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APL regulates vascular tissue identity in Arabidopsis

Author

Listed:
  • Martin Bonke

    (Plant Molecular Biology Laboratory, Institute of Biotechnology, University of Helsinki)

  • Siripong Thitamadee

    (Plant Molecular Biology Laboratory, Institute of Biotechnology, University of Helsinki)

  • Ari Pekka Mähönen

    (Plant Molecular Biology Laboratory, Institute of Biotechnology, University of Helsinki)

  • Marie-Theres Hauser

    (BOKU - University of Natural Resources and Applied Life Sciences Vienna)

  • Ykä Helariutta

    (Plant Molecular Biology Laboratory, Institute of Biotechnology, University of Helsinki)

Abstract

Vascular plants have a long-distance transport system consisting of two tissue types with elongated cell files, phloem and xylem1. Phloem has two basic cell types, enucleate sieve elements and companion cells. Xylem has various lignified cell types, such as tracheary elements, the differentiation of which involves deposition of elaborate cell wall thickenings and programmed cell death1,2,3,4. Until now, little has been known about the genetic control of phloem–xylem patterning. Here we identify the ALTERED PHLOEM DEVELOPMENT (APL) gene, which encodes a MYB coiled-coil-type transcription factor that is required for phloem identity in Arabidopsis. Phloem is established through asymmetric cell divisions and subsequent differentiation. We show that both processes are impaired by a recessive apl mutation. This is associated with the formation of cells that have xylem characteristics in the position of phloem. The APL expression profile is consistent with a key role in phloem development. Ectopic APL expression in the vascular bundle inhibits xylem development. Our studies suggest that APL has a dual role both in promoting phloem differentiation and in repressing xylem differentiation during vascular development.

Suggested Citation

  • Martin Bonke & Siripong Thitamadee & Ari Pekka Mähönen & Marie-Theres Hauser & Ykä Helariutta, 2003. "APL regulates vascular tissue identity in Arabidopsis," Nature, Nature, vol. 426(6963), pages 181-186, November.
    • Handle: RePEc:nat:nature:v:426:y:2003:i:6963:d:10.1038_nature02100
    DOI: 10.1038/nature02100
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    Cited by:

    1. Qian Wang & A. Cecilia Aliaga Fandino & Moritz Graeff & Thomas A. DeFalco & Cyril Zipfel & Christian S. Hardtke, 2023. "A phosphoinositide hub connects CLE peptide signaling and polar auxin efflux regulation," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. Manuel Neumann & Xiaocai Xu & Cezary Smaczniak & Julia Schumacher & Wenhao Yan & Nils Blüthgen & Thomas Greb & Henrik Jönsson & Jan Traas & Kerstin Kaufmann & Jose M. Muino, 2022. "A 3D gene expression atlas of the floral meristem based on spatial reconstruction of single nucleus RNA sequencing data," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    3. Eva-Sophie Wallner & Nina Tonn & Dongbo Shi & Laura Luzzietti & Friederike Wanke & Pascal Hunziker & Yingqiang Xu & Ilona Jung & Vadir Lopéz-Salmerón & Michael Gebert & Christian Wenzl & Jan U. Lohman, 2023. "OBERON3 and SUPPRESSOR OF MAX2 1-LIKE proteins form a regulatory module driving phloem development," Nature Communications, Nature, vol. 14(1), pages 1-16, December.

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