Genetic loci simultaneously controlling lignin monomers and biomass digestibility of rice straw

Scientific Reports
Zhen HuLingqiang Wang

Abstract

Lignin content and composition are crucial factors affecting biomass digestibility. Exploring the genetic loci simultaneously affecting lignin-relevant traits and biomass digestibility is a precondition for lignin genetic manipulation towards energy crop breeding. In this study, a high-throughput platform was employed to assay the lignin content, lignin composition and biomass enzymatic digestibility of a rice recombinant inbred line population. Correlation analysis indicated that the absolute content of lignin monomers rather than lignin content had negative effects on biomass saccharification, whereas the relative content of p-hydroxyphenyl unit and the molar ratio of p-hydroxyphenyl unit to guaiacyl unit exhibited positive roles. Eight QTL clusters were identified and four of them affecting both lignin composition and biomass digestibility. The additive effects of clustered QTL revealed consistent relationships between lignin-relevant traits and biomass digestibility. Pyramiding rice lines containing the above four positive alleles for increasing biomass digestibility were selected and showed comparable lignin content, decreased syringyl or guaiacyl unit and increased molar percentage of p-hydroxyphenyl unit, the molar ratio...Continue Reading

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Citations

Jan 10, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Kasper van der CruijsenLuisa M Trindade
Jan 30, 2021·Proceedings of the National Academy of Sciences of the United States of America·Antonio MolinaDeborah Goffner

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Methods Mentioned

BETA
dissection
genetic modifications

Software Mentioned

QTL IciMapping
iWALL
EXP
QTL Cartographer
IciMapping
MAPMAKER

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