数字农科院2.0

Developmental changes in lignin composition are driven by both monolignol supply and laccase specificity

文献类型： 外文期刊

作者： Chunliu Zhuo;Xin Wang;Maite Docampo-Palacios;Brian C. Sanders;Nancy L. Engle;Timothy J. Tschaplinski;John I. Hendry;Costas D. Maranas;Fang Chen;Richard A. Dixon

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期刊名称： Science Advances

ISSN： 2375-2548

年卷期： 2022 年 8 卷 10 期

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收录情况： SCIE（2022版） ; EI（2022版）

摘要： The factors controlling lignin composition remain unclear. Catechyl (C)-lignin is a homopolymer of caffeyl alcohol with unique properties as a biomaterial and precursor of industrial chemicals. The lignin synthesized in the seed coat of Cleome hassleriana switches from guaiacyl (G)- to C-lignin at around 12 to 14 days after pollination (DAP), associated with a rerouting of the monolignol pathway. Lack of synthesis of caffeyl alcohol limits C-lignin formation before around 12 DAP, but coniferyl alcohol is still synthesized and highly accumulated after 14 DAP. We propose a model in which, during C-lignin biosynthesis, caffeyl alcohol noncompetitively inhibits oxidation of coniferyl alcohol by cell wall laccases, a process that might limit movement of coniferyl alcohol to the apoplast. Developmental changes in both substrate availability and laccase specificity together account for the metabolic fates of G- and C-monolignols in the Cleome seed coat.

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