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Celery is one of the most important vegetable crop and its yield and quality is influenced by many environmental factors. Researches on gene expression not only help to unravel the molecular regulatory mechanism but also identify the key genes in the biological response. RT-qPCR is a commonly used technology to quantify the gene expression. Selecting an appropriate reference gene is an effective approach to improve the accuracy of RT-qPCR assay. To our knowledge, the evaluation of reference genes under different treatments in celery has not been reported yet. In this study, the expression stabilities of eight candidate reference genes ( ACTIN ,  eIF-4 α  ,  GAPDH ,  TBP ,  TUB-A ,  UBC ,  TUB-B , and  EF-1 α  ) under abiotic stresses (heat, cold, drought, and salt) and hormone treatments (SA, MeJA, GA, and ABA) were detected. The expression stabilities of candidate genes were compared and ranked by geNorm, NormFinder, BestKeeper, ΔCt, and RefFinder programs. The results calculated by different programs were not completely consistent. Considering the comprehensive analysis results,  ACTIN  was the most stable reference gene and  TUB-B  showed the worst expression stabilities under the selected abiotic stress and hormone treatments in celery. The reliability of reference genes was further confirmed by the normalization of  CAT1  gene under drought stress. This study presented evidences and basis to select the appropriate reference genes under different treatments in celery.

Selection of appropriate reference genes for RT-qPCR analysis under abiotic stress and hormone treatment in celery