Atypical lignification in eastern leatherwood (Dirca palustris).
eastern leatherwood (Dirca palustris)
lignin
middle lamella
model of lignification
secondary cell walls
wood flexibility
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
05 2020
05 2020
Historique:
received:
28
08
2019
accepted:
11
12
2019
pubmed:
29
12
2019
medline:
15
5
2021
entrez:
29
12
2019
Statut:
ppublish
Résumé
Lignin is a complex phenolic biopolymer found mainly in the secondary cell walls of vascular plants, where it contributes to mechanical strength, water conduction, and plant defence. We studied the lignin of eastern leatherwood (Dirca palustris) because this slow-growing woody shrub is known for its flexible stems. Various analytical techniques and microscopy methods were employed to examine the composition and distribution of lignin and structural polysaccharides in leatherwood xylem in comparison with trembling aspen (Populus tremuloides) and white spruce (Picea glauca). We found that leatherwood has low overall levels of lignin, a high syringyl lignin content, and a unique distribution of lignin. Most remarkably, the cell corners and middle lamellae remain unlignified in mature xylem. These findings help explain the flexibility of leatherwood and also call into question the classical model of lignification, which purports that lignin polymerization begins in the cell corners and middle lamellae. This atypical lignification regime vividly illustrates the diversity in plant secondary cell wall formation that abounds in nature and casts leatherwood as a new model for the study of lignin biogenesis.
Identifiants
pubmed: 31883117
doi: 10.1111/nph.16394
pmc: PMC7187453
doi:
Substances chimiques
Lignin
9005-53-2
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
704-713Subventions
Organisme : Austrian Science Fund FWF
ID : Y 728
Pays : Austria
Informations de copyright
© 2019 The Authors New Phytologist © 2019 New Phytologist Trust.
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