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Title: ANATOMICAL AND MECHANICAL CHARACTERISTICS OF LEAF-SHEATH FIBROVASCULAR BUNDLES IN PALMS
Authors: Zhai, Shengcheng
Imai, Tomoya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-7026-0287 (unconfirmed)
Horikawa, Yoshiki
Sugiyama, Junji  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5388-4925 (unconfirmed)
Keywords: Klason lignin; fibrovascular bundle
tensile strength
Arecaceae
vascular tissue
MFA
Issue Date: 2013
Publisher: Koninklijke Brill NV
Journal title: IAWA Journal
Volume: 34
Issue: 3
Start page: 285
End page: 300
Abstract: This study presents anatomical characteristics, mechanical properties, microfibril angles (MFAs) and Klason lignin contents of leaf-sheath fibrovascular bundles from 14 palm genera (18 species). Observed by light microscopy, all fibrovascular bundles consisted equally of thick-walled sclerenchyma fibers and vascular tissue, while the shape and localization of vascular tissues on the transverse sections varied among species. It was possible to group these fibrovascular bundles into 3 types based on the vascular tissue’s differences: type A – rounded in the central region; type B – angular in the marginal region; and type C – aliform in the central region. These three anatomical types of fibrovascular bundles showed some correlation with a current phylogenetic classification of palm species. Through mechanical tests, this research confirmed the correlation between diameter and mechanical properties of the fibrovascular bundles of palms; tensile strength and Young’s modulus showed a decreasing trend with increasing diameter. We clarified that this trend was due to a marked increase in the proportion of transverse sectional area comprised by vascular tissue with increasing diameter of fibrovascular bundles. The MFAs of fibrovascular bundles ranged from 10.3º to 47.1º, which were generally larger than those of non-woody plants, conifers, and broad-leaved trees. The Klason lignin contents of palm species were also high, ranging from 18.3% to 37.8%, with a mean value of 29.6%. These large MFAs and high lignin contents could lead to the long-term plastic deformation and relatively low tensile strength of palm fibrovascular bundles.
Rights: © International Association of Wood Anatomists, 2013 Published by Koninklijke Brill NV, Leiden
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/180656
DOI(Published Version): 10.1163/22941932-00000024
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