Abstract
Quantitative real-time RT-PCR (RT-qPCR) is a technology that can be used to analyze the abundance of gene expression. Reference genes, which are assumed to remain at constant levels in different tissues at various developmental stages and photoperiodic treatments, were selected to analyze the expression levels of flowering time genes and floral development genes. Using digital gene expression technology, nine reference genes with moderate expression in the leaves of Chrysanthemum lavandulifolium at the juvenile phase (CK1) and the squaring stage (W1) were selected as the candidate reference genes for further study. A total of 115 biological samples of C. lavandulifolium were analyzed, including different tissues under various developmental stages and leaves with varied photoperiodic treatments. The stability of the nine reference genes was slightly variable across the samples, but MTP, SKIP16 and PGK were the most stable genes overall. In addition, the relative expression level of ClFT in different tissues of plants with the competence to flower was analyzed to verify the reference genes selected in this study. These studies provide a guide for selecting reference genes for analyzing the expression pattern of flowering time genes and floral development genes in C. lavandulifolium.
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