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Downregulation of C3'H Gene in Rice Alters Cell Wall Structures
Posted by: Prof. Dr. M. Raupp (IP Logged)
Date: June 26, 2018 08:34AM

p?\Coumaroyl ester 3?\hydroxylase (C3@H) is a key enzyme involved in the
synthesis of lignin, a major component in vascular plants' secondary cell
walls. Although the crucial role of C3@H in have been investigated, there
is limited information available for its role in monocotyledonous grass
species. The team of Yuri Takeda from Kyoto University in Japan studied the
effect of C3@H?\deficiency on the structure and properties of grass cell
walls.



C3@H?\knockdown lines generated via RNAi gene silencing, with approximately
0.5% of the normal expression level, reached maturity and set seeds.
Meanwhile, C3@H?\knockout rice mutants generated via CRISPR-Cas9
mutagenesis were severely dwarfed and sterile.



Analysis of the mature C3@H?\knockdown RNAi lines revealed that their
lignin were enriched in p?\hydroxyphenyl (H) units and had reduced levels of
the normally dominant guaiacyl (G) and syringyl (S) units. Suppression of C3
@H also resulted in substantial reduction in cell wall cross?\linking. The
C3@H?\suppressed rice exhibited enhanced biomass saccharification.



These data demonstrate that C3@H expression is an important determinant of
lignin content and composition as well as the degree of cell wall cross?\
linking.



[onlinelibrary.wiley.com]



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