Fig. 3.

Salix purpurea differential expression (DE) transcript distribution and abundance (transcripts per million, tpm) weighted fold change (log₂). Top: fold change (FC log₂) distribution of DE genes contaminated (black) and non-contaminated (gold). Bottom: mean transcript counts (tpm) difference between conditions against fold change per DE contig. The highly abundant transcripts discussed within the text are labelled. A full DE transcript list including expression data, functional description (if available), gene ontology terms (if available) and secondary annotation (if available) is provided in Additional file 5. PIP plasma membrane intrinsic protein (aquaporin), GST glutathione S-transferase