Fig 4. Transcriptomic profiling of steroidal saponin pathway in the root, bulb and leaf of Allium cepa Aggregatum group (AA) and monosomic addition lines (MALs = FF1A, FF2A, FF3A, FF4A, FF5A, FF6A, FF7A and FF8A) as compared with A. fistulosum (FF) as control.

(A) Schematic representation of the steroidal saponin biosynthesis pathway and heatmap clustering of the 50 unigene detected in this study which functionally involved in the upstream (B) and downstream (C) saponin biosynthesis pathway. Heatmap constructed using FPKM log2 fold change.