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- W2023234295 abstract "<h3>Abstract</h3> The lignin biosynthetic pathway is highly conserved in angiosperms, yet pathway manipulations give rise to a variety of taxon-specific outcomes. Knockout of lignin-associated <i>4-coumarate:CoA ligases</i> (<i>4CLs</i>) in herbaceous species mainly reduces guaiacyl (G) lignin and enhances cell wall saccharification. Here we show that CRISPR-knockout of <i>4CL1</i> in <i>Populus tremula</i> × <i>alba</i> preferentially reduced syringyl (S) lignin, with negligible effects on biomass recalcitrance. Concordant with reduced S-lignin was downregulation of <i>ferulate 5-hydroxylases</i> (<i>F5Hs</i>). Lignification was largely sustained by 4CL5, a low-affinity paralog of 4CL1 typically with only minor xylem expression or activity. Levels of caffeate, the preferred substrate of 4CL5, increased in line with significant upregulation of <i>caffeoyl shikimate esterase1</i>. Upregulation of <i>caffeoyl-CoA O-methyltransferase1</i> and downregulation of <i>F5Hs</i> are consistent with preferential funneling of 4CL5 products toward G-lignin biosynthesis at the expense of S-lignin. Thus, transcriptional and metabolic adaptations to <i>4CL1</i>-knockout appear to have enabled 4CL5 catalysis at a level sufficient to sustain lignification. Finally, genes involved in sulfur assimilation, the glutathione-ascorbate cycle and various antioxidant systems were upregulated in the mutants, suggesting cascading responses to perturbed thioesterification in lignin biosynthesis. <h3>One sentence summary</h3> Knockout of lignin-associated <i>4CL1</i> in <i>Populus</i> reveals a 4CL5-dependent, caffeate-modulated compensatory pathway for lignification with links to thiol redox balance and sulfur assimilation." @default.
- W2023234295 created "2016-06-24" @default.
- W2023234295 creator A5034005365 @default.
- W2023234295 date "1971-07-01" @default.
- W2023234295 modified "2023-10-14" @default.
- W2023234295 title "Motor Learning and Human Performance" @default.
- W2023234295 doi "https://doi.org/10.1136/bjsm.5.4.239" @default.
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