Functional Divergence of MYB-Related Genes, WEREWOLF and AtMYB23 in Arabidopsis

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  • TOMINAGA-WADA Rumi
    Interdisciplinary Research Organization, University of Miyazaki Interdisciplinary Research Organization, University of Miyazaki
  • NUKUMIZU Yuka
    Interdisciplinary Research Organization, University of Miyazaki Interdisciplinary Research Organization, University of Miyazaki
  • SATO Shusei
    Kazusa DNA Research Institute Kazusa DNA Research Institute
  • KATO Tomohiko
    Kazusa DNA Research Institute Kazusa DNA Research Institute
  • TABATA Satoshi
    Kazusa DNA Research Institute Kazusa DNA Research Institute
  • WADA Takuji
    Interdisciplinary Research Organization, University of Miyazaki Interdisciplinary Research Organization, University of Miyazaki

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  • Functional Divergence of MYB-Related Genes, <i>WEREWOLF</i> and <i>AtMYB23</i> in <i>Arabidopsis</i>

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Epidermal cell differentiation in Arabidopsis is studied as a model system to understand the mechanisms that determine the developmental end state of plant cells. MYB-related transcription factors are involved in cell fate determination. To examine the molecular basis of this process, we analyzed the functional relationship of two R2R3-type MYB genes, AtMYB23 (MYB23) and WEREWOLF (WER). MYB23 is involved in leaf trichome formation. WER represses root-hair formation. Swapping domains between MYB23 and WER, we found that a low homology region of MYB23 might be involved in ectopic trichome initiation on hypocotyls. MYB23 and all MYB23-WER (MW) chimeric transgenes rescued the increased root-hair phenotype of the wer-1 mutant. Although WER did not rescue the gl1-1 no-trichome phenotype, MYB23 and all MW chimeric transgenes rescued gl1-1. These results suggest that MYB23 acquired a specific function for trichome differentiation during evolution.

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