Fig. 5

Scatter plots showing expression bias of homeologs in the studied allotetraploid transcriptomes. a, b Data from stem apex. c, d Data from leaf tissue. a, c for A. alpina. b, d for A. wilsoniana. The abscissa is Rp [log₂ (A. acuminata/A. asiatica)], and the ordinate is Rh [log₂ (acu-homeolog/asi-homeolog)]. Black circles correspond to homeolog pairs without expression bias; blue circles correspond to the homeolog pairs with expression bias toward A. acuminata (namely C-bias); and red circles correspond to homeolog pairs with biased expression of the A. asiatica-copy (namely S-bias) (P-value < 0.05, FDR < 0.01, Fisher’s exact text). Numbers at the upper left corner indicate the number of homeolog pairs of each category