Figure S1 Gene construct and Southern hybridization analysis of transgenic switchgrass plants.

Figure S2 Phylogenetic analysis of the SPL family.

Figure S3 Transcript abundance of putative switchgrass SPLs in different organs of wild-type switchgrass plants. Inflorescence, internode, leaf sheath and leaf blade were collected at R1 stage.

Figure S4 AcBr lignin content of transgenic switchgrass biomass.

Table S1 Primers used for this study.

Table S2 Microarray analysis of the transgenic line T-44.

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