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Melilotus albus is an annual or biennial legume species that adapts to extreme environments via its high stress tolerance. NAC and MYB transcription factors (TFs) are involved in the regulation of lignin biosynthesis, which has not been studied in M. albus . A total of 101 MaNAC and 299 MaMYB members were identified based on M. albus genome. Chromosome distribution and synteny analysis indicated that some genes underwent tandem duplication. Ka/Ks analysis suggested that MaNAC s and MaMYB s underwent strong purifying selection. Stress-, hormone- and development-related cis-elements and MYB-binding sites were identified in the promoter regions of MaNACs and MaMYBs . Five MaNAC s, two MaMYB s and ten lignin biosynthesis genes were identified as presenting coexpression relationships according to weighted gene coexpression network analysis (WGCNA). Eleven and thirteen candidate MaNAC and MaMYB genes related to lignin biosynthesis were identified, respectively, and a network comprising these genes was constructed which further confirmed the MaNAC and MaMYB relationship. These candidate genes had conserved gene structures and motifs and were highly expressed in the stems and roots, and qRT-PCR further verified the expression patterns. Overall, our results provide a reference for determining the precise role of NAC and MYB genes in M. albus and may facilitate efforts to breed low-lignin-content forage cultivars in the future.

NAC and MYB Families and Lignin Biosynthesis-Related Members Identification and Expression Analysis in Melilotus albus