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An AP2/ERF transcription factor ERF139 coordinates xylem cell expansion and secondary cell wall deposition
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 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: 0000-0001-7049-6978
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2019 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137Article in journal (Refereed) Epub ahead of print
Abstract [en]

Differentiation of xylem elements involves cell expansion, secondary cell wall (SCW) deposition and programmed cell death. Transitions between these phases require strict spatiotemporal control.

The function of Populus ERF139 (Potri.013G101100) in xylem differentiation was characterized in transgenic overexpression and dominant repressor lines of ERF139 in hybrid aspen (Populus tremula × tremuloides). Xylem properties, SCW chemistry and downstream targets were analyzed in both types of transgenic trees using microscopy techniques, Fourier transform‐infrared spectroscopy, pyrolysis‐GC/MS, wet chemistry methods and RNA sequencing.

Opposite phenotypes were observed in the secondary xylem vessel sizes and SCW chemistry in the two different types of transgenic trees, supporting the function of ERF139 in suppressing the radial expansion of vessel elements and stimulating accumulation of guaiacyl‐type lignin and possibly also xylan. Comparative transcriptomics identified genes related to SCW biosynthesis (LAC5, LBD15, MYB86) and salt and drought stress‐responsive genes (ANAC002, ABA1) as potential direct targets of ERF139.

The phenotypes of the transgenic trees and the stem expression profiles of ERF139potential target genes support the role of ERF139 as a transcriptional regulator of xylem cell expansion and SCW formation, possibly in response to osmotic changes of the cells.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2019.
Keywords [en]
cell expansion, ethylene response factor (ERF), hybrid aspen, lignin, Populus, secondary growth, xylem development
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-161696DOI: 10.1111/nph.15960ISI: 000474107100001PubMedID: 31125440OAI: oai:DiVA.org:umu-161696DiVA, id: diva2:1340595
Funder
Swedish Research Council Formas, 213-2011-1148Swedish Research Council Formas, 239-2011-1915The Kempe Foundations, SMK-1649The Kempe Foundations, SMK-1533Swedish Foundation for Strategic Research , RBP14-0011Knut and Alice Wallenberg Foundation, 2016-0341Bio4EnergyAvailable from: 2019-08-06 Created: 2019-08-06 Last updated: 2019-08-06

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Wessels, BernardSeyfferth, CarolinEscamez, SachaAntos, KamilTuominen, Hannele

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Wessels, BernardSeyfferth, CarolinEscamez, SachaVain, ThomasAntos, KamilDelhomme, NicolasKangasjarvi, JaakkoFelten, JudithTuominen, Hannele
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)Department of Integrative Medical Biology (IMB)
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New Phytologist
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