Abstract
The inflorescence of Chrysanthemum morifolium cv. ‘Hangju’ has been widely used in China due to its antioxidant and anti-inflammatory properties. The biosynthesis and regulation of flavonoids, a group of bioactive components, in C. morifolium are poorly understood. Transcriptome sequencing is an effective method for obtaining transcript information. Therefore, single-molecule real-time (SMRT) sequencing was performed to obtain the full-length genes involved in flavonoid biosynthesis and regulation in C. morifolium. High-quality RNA was extracted from the inflorescence of C. morifolium at different flowering stages and used to construct two libraries (0–5 kb and 4.5–10 kb) for sequencing. Finally, 125,532 non-redundant isoforms with a mean length of 2009 bp were obtained. Of these, 2,083 transcripts were annotated to pathways related to flavonoid biosynthesis, and 56 isoforms were annotated as CHS, CHI, F3H, F3’H, FNS II, FLS, DFR and ANS genes. Based on gene expression levels at different stages, we predicted the major genes involved in flavonoid biosynthesis. By phylogenetic analysis, we found two candidate MYB transcription factors (CmMYBF1 and CmMYBF2) activating flavonol biosynthesis. Based on the full-length transcriptomic data and further quantitative analysis, the major genes involved in flavonoid biosynthesis and regulation in C. morifolium were predicted in our study. The results provide a valuable theoretical basis for the introduction and cultivation of C. morifolium cv. ‘Hangju’.
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Data availability
The datasets generated and/or analyzed during the current study are not publicly available due to the data was analyzing for another research, but are available from the corresponding author on reasonable request.
Abbreviations
- SMRT-Seq:
-
Single-molecule real-time sequencing
- EBGs:
-
Early biosynthetic genes
- LBGs:
-
Late biosynthetic genes
- SGS:
-
Second-generation sequencing
- TGS:
-
Third-generation sequencing
- ROI:
-
Reads of insert
- NR:
-
Non-redundant protein
- NT:
-
Non-redundant nucleotide
- GO:
-
Gene Ontology
- KOG:
-
Clusters of Eukaryotic Orthologous Groups
- KEGG:
-
Kyoto Encyclopaedia of Genes and Genomes
- ICE:
-
Interative Clustering and Error Correction
- PAL:
-
Phenylalanine ammonia-lyase
- C4H:
-
Cinnamate 4-hydroxylase
- 4CL:
-
4-Coumarate-CoA ligase
- CHS:
-
Chalcone synthase
- CHI:
-
Chalcone isomerase
- F3H:
-
Flavanone 3-hydroxylase
- F3’H:
-
Flavonoid 3’-hydroxylase
- F3’5’H:
-
Flavonoid 3’,5’-hydroxylase
- FNS II:
-
Flavone synthase II
- IFS:
-
Isoflavone synthase
- FLS:
-
Flavonol synthase
- DFR:
-
Dihydroflavonol 4-reductase
- ANS:
-
Anthocyanidin synthase
- ANR:
-
Anthocyanidin reductase
- LAR:
-
Leucoanthocyanidin reductase
- MBW:
-
MYB-bHLH-WD40
- SG:
-
Subgroup
- ORF:
-
Open read frame
- AS:
-
Alternative splicing
- FL:
-
Full length
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Funding
This study was supported by grants from the National Nature Science Foundation of China (No. 81503180) in the design of the study and collection of data. The Fundamental Research Funds for the Central Universities (No. KYZ201608 and KJQN201643) were used in supporting the analysis and interpretation of data and manuscript writing.
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T.W., F.Y., and Q.G. conceived and designed the experiments. T.W. and F.Y. performed the experiments and written the original draft. T.W., F.Y., and Q.Z. analyzed the data and make figures and tables. W.Z. and L.Z. contributed to the cultivation and collection of experimental materials. All authors read and approved the final manuscript.
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10725_2020_660_MOESM5_ESM.pdf
Supplementary Fig. 1 The electrophoretogram of RNA isolated from inflorescence at five different flowering stages (PDF 346.8 kb)
10725_2020_660_MOESM8_ESM.pdf
Supplementary Fig. 4 The phylogenetic tree of MYB factors between C. morifolium and Arabidopsis thaliana. The MYB factors clustered into R2R3-MYB subgroup 4-7 regulating the flavonoid biosynthesis were marked (PDF 930.5 kb)
10725_2020_660_MOESM9_ESM.pdf
Supplementary Fig. 5 The phylogenetic tree of bHLH factors between C. morifolium and Arabidopsis thaliana. The cluster of factors annotated into AtEGL3, AtGL3 and TT8 regulating the anthocyanin and proanthocyanidin biosynthesis was marked (PDF 837.4 kb)
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Wang, T., Yang, F., Guo, Q. et al. Long-read sequencing of Chrysanthemum morifolium transcriptome reveals flavonoid biosynthesis and regulation. Plant Growth Regul 92, 559–569 (2020). https://doi.org/10.1007/s10725-020-00660-x
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DOI: https://doi.org/10.1007/s10725-020-00660-x