Biomolecules (Jan 2023)

Comparative Transcriptome Analysis of <i>Pueraria lobata</i> Provides Candidate Genes Involved in Puerarin Biosynthesis and Its Regulation

  • Huiting Xi,
  • Yaru Zhu,
  • Wenwen Sun,
  • Nan Tang,
  • Zhengqin Xu,
  • Xiaohong Shang,
  • Yansheng Zhang,
  • Huabing Yan,
  • Changfu Li

DOI
https://doi.org/10.3390/biom13010170
Journal volume & issue
Vol. 13, no. 1
p. 170

Abstract

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Pueraria lobata is a traditional Chinese herb in which an isoflavone C-glucoside, namely puerarin, has received the utmost interest due to its medicinal properties. To date, the biogenesis of puerarin, especially its C-glucosyl reaction in the pathway, remains poorly understood. Moreover, the transcription factors (TFs) that regulate puerarin biosynthesis in P. lobata have not been reported. Here, we performed phytochemical studies on the different developmental stages of the root, stem, and leaf tissues of two P. lobata cultivars, which suggested that both the roots and stems of P. lobata were the sites of puerarin biosynthesis. RNA-sequencing was conducted with the root and stem tissues of the two cultivars under different stages, and the clean reads were mapped to the recently published genome of P. lobata var. thomsonii, yielding the transcriptome dataset. A detailed analysis of the gene expression data, gene coexpression network, and phylogeny proposed several C-GTs that likely participate in puerarin biosynthesis. The first genome-wide analysis of the whole MYB superfamily in P. lobata presented here identified a total of 123 nonredundant PlMYB genes that were significantly expressed in the analyzed tissues. The phylogenetic analysis of PlMYBs with other plant MYB proteins revealed strong PlMYB candidates that may regulate the biosynthesis of isoflavones, such as puerarin.

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