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Maternal auxin supply contributes to early embryo patterning in Arabidopsis

Nature Plants volume 4, pages 548–553 (2018)Cite this article

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Abstract

The angiosperm seed is composed of three genetically distinct tissues: the diploid embryo that originates from the fertilized egg cell, the triploid endosperm that is produced from the fertilized central cell, and the maternal sporophytic integuments that develop into the seed coat1. At the onset of embryo development in Arabidopsis thaliana, the zygote divides asymmetrically, producing a small apical embryonic cell and a larger basal cell that connects the embryo to the maternal tissue2. The coordinated and synchronous development of the embryo and the surrounding integuments, and the alignment of their growth axes, suggest communication between maternal tissues and the embryo. In contrast to animals, however, where a network of maternal factors that direct embryo patterning have been identified3,4, only a few maternal mutations have been described to affect embryo development in plants5,6,7. Early embryo patterning in Arabidopsis requires accumulation of the phytohormone auxin in the apical cell by directed transport from the suspensor8,9,10. However, the origin of this auxin has remained obscure. Here we investigate the source of auxin for early embryogenesis and provide evidence that the mother plant coordinates seed development by supplying auxin to the early embryo from the integuments of the ovule. We show that auxin response increases in ovules after fertilization, due to upregulated auxin biosynthesis in the integuments, and this maternally produced auxin is required for correct embryo development.

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Fig. 1: Auxin accumulation in integuments.
Fig. 2: Auxin biosynthesis mutants display early embryonic defects.
Fig. 3: Sporophytic maternal early embryonic defects.

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Acknowledgements

We thank E. Groot for assistance with statistical analyses and for critical reading of the manuscript. We thank J. Alonso for providing wei8-1, wei8-1 tar1-1, pDR5:GFP wei8-1, and pTAA1:GFP-TAA1 seeds, G. Jürgens for providing pDR5:nls-3xGFP and pDR5:nls-3xGFP wei8-1 tar1-1 seeds, T. Vernoux for p35S:DII-VENUS and p35S:mDII-VENUS seeds and plasmids, R. Offringa for pSDM7010 and pSDM7012, L. Lepiniec for pBAN-pBS-SK, C.-Y. Liao and D. Weijers for R2D2 seeds, and T. Friedrich for valuable suggestions. Seeds of wei8-3 and wei-11 seeds were obtained from the European Arabidopsis Stock Center (NASC). We acknowledge the CEITEC core facility CELLIM supported by the MEYS CR (LM2015062 Czech-BioImaging), and the CEITEC core facility Plant Sciences. H.S.R. was supported by the SoMoProII program co-financed by the South-Moravian Region and the European Union, by the Ministry of Education, Youth and Sports of the Czech Republic within CEITEC 2020 (LQ1601) and by the Masaryk University. C.P. was supported by the Kwanjeong Educational Foundation. C.L.G. was supported by the Deutscher Akademischer Austauschdienst. W.G. was a post-doctoral fellow of the Research Foundation Flanders. B.W. was supported by the ‘NITKA’ project under European Social Fund UDA-POKL.04.03.00-00-168/12, realized at the University of Silesia, Katowice, Poland. A.P and O.N. were supported by the Czech Foundation Agency (GA17-21581Y) and the Ministry of Education, Youth and Sports of the Czech Republic via the National Program for Sustainability (LO1204). J.C. is a post-doctoral fellow supported by a grant from the Deutsche Forschungsgemeinschaft (Dr334/10) to T.D. This work was further supported by the European Research Council (FP7/2007-2013 / ERC-grant agreement no. 282300 to J.F.), and the Czech Science Foundation GACR (GA13-40637S) to J.F.; and by the Deutsche Forschungsgemeinschaft (La606/6, La606/13, La606/17 and ERA-CAPS program), and the EU 7th framework program (ITN SIREN) to T.L. This material reflects only the author’s views and the European Union is not liable for any use that may be made of the information contained therein.

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Author notes

  1. Chulmin Park

    Present address: Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna, Austria

  2. These authors contributed equally: Hélène S. Robert, Chulmin Park, Carla Loreto Gutièrrez.

Authors and Affiliations

  1. Mendel Centre for Genomics and Proteomics of Plants Systems, CEITEC MU - Central European Institute of Technology, Masaryk University, Brno, Czech Republic

    Hélène S. Robert & Barbara Wójcikowska

  2. Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB) and Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium

    Hélène S. Robert & Wim Grunewald

  3. BIOSS Centre for Biological Signaling Studies, Faculty of Biology, Albert-Ludwigs-Universitaet Freiburg, Freiburg, Germany

    Chulmin Park, Carla Loreto Gutièrrez & Thomas Laux

  4. Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland

    Barbara Wójcikowska

  5. Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science of Palacký University and Institute of Experimental Botany CAS, Olomouc, Czech Republic

    Aleš Pěnčík & Ondřej Novák

  6. Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, Regensburg, Germany

    Junyi Chen & Thomas Dresselhaus

  7. Institute of Science and Technology Austria (IST Austria), Klosterneuburg, Austria

    Jiří Friml

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Contributions

H.S.R., C.P. and C.L.G. contributed equally to this work and performed experiments. H.S.R., B.W., A.P. and O.N. collected samples and performed the analysis for the auxin measurements. W.G. participated in the backcrosses experiments. J.C. and T.D. provided the maize data. H.S.R., C.P., C.L.G., J.F. and T.L. designed the experiments, analysed the data and wrote the paper.

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Correspondence to Hélène S. Robert, Jiří Friml or Thomas Laux.

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Early embryo development requires auxin production in the surrounding maternal integuments.

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Supplementary Materials, Supplementary Figures 1–6, Supplementary Tables 1–3 and Supplementary References

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Robert, H.S., Park, C., Gutièrrez, C.L. et al. Maternal auxin supply contributes to early embryo patterning in Arabidopsis. Nature Plants 4, 548–553 (2018). https://doi.org/10.1038/s41477-018-0204-z

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