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Ethylene Signaling Is Required for Fully Functional Tension Wood in Hybrid Aspen
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0002-8962-3778
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0003-0717-1630
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2019 (English)In: Frontiers in Plant Science, ISSN 1664-462X, E-ISSN 1664-462X, Vol. 10, article id 1101Article in journal (Refereed) Published
Abstract [en]

Tension wood (TW) in hybrid aspen trees forms on the upper side of displaced stems to generate a strain that leads to uplifting of the stem. TW is characterized by increased cambial growth, reduced vessel frequency and diameter, and the presence of gelatinous, cellulose-rich (G-)fibers with its microfibrils oriented parallel to the fiber cell axis. Knowledge remains limited about the molecular regulators required for the development of this special xylem tissue with its characteristic morphological, anatomical, and chemical features. In this study, we use transgenic, ethylene-insensitive (ETI) hybrid aspen trees together with time-lapse imaging to show that functional ethylene signaling is required for full uplifting of inclined stems. X-ray diffraction and Raman microspectroscopy of TW in ETI trees indicate that, although G-fibers form, the cellulose microfibril angle in the G-fiber S-layer is decreased, and the chemical composition of S- and G-layers is altered than in wild-type TW. The characteristic asymmetric growth and reduction of vessel density is suppressed during TW formation in ETI trees. A genome-wide transcriptome profiling reveals ethylene-dependent genes in TW, related to cell division, cell wall composition, vessel differentiation, microtubule orientation, and hormone crosstalk. Our results demonstrate that ethylene regulates transcriptional responses related to the amount of G-fiber formation and their properties (chemistry and cellulose microfibril angle) during TW formation. The quantitative and qualitative changes in G-fibers are likely to contribute to uplifting of stems that are displaced from their original position.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019. Vol. 10, article id 1101
Keywords [en]
xylem, wood, ethylene, tension wood, lignin, microfibril angle, Raman microspectroscopy, transcriptomics
National Category
Forest Science
Identifiers
URN: urn:nbn:se:umu:diva-164043DOI: 10.3389/fpls.2019.01101ISI: 000487981600001OAI: oai:DiVA.org:umu-164043DiVA, id: diva2:1361329
Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15Bibliographically approved

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Seyfferth, CarolinWessels, Bernard A.Gorzsás, AndrásAntos, KamilTuominen, Hannele
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)Department of ChemistryDepartment of Integrative Medical Biology (IMB)
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