Fig. 3From: Putative genes in alkaloid biosynthesis identified in Dendrobium officinale by correlating the contents of major bioactive metabolites with genes expression between Protocorm-like bodies and leavesDetermination of the naringenin. Content in D. officinale. a HPLC-UV chromatogram of D. officinale samples and naringenin standard. b Standard curve of naringenin; X-axis represents naringenin content, and Y-axis represents peak area. c Content of naringenin in PLBs and different organs of D. officinale. DW, dried weight of the samples. Different letters associated with bars within the same histogram represent significant differences at p ≤ 0.05 or 0.01Back to article page