Herbaceous peony ( Paeonia lactiflora
Pall.) is an excellent material for studying the formation of flower colour because of its abundant colour. The full-length cDNA of a UDP-glucose: Flavonoid 5-O-glucosyltransferase gene (UF5GT
) containing 1629 bp nucleotides was obtained from P. lactiflora
. The expression patterns of nine related anthocyanin biosynthetic genes (PlPSY
) in diurnal variation petals showed that their expression peaks were basically at 15:00 and the expression patterns were consistent with the trend of sampling conditions except individual gene. And the highest expression levels were in PlCHS
, which could be the candidates to regulate P. lactiflora
flower colour by means of genetic engineering.