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The radial change (RC) of tree stem is the process of heartwood formation involved in complex molecular mechanism. Chinese fir ( Cunninghamia lanceolata  (Lamb.) Hook.), an evergreen species, is an important fast-growing timber tree in southern China. In this study, the top four stable genes ( IDH ,  UBC2 ,  RCA  and  H2B ) were selected in RC tissues of 15 years old Chinese fir stem (RC15) and the genes ( H2B ,  18S ,  TIP41  and  GAPDH ) were selected in RC tissues of 30 years old Chinese fir stem (RC30). The stability of the reference genes is higher in RC30 than in RC15. Sixty-one  MYB  transcripts were obtained on the PacBio Sequel platform from woody tissues of one 30 years old Chinese fir stem. Based on the number of MYB DNA-binding domain and phylogenetic relationships, the  ClMYB  transcripts contained 21 transcripts of MYB-related proteins (1R-MYB), 39 transcripts of R2R3-MYB proteins (2R-MYB), one transcript of R1R2R3-MYB protein (3R-MYB) belonged to 18 function-annotated clades and two function-unknown clades. In RC woody tissues of 30 years old Chinese fir stem,  ClMYB22  was the transcript with the greatest fold change detected by both RNA-seq and qRT-PCR. Reference genes selected in this study will be helpful for further verification of transcript abundance patterns during the heartwood formation of Chinese fir.

Evaluation of reference genes and characterization of the MYBs in xylem radial change of Chinese fir stem