Abstract
Reference genes are frequently used as a normalization standard to obtain reliable data during quantitative real-time polymerase chain reaction (qRT-PCR). However, recent studies showed that most traditional reference genes were not stable under different treatments or environmental stresses, which may lead to misinterpret expression of the target genes. In this study, 7 candidate reference genes in tea plant (Camellia sinensis (L.) Kuntze cv. Yingshuang) were selected and their expression stability under different abiotic stresses was analyzed using geNorm, NormFinder, and BestKeeper methods. Our results suggest that TUA1 (alpha-1 tubulin) has the most stable expression under damage stresses according to 3 methods of analysis. For drought stresses, 18S rRNA, and GAPDH (glyceraldehyde-3-phosphate dehydrogenase) were the most stable genes. For cold, Al, and NaCl stresses, GAPDH and TUA1 may be the alternative options. Our results may provide an insight for identification of the optimal reference genes for tea plants under various treatments.
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