Journal Article

Anatomy and lignin distribution in reaction phloem fibres of several Japanese hardwoods

Kaori Nakagawa, Arata Yoshinaga and Keiji Takabe

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 110, issue 4, pages 897-904
Published in print September 2012 | ISSN: 0305-7364
Published online July 2012 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcs144
Anatomy and lignin distribution in reaction phloem fibres of several Japanese hardwoods

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  • Ecology and Conservation
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Background and Aims

Although tension wood formation and the structure of gelatinous fibres (G-fibres) have been widely investigated, studies of the influence of the reaction phenomenon on phloem fibres have been few and incomplete in comparison with those of xylem wood fibres. This study was undertaken to clarify the influence of stem inclination on phloem fibres using several Japanese hardwood species that produce different G-fibre types in tension wood.

Methods

Eight hardwood species were inclined at 30–45° at the beginning of April. Specimens were collected in July and December. The cell-wall structure and lignin distribution of phloem fibres on both the tension and opposite sides were compared by light microscopy, ultraviolet microscopy, confocal laser scanning microscopy after staining with acriflavine, and transmission electron microscopy after staining with potassium permanganate.

Key Results

Three types of changes were found in tension-side phloem fibres: (1) increases in the proportion of the syringyl unit in lignin in the S1 and S2 layers and compound middle lamella (Cercidiphyllum japonicum), (2) formation of unlignified gelatinous layers (Melia azedarach and Acer rufinerve) and (3) increases in the number of layers (n) in the multi-layered structure of S1 + S2 + n (G + L) (Mallotus japonicus). Other species showed no obvious change in cell-wall structure or lignin distribution.

Conclusions

Phloem fibres of the tree species examined in our study showed three types of changes in lignin distribution and cell-wall structure. The reaction phenomenon may vary with tree species and may not be closely related to G-fibre type in tension wood.

Keywords: Phloem fibre; lignification; reaction phloem; Cercidiphyllum japonicum; Melia azedarach; Acer rufinerve; Mallotus japonicus; Celtis sinensis; Aphananthe aspera; Corylus sieboldiana; Magnolia salicifolia

Journal Article.  4487 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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