differentiation induced by VND7) mutants. Here, we isolated eight novel dominant seiv mutants: seiv2 to seiv9. In these seiv mutants, ectopic xylem vessel cell differentiation was inhibited in aboveground but not underground tissues. Specifically, the shoot apices of the mutants, containing shoot apical meristems and leaf primordia, completely lacked ectopic xylem vessel cells. In these mutants, the VND7-induced upregulation of downstream genes was reduced, especially in shoots compared to roots. However, endogenous xylem vessel cell formation was not affected in the seiv mutants. Therefore, the seiv mutations identified in this study have repressive effects on cell differentiation in shoot meristematic regions, resulting in inhibited ectopic xylem vessel cell differentiation.</p>

Journal

  • Plant Biotechnology

    Plant Biotechnology 37 (3), 311-318, 2020-09-25

    Japanese Society for Plant Biotechnology

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