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Sphingolipid biosynthesis modulates plasmodesmal ultrastructure and phloem unloading

Nature Plants volume 5, pages 604–615 (2019)Cite this article

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A Publisher Correction to this article was published on 16 August 2019

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Abstract

During phloem unloading, multiple cell-to-cell transport events move organic substances to the root meristem. Although the primary unloading event from the sieve elements to the phloem pole pericycle has been characterized to some extent, little is known about post-sieve element unloading. Here, we report a novel gene, PHLOEM UNLOADING MODULATOR (PLM), in the absence of which plasmodesmata-mediated symplastic transport through the phloem pole pericycle–endodermis interface is specifically enhanced. Increased unloading is attributable to a defect in the formation of the endoplasmic reticulum–plasma membrane tethers during plasmodesmal morphogenesis, resulting in the majority of pores lacking a visible cytoplasmic sleeve. PLM encodes a putative enzyme required for the biosynthesis of sphingolipids with very-long-chain fatty acid. Taken together, our results indicate that post-sieve element unloading involves sphingolipid metabolism, which affects plasmodesmal ultrastructure. They also raise the question of how and why plasmodesmata with no cytoplasmic sleeve facilitate molecular trafficking.

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Fig. 1: Identification and characterization of plm mutants.
Fig. 2: Molecular characterization of PLM.
Fig. 3: PLM affects sphingolipid biosynthesis.
Fig. 4: GFP unloading into the root tip is enhanced in plm mutants.
Fig. 5: The plm-2 mutant lacks type II plasmodesmata at the PPP–endodermal interface of the unloading zone.

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All data underlying the findings are available from the corresponding authors on request.

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  • 16 August 2019

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Acknowledgements

This work was supported by the Finnish Centre of Excellence in Molecular Biology of Primary Producers (Academy of Finland CoE program 2014–2019, decision no. 271832), the Gatsby Foundation (GAT3395/PR3), the National Science Foundation Biotechnology and Biological Sciences Research Council grant (BB/N013158/1), the University of Helsinki (award 799992091), the European Research Council Advanced Investigator Grant SYMDEV (no. 323052) and the European Research Council under the European Union’s Horizon 2020 research and innovation programme (grant no. 772103-BRIDGING to E.M.B.). J.D.P. is funded by a PhD fellowship from the Formation à la Recherche dans l’Industrie et l’Agriculture (grant no. 1.E.096.18), Belgium. This work was also funded as part of the US Department of Energy Joint BioEnergy Institute (http://www.jbei.org) supported by the US Department of Energy, Office of Science, Office of Biological and Environmental Research, through contract DE-AC02-05CH11231 between the Lawrence Berkeley National Laboratory and the US Department of Energy. We thank R. Wightman for assistance with confocal imaging, M. Bourdon for help in conducting immunolocalization and K. Abley for help with the seed germination assay. The SB-EM imaging was supported by the Biocenter Finland (I.B. and E.J.), and we thank M. Lindman, A. Salminen and M. Veikkolainen for sample preparation for SB-EM. We thank M. Roth and R. Welti for polar lipid analysis, A. Shevchenko and K. Schuchmann for sphingomyelin analysis and P. Dupree for data interpretation. Electron tomography was performed at the plant pole of the Bordeaux Imaging Centre (http://www.bic.u-bordeaux.fr/). The Region Aquitaine also supported the acquisition of the electron microscope (grant no. 2011 13 04 007 PFM), and FranceBioImaging Infrastructure supported the acquisition of the AFS2 and ultra-microtome. The sterol analyses were performed at the Functional Genomic Center of Bordeaux, Metabolome/Lipidome platform (https://metabolome.cgfb.u-bordeaux.fr/en), funded by Grant MetaboHUB-ANR-11-INBS-0010.

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  1. William J. Nicolas

    Present address: Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA

  2. These authors contributed equally: Dawei Yan, Shri Ram Yadav.

Authors and Affiliations

  1. The Sainsbury Laboratory, University of Cambridge, Cambridge, UK

    Dawei Yan, Andrea Paterlini & Ykä Helariutta

  2. Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland

    Shri Ram Yadav, Ilya Belevich, Anne Vaten, Leila Karami, Sedeer el-Showk, Eija Jokitalo & Ykä Helariutta

  3. Department of Biotechnology, Indian Institute of Technology, Roorkee, India

    Shri Ram Yadav

  4. Laboratoire de Biogenèse Membranaire, UMR 5200, CNRS, Université de Bordeaux, Villenave d’Ornon, France

    William J. Nicolas, Jules D. Petit, Magali S. Grison & Emmanuelle M. Bayer

  5. Laboratoire de Biophysique Moléculaire aux Interfaces, TERRA Research Centre, GX ABT, Université de Liège, Gembloux, Belgium

    Jules D. Petit

  6. Bordeaux Imaging Centre, Plant Imaging Platform, UMS 3420, INRA-CNRS-INSERM, University of Bordeaux, Villenave-d’Ornon, France

    Lysiane Brocard

  7. Department of Horticulture, Faculty of Agriculture and Natural Resources, Persian Gulf University, Bushehr, Iran

    Leila Karami

  8. Department of Plant and Soil Sciences, Delaware Biotechnology Institute, University of Delaware, Newark, DE, USA

    Jung-Youn Lee

  9. Biosciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    Gosia M. Murawska & Jenny Mortimer

  10. Joint Bioenergy Institute, Emeryville, CA, USA

    Gosia M. Murawska & Jenny Mortimer

  11. School of Biological Sciences, Washington State University, Pullman, WA, USA

    Michael Knoblauch

  12. Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA

    Jennifer E. Markham

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Contributions

D.Y., A.P., S.R.Y., E.M.B. and Y.H. designed the experiments. D.Y., A.P., S.R.Y., E.M.B. and Y.H. wrote the manuscript with input from other authors. D.Y., S.R.Y., A.V. and J.-Y.L. generated the Arabidopsis lines. S.R.Y., A.V., L.K. and S.e.-S. carried out the suppressor screen and gene mapping. D.Y., S.R.Y. and A.P. performed the growth phenotype analysis. D.Y. and J.E.M. carried out the sphingolipid profiles, and M.S.G. carried out the sterol analyses. A.P., W.J.N., J.D.P. and L.B. carried out the electron tomography analysis with support from E.M.B. M.K. provided support for the FRAP experiment. A.P., E.J. and I.B. carried out the SB-EM analysis. G.M.M. and J.M. performed the GIPC glycosylation assay. J.D.P. carried out the transient co-expression assay. The rest of experiments were performed by D.Y.

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Correspondence to Emmanuelle M. Bayer or Ykä Helariutta.

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Yan, D., Yadav, S.R., Paterlini, A. et al. Sphingolipid biosynthesis modulates plasmodesmal ultrastructure and phloem unloading. Nat. Plants 5, 604–615 (2019). https://doi.org/10.1038/s41477-019-0429-5

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