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Insights into Hardwood Xylan Synthesis and Differential Gene Expression in Arabidopsis and Willow

This study presents supplementary figures illustrating key aspects of hardwood xylan structure and gene expression in plants. Schematic structures of xylan components, including glucuronic acid and xylose, are highlighted. Phylogenetic trees demonstrate the relationships between willow cDNA sequences and corresponding Arabidopsis and poplar genes, with consensus trees based on protein sequence alignments. Differential expression patterns of IRX10 transcripts in seedlings are showcased alongside control sections to validate findings, enhancing understanding of xylan biosynthesis mechanisms in plants.

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Insights into Hardwood Xylan Synthesis and Differential Gene Expression in Arabidopsis and Willow

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  1. IRX9, IRX10, IRX14 GUX TBL29 GXM IRX7, IRX8, PARVUS Supplementary Figure S1. Schematic structure of hardwood xylan. GlcA, glucuronic acid; Me, methyl; Ac, acetyl; Xyl, xylose. Arabidopsis genes most closely associated with synthesis of these features in Arabidopsis xylan are indicated.

  2. Supplementary Figure S2. Phylogenetic trees showing the relationship between the willow cDNA sequences cloned to make in situ probes and the Arabidopsis and poplar genes in the same clades. Multiple alignments of protein sequences generated by MUSCLE were used to generate consensus trees using PHYML with WAG model from 500 bootstrap runs, visualised using Geneious package.

  3. Supplementary Figure S3. Amino acid alignments of three willow transcripts selected for in situ probes to closest Arabidopsis and poplar homologues.

  4. Supplementary Figure S4. Example of differential expression of IRX10 transcripts around the stem in a 4-week plantlet. Bar = 250µm.

  5. Supplementary Figure S5. Control sections showing no staining. a 4-week old stem hybridized with the IRX10 sense probe b 6-week old stem hybridized with the IRX9 sense probe. Bars: 100 µm.

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