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Compositional characterization and imaging of “wall-bound” acylesters of Populus trichocarpa reveal differential accumulation of acyl molecules in normal and reactive woods

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Abstract

Acylesterification is one of the common modifications of cell wall non-cellulosic polysaccharides and/or lignin primarily in monocot plants. We analyzed the cell-wall acylesters of black cottonwood (Populus trichocarpa Torr. & Gray) with liquid chromatography–mass spectrometry (LC–MS), Fourier transform-infrared (FT-IR) microspectroscopy, and synchrotron infrared (IR) imaging facility. The results revealed that the cell wall of dicotyledonous poplar, as the walls of many monocot grasses, contains a considerable amount of acylesters, primarily acetyl and p-hydroxycinnamoyl molecules. The “wall-bound” acetate and phenolics display a distinct tissue specific-, bending stress responsible- and developmental-accumulation pattern. The “wall-bound” p-coumarate predominantly accumulated in young leaves and decreased in mature leaves, whereas acetate and ferulate mostly amassed in the cell wall of stems. Along the development of stem, the level of the “wall-bound” ferulate gradually increased, while the basal level of p-coumarate further decreased. Induction of tension wood decreased the accumulation of the “wall-bound” phenolics while the level of acetate remained constant. Synchrotron IR-mediated chemical compositional imaging revealed a close spatial distribution of acylesters with cell wall polysaccharides in poplar stem. These results indicate that different “wall-bound” acylesters play distinct roles in poplar cell wall structural construction and/or metabolism of cell wall matrix components.

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Abbreviations

FT-IR:

Fourier-transform infrared

IR:

Infrared

LC–MS:

Liquid chromatography–mass spectrometry

GalA:

Galacturonic acid

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Acknowledgments

The authors would like to thank Dr. Gray Tuskan in Oak Ridge National Laboratory for providing additional P. trichocarpa plantlets. This work was supported by the DOE-USDA joint Plant Feedstock Genomics Program (Project No. Bo-135) and the Laboratory Directed Research and Development Program (LDRD-07-047) of Brookhaven National Laboratory under contract with Department of Energy to Chang-Jun Liu. Use of the National Synchrotron Light source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.

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Authors and Affiliations

  1. Department of Biology, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Jin-Ying Gou, Xiao-Hong Yu & Chang-Jun Liu

  2. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Simone Park & Lisa M. Miller

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  1. Jin-Ying Gou
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  2. Simone Park
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Correspondence to Chang-Jun Liu.

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Gou, JY., Park, S., Yu, XH. et al. Compositional characterization and imaging of “wall-bound” acylesters of Populus trichocarpa reveal differential accumulation of acyl molecules in normal and reactive woods. Planta 229, 15–24 (2008). https://doi.org/10.1007/s00425-008-0799-9

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