PuSH - Publication Server of Helmholtz Zentrum München: Salt stress induces the formation of a novel type of 'pressure wood' in two <em>Populus</em> species.

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Janz, D.* ; Lautner, S.* ; Wildhagen, H.* ; Behnke, K. ; Schnitzler, J.-P. ; Rennenberg, H.* ; Fromm, J.* ; Polle, A.*

Salt stress induces the formation of a novel type of 'pressure wood' in two Populus species.

New Phytol. 194, 129-141 (2012)

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Open Access Green as soon as Postprint is submitted to ZB.

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Salinity causes osmotic stress and limits biomass production of plants. The goal of this study was to investigate mechanisms underlying hydraulic adaptation to salinity. • Anatomical, ecophysiological and transcriptional responses to salinity were investigated in the xylem of a salt-sensitive (Populus × canescens) and a salt-tolerant species (Populus euphratica). • Moderate salt stress, which suppressed but did not abolish photosynthesis and radial growth in P. × canescens, resulted in hydraulic adaptation by increased vessel frequencies and decreased vessel lumina. Transcript abundances of a suite of genes (FLA, COB-like, BAM, XET, etc.) previously shown to be activated during tension wood formation, were collectively suppressed in developing xylem, whereas those for stress and defense-related genes increased. A subset of cell wall-related genes was also suppressed in salt-exposed P. euphratica, although this species largely excluded sodium and showed no anatomical alterations. Salt exposure influenced cell wall composition involving increases in the lignin : carbohydrate ratio in both species. • In conclusion, hydraulic stress adaptation involves cell wall modifications reciprocal to tension wood formation that result in the formation of a novel type of reaction wood in upright stems named 'pressure wood'. Our data suggest that transcriptional co-regulation of a core set of genes determines reaction wood composition.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords arabinogalactan protein; biomass; carbohydrate; fasciclin-like protein; phloem; salt transcriptome; wood; xylem

ISSN (print) / ISBN 0028-646X

e-ISSN 1469-8137

Journal New Phytologist

Quellenangaben Volume: 194, Issue: 1, Pages: 129-141

Publisher Wiley

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Environmental Simulation (EUS)