Lignin Metabolic Engineering in Grass Biomass Plants for Primary Lignin Valorization

Umezawa Toshiaki

doi:10.2524/jtappij.74.1067

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リグニン代謝工学によるバイオマス植物の育種
リグニンタイシャコウガクニヨルバイオマスショクブツノイクシュ
Lignin metabolic engineering in grasses for primary lignin valorization

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Abstract

<p>Trees and large-sized grasses are the major sources of lignocellulose biomass, which is indispensable for establishing sustainable societies. Large-sized grasses have much higher lignocellulose biomass yields than trees. With an overall aim to improve lignocellulose usability, it is important to improve lignin content and simplify lignin structures in biomass plants. In this context, using rice as a model for grass biomass plants, we produced transgenic lines with increased lignin content, which should be beneficial for the solid fuel use of biomass. We also generated transgenic rice lines with increased content of each of the three aromatic （i.e., p-hydroxyphenyl, guaiacyl, and syringyl） units of lignins. This helped to simplify the aromatic composition of lignins. These strategies are also applicable for the improvement of usability of large-sized grasses. In addition, in-depth lignin analyses of transgenic rice plants suggested the presence of a biosynthetic pathway that produces the grass-specific β-p-coumaroylated monolignols.</p>

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JAPAN TAPPI JOURNAL

JAPAN TAPPI JOURNAL 74 (11), 1067-1070, 2020

JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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