Abstract
Fine varieties of the Yunwu Tribute Tea (Camellia Sinensis (L.) Kuntze var. niaowangensis Q. H. Chen) are distributed on the Yunwu Mountain, Guiding County, Guizhou province, China. Cold stress usually occurs in winter and is one of the most significant environmental factors restricting the growth of this plant as well as its geographical distribution. However, only few systematic studies have examined the molecular mechanism of cold tolerance in the Yunwu Tribute Tea. Hence, in this study, Illumina HiSeq technology was applied to investigate the cold-tolerance mechanism and for this purpose, cDNA libraries were obtained from two groups of samples namely, the cold-treated group (DW) and the control group (CK). A total of 185,973 unigenes were produced from 511,987 assembled transcripts and among these, 16,020 differentially expressed genes (DEGs) (corrected p-value <0.01, |log2(fold change)| >3), including 9,606 upregulated and 6,414 downregulated genes, were obtained. Moreover, the antioxidant enzyme system, plant hormone signal transduction, proline metabolism, tyrosine metabolism pathway, and transcription factors were analyzed and based on the results, a series of candidate genes related to cold stress were screened out and discussed. The physiological indexes related to the low temperature response were tested, along with five DEGs which were validated by quantitative real-time PCR. For this study, it is expected that the results of the transcriptome sequence of Yunwu Tribute Tea will provide valuable clues for genetic studies while helping to screen candidate genes for cold-resistance breeding in tea plants.
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