1 Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, Hunan Province 410221, China; 2 Key laboratory of Genetic Breeding and Microbial Processing for Bast Fiber Crops, MARA, Changsha, Hunan Province 410221, China; 3 Yuelushan Laboratory, Changsha, Hunan Province 410128, China
Glutathione S-transferases (GSTs) play an important role in the regulation of plants against stressful environments, but the systematic studies on Ramie were lack. In this paper, a total of 43 BnGSTs gene families were identified by bioinformatic analyses, most of which were predicted to be located in the cytoplasm and belonged to the plant-specific Tau and Phi class. Inter-species covariance analysis revealed that BnGSTs genes represented more orthologous genes in dicots than monocots; intra-species covariance analysis revealed that there were five pairs of paralogous genes among BnGSTs, all of which were derived from the whole genome or fragmentary gene duplication, and all of them were found that Ka/Ks ratios were less than 1, indicating that they were subjected to purifying selection. Cis-acting element prediction revealed that the upstream of these BnGSTs genes was rich in light-responsive, phytohormone-regulated and stress-responsive elements combined with transcriptome expression data, nine tissue-specific candidate genes were screened with significant (P<0.05) changes on expression patterns in roots, stems and leaves under cadmium stress. Two genes, BnGST22 and BnGST12, were identified as having significant up-regulation and high relative expression, which could be used as target genes for further functional verification. This study further enriched the functional gene pool of ramie and provided a theoretical basis for the use of anti-stress resources and variety selection.
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