4.5 Article

Regulation of acetylation of plant cell wall components is complex and responds to external stimuli

Journal

PLANT SIGNALING & BEHAVIOR
Volume 15, Issue 1, Pages -

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/15592324.2019.1687185

Keywords

O-acetylation; cell wall; photomorphogenesis; oligogalacturonides; xyloglucan; pectin; zinc; reduced wall acetylation; trichome birefringence; TBR; RWA; etiolation; de-etiolation; skotomorphogenesis; oligosaccharide Mass Profiling; OLIMP

Funding

  1. Deutsche Forschungsgemeinschaft (DFG) [Kr1967/3-3, Kr1967/15-1]

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Previously, we reported that the allelic de-etiolated by zinc (dez) and trichome birefringence (tbr) mutants exhibit photomorphogenic development in the dark, which is enhanced by high Zn. TRICHOME BIREFRINGENCE-LIKE proteins had been implicated in transferring acetyl groups to various hemicelluloses. Pectin O-acetylation levels were lower in dark-grown dez seedlings than in the wild type. We observed Zn-enhanced photomorphogenesis in the dark also in the reduced wall acetylation 2 (rwa2-3) mutant, which exhibits lowered O-acetylation levels of cell wall macromolecules including pectins and xyloglucans, supporting a role for cell wall macromolecule O-acetylation in the photomorphogenic phenotypes of rwa2-3 and dez. Application of very short oligogalacturonides (vsOGs) restored skotomorphogenesis in dark-grown dez and rwa2-3. Here we demonstrate that in dez, O-acetylation of non-pectin cell wall components, notably of xyloglucan, is enhanced. Our results highlight the complexity of cell wall homeostasis and indicate against an influence of xyloglucan O-acetylation on light-dependent seedling development.

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