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  • 1.
    Felten, Judith
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Vahala, Jorma
    Love, Jonathan
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Gorzsas, Andras
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Ruggeberg, Markus
    Delhomme, Nicolas
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Lesniewska, Joanna
    Kangasjarvi, Jaakko
    Hvidsten, Torgeir R.
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, As, Norway.
    Mellerowicz, Ewa J.
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Sundberg, Björn
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Ethylene signaling induces gelatinous layers with typical features of tension wood in hybrid aspen2018In: New Phytologis, Vol. 218, no 3, p. 999-1014Article in journal (Refereed)
    Abstract [en]
    • The phytohormone ethylene impacts secondary stem growth in plants by stimulating cambial activity, xylem development and fiber over vessel formation.
    • We report the effect of ethylene on secondary cell wall formation and the molecular connection between ethylene signaling and wood formation. We applied exogenous ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC) to wild-type and ethylene-insensitive hybrid aspen trees (Populus tremulaxtremuloides) 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.
    • 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 (Ethylene Response Factors (ERFs), ETHYLENE INSENSITIVE 3/ETHYLENE INSENSITIVE3-LIKE1 (EIN3/EIL1)) and wood formation.
    • 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.
    Publisher's full text
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