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Title: Comparative evaluations of lignocellulose reactivity and usability in transgenic rice plants with altered lignin composition
Authors: Takeda, Yuri
Tobimatsu, Yuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7578-7392 (unconfirmed)
Yamamura, Masaomi
Takano, Toshiyuki  kyouindb  KAKEN_id
Sakamoto, Masahiro
Umezawa, Toshiaki
Author's alias: 武田, ゆり
飛松, 裕基
山村, 正臣
髙野, 俊幸
坂本, 正弘
梅澤, 俊明
Keywords: p-Coumaroyl ester 3-hydroxylase
Coniferaldehyde 5-hydroxylase
Enzymatic saccharification
Heating value
Grass biomass
Issue Date: 13-Feb-2019
Publisher: Springer Nature
Journal title: Journal of Wood Science
Volume: 65
Thesis number: 6
Abstract: The aromatic composition of lignins is considered an important trait that affects the physico-chemical properties of lignocellulosic biomass. However, our knowledge of the relationship between lignin structure and biomass utilization properties remains limited, especially in monocotyledonous grass species, despite their potential as biomass feedstocks. In this study, we used recently produced rice transgenic lines with distinct lignin monomer compositions, i.e., guaiacyl (G)/syringyl (S)/p-hydroxyphenyl (H) aromatic unit ratios, to study the impact of lignin composition on the chemical reactivity, enzymatic saccharification efficiency and calorific value of rice lignocellulose. The H-lignin-enriched rice transgenic line showed significantly enhanced biomass saccharification efficiency after alkali and acid pretreatments and even without any pretreatment, whereas the S-lignin-enriched rice transgenic line displayed enhanced saccharification efficiency after liquid hot water pretreatment. While we detected no significant differences in biomass heating values between the transgenic rice materials tested, analysis of synthetic lignins comprising only G, S or H units suggested that increased ratios of G or H units could increase the heating value of lignin-based solid biofuels.
Rights: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
URI: http://hdl.handle.net/2433/236641
DOI(Published Version): 10.1186/s10086-019-1784-6
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