- The relative gene expression levels of these SmABCs in different organs/tissues of S. miltiorrhiza were represented by color scales from red to yellow and from yellow to blue, indicating the order of gene expression levels from high to low. The organs/tissues used to detect gene expression levels include flowers (F), stems (S), leaves (L), roots (R), pericytes (Pe), phloem (Ph), and xylem (Xy). M0 represents the control leaves treated with MeJA for 0 h, and M12 represents the leaves treated with MeJA (200 μM) for 12 h. All expression data were derived from transcriptome data in our previous studies [23, 24]. NBD: nucleotide binding domain, TMD: transmembrane domain. The superscript “*” of the sequence length of SmABCs indicates that the length of the ABC proteins are shorter than theirs homologous gene of Arabidopsis at least 100 amino acids
