Fig. 3

Expression evolution of garlic genes. a Feature of gene expression in three examined garlic groups. The tracks from inside to outside represent the FPKM value of gene in OG, CG1, and CG2, and Shannon-Wiener index of transcript abundance in OG, CG1, CG2, and in all 81 investigated accessions. b Gene number with change of expression among OG, CG1, and CG2. LE and EE indicate the number of gene that lose expression and emerges expression during the domestication history. DE represents the number of genes that express in both groups but have significant expression difference. c Enrichment analysis of expression-changed genes in two cultivated groups comparing with OG, and expression-divergent genes (CG1_CG2) into the function roles associated with the bulb traits. dAsa2G02184.1 and Asa4G00255.1 show distinct difference of expression in three garlic groups. e Correlation between the transcript abundance of Asa2G02184.1 and Asa4G00255.1, and the clove number traits in 81 accessions. The number in the top right panes represents the correlation coefficient, and the orange and blue circle indicates the negative and positive correlation, respectively; *** indicates the significance at 0.001 level. The column diagram in the diagonal panes shows the distribution of trait phenotype and expression FPKM value of genes, in which the red line indicates a distribution trend. The scatter plot in the bottom left panes shows the correlation between the transcript abundances and the clove number traits in 81 accessions, where the red line indicates a trend. The orange, green, and blue dots represent the accessions from OG, CG1, and CG2 groups, respectively