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The qRT-PCR method has been widely used to detect gene expression level in plants, helping to understand the molecular mechanisms. However, there are few researches which focus on the selection of the internal reference genes in Forsythia . To select the appropriate reference genes of Forsythia aimed at qRT-PCR normalization, twelve candidate reference genes were selected from our transcriptome data. Their expression was assessed by RT-PCR analysis in 47 Forsythia samples, including 12 species cultivars, different organs and tissues. GeNorm, NormFinder, and BestKeeper software were used to select the appropriate reference genes, AG and PSY were used to verify the accuracy of the outcome. The results showed that UKN1 was a stable reference gene in leaves of twelve Forsythia germplasms and in different developmental stages of fruits. MTP , ABCT  +  MTP , and ABCT  +  MTP  +  TIP were stable reference genes in different organs. ACT and SDH were stable reference genes in different flower tissues and different developmental stages of the flower buds. When Forsythia plants were stressed with PEG or ABA, SDH  +  UKN1  +  G6PD was the stable reference gene group for qRT-PCR. The results provided the basis for investigating the physiological and biochemical processes of Forsythia related to medicinal and ornamental properties, and drought-resistance in the level of gene expression.

Selection and validation of appropriate reference genes for gene expression studies in Forsythia