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Ethylene signaling induces gelatinous layers with typical features of tension wood in hybrid aspen

View ORCID ProfileJudith Felten, Jorma Vahala, Jonathan Love, András Gorzsás, Markus Rüggeberg, Nicolas Delhomme, Joanna Leśniewska, Jaakko Kangasjärvi, Torgeir R. Hvidsten, Ewa J. Mellerowicz, Björn Sundberg
doi: https://doi.org/10.1101/204602
Judith Felten
1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
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  • ORCID record for Judith Felten
  • For correspondence: Judith.Felten@slu.se
Jorma Vahala
2Department of Biosciences, Division of Plant Biology, University of Helsinki, FI-00014, Helsinki, Finland
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Jonathan Love
1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
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András Gorzsás
3Department of Chemistry, Umeå University, SE-901 83 Umeå, Sweden
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Markus Rüggeberg
4Swiss Federal Institute of Technology Zurich (ETH Zurich), Institute for Building Materials, CH-8093 Zurich, Switzerland
5Swiss Federal Laboratories of Materials Science and Technology, Laboratory of Applied Wood Materials, CH-8600 Dubendorf, Switzerland
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Nicolas Delhomme
1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
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Joanna Leśniewska
6Institute of Biology, University in Białystok, Ciołkowskiego 1J, 15-245 Białystok, Poland
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Jaakko Kangasjärvi
2Department of Biosciences, Division of Plant Biology, University of Helsinki, FI-00014, Helsinki, Finland
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Torgeir R. Hvidsten
7Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-901 83 Umeå, Sweden
8Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, Norway
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Ewa J. Mellerowicz
1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
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Björn Sundberg
1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
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Summary

Research conducted The phytohormone ethylene impacts secondary stem growth in plants by stimulating cambial activity, xylem development and fiber over vessel formation. Here we report the effect of ethylene on secondary cell wall formation and the molecular connection between ethylene signaling and wood formation.

Methods We applied exogenous ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC) to wild type and ethylene insensitive hybrid aspen trees (Populus tremula x tremuloides) and studied secondary cell wall anatomy, chemistry and ultrastructure. We furthermore analyzed the transcriptome (RNA Seq) after ACC application to wild type and ethylene insensitive trees.

Key results We demonstrate that ACC and ethylene induce gelatinous-layers (G-layers) and alter the fiber cell wall cellulose microfibril angle. G-layers are tertiary wall layers rich in cellulose, typically found in tension wood of aspen trees. A vast majority of transcripts affected by ACC are downstream of ethylene perception and include a large number of transcription factors (TFs). Motif-analyses reveal potential connections between ethylene TFs (ERFs, EIN3/EIL1) and wood formation.

Conclusion G-layer formation upon ethylene application suggests that the increase in ethylene biosynthesis observed during tension wood formation is important for its formation. Ethylene-regulated TFs of the ERF and EIN3/EIL1 type could transmit the ethylene signal.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted October 17, 2017.
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Ethylene signaling induces gelatinous layers with typical features of tension wood in hybrid aspen
Judith Felten, Jorma Vahala, Jonathan Love, András Gorzsás, Markus Rüggeberg, Nicolas Delhomme, Joanna Leśniewska, Jaakko Kangasjärvi, Torgeir R. Hvidsten, Ewa J. Mellerowicz, Björn Sundberg
bioRxiv 204602; doi: https://doi.org/10.1101/204602
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Ethylene signaling induces gelatinous layers with typical features of tension wood in hybrid aspen
Judith Felten, Jorma Vahala, Jonathan Love, András Gorzsás, Markus Rüggeberg, Nicolas Delhomme, Joanna Leśniewska, Jaakko Kangasjärvi, Torgeir R. Hvidsten, Ewa J. Mellerowicz, Björn Sundberg
bioRxiv 204602; doi: https://doi.org/10.1101/204602

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