Abstract
The Chinese narcissus is a well-known monocotyledon plant with a beautiful color, and fresh with a sweet floral scent. Lack of transcriptomic and genomic information hinders understanding of the molecular mechanisms underlying the biosynthesis of narcissus floral scent volatiles. Here we predicted the functions of identified significantly differentially expressed genes (DEGs), according to public protein annotation databases. Using RNA-sequencing (RNA-Seq) on the Illumina HiSeq system and de novo transcriptome assembly, we investigated gene expression in narcissus corona and petal tissues at the early flowering (day 1) and full-bloom (day 7) stages. Significant differences in the expression profiles of 14 fragrance-related genes were further analyzed by qRT-PCR. A total of 62,826,860,514 bases were generated by RNA-seq; clean reads were 210,658,254 bp, and the guanine-cytosine content was 47.7%–48.88%. Transcripts (n = 167,374; 67.27%) and unigenes (n = 81,442; 32.73%) had mean lengths of 1069.70 bp and 813.27 bp, respectively. The total length and N50 length values of transcripts were 179,040,048 bp and 1654 bp, while those of unigenes were 66,234,291 bp and 1406 bp. Assembled genes were annotated by comparison with the non-redundant, Protein family, Clusters of Orthologous Groups of proteins, Swiss-Prot, Kyoto Encyclopedia of Genes and Genomes, and Gene Ontology, public protein databases. Additionally, 46 and 71 significantly differentially expressed genes encoded enzymes and transcription factors, respectively, associated with floral volatiles biosynthesis pathways, were analyzed in-depth. Our findings represent a fundamental step toward better understanding of the mechanisms of narcissus floral volatile biosynthesis.
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Abbreviations
- HS-SPME:
-
solid-phase microextraction
- GC-MS:
-
gas chromatography/mass spectrometry
- NES/LINS:
-
nerolidol/linalool synthase
- TPS:
-
terpene synthase
- AADC:
-
pyridoxal-50 -phosphate-dependent L-aromatic amino acid decarboxylase
- PAR:
-
phenylacetaldehyde reductase
- DXR:
-
1-deoxy-d-xylulose 5-phosphate reductoisomerase
- PAL:
-
phenylalanine ammonia-lyase
- BEAT:
-
benzyl alcohol acetyltransferase
- BAMT:
-
benzoic acid carboxyl methyl transferase
- SAMT:
-
salicylic acid carboxyl methyl- transferase
- HPL:
-
Hydroperoxide lyase
- 2AP:
-
2-acetyl-1-pyrroline
- BADH2 (AMADH2):
-
betaine aldehyde dehydrogenase 2
- NR:
-
non-redundant protein sequences
- Pfam:
-
Protein family
- KOG/COG/eggnog:
-
Clusters of Orthologous Groups of proteins
- Swiss-Prot:
-
a manually annotated and reviewed protein sequence database
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- GO:
-
Gene Ontology
- DEGs:
-
differential expressed genes
- IPP:
-
isopentenyl diphosphate
- DMAPP (DMADP):
-
dimethylallyl diphosphate
- G3P:
-
glyceraldehyde 3-phosphate
- MEP:
-
2-C-methyl-D-erythritol 4-phosphate
- DXS:
-
1-D-desoxyxylulose 5-phosphate synthase
- DXP:
-
1-deoxy-d-xylulose 5-phosphate
- TPP:
-
thiamine pyrophosphate
- CMS:
-
2-C-methyl-D-erythritol 4- phosphate cytidylyltransferase
- CTP:
-
cytosine 5′-triphosphate
- ICME:
-
isoprenylcysteine methylesterase
- GGDP:
-
geranylgeranyl diphosphate
- Dedol-PP:
-
dehydrodolichyl diphosphate
- DDS:
-
dedol-PP synthase
- ABA:
-
abscisic acid
- GA:
-
gibberellin
- CDP-ME2P:
-
4-diphosphocytidyl-2-C-methyl-D-erythritol 2-phosphate
- ME-CPP:
-
2-C-methyl-D-erythritol 2,4-cyclodiphosphate
- MEcDP:
-
2- C-methyl-D-erythritol 2,4-cyclodiphosphate
- HMBPP:
-
1-hydroxy-2-methyl-butenyl 4-disphosphate
- FDP:
-
(E, E)-Famesyl-PP
- GDP:
-
Geranyl-PP
- DoI-PP:
-
Dolichol-PP
- MAS:
-
momilactone A synthase
- benzoyl-CoA:
-
O-benzoyltransferase
- DBAT:
-
10-deacetylbaccatin III 10-O-acetyltransferase
- Phe:
-
phenylalanine
- Tyr:
-
tyrosine
- TAL:
-
tyrosine ammonia lyase
- 4CL:
-
4-coumarate--CoA ligase
- ALDH:
-
aldehyde dehydrogenase
- CCR:
-
cinnamoyl CoA reductase
- CCoAOMT:
-
caffeoyl-CoA-O-methyltransferase
- CAD:
-
cinnamyl alcohol dehydrogenase
- ASAT:
-
aspartate aminotransferase
- HCT:
-
shikimate O-hydroxycinnamoyl transferase;
- benzoyl-CoA:
-
benzyl alcohol O-benzoyltransferase
- bZIP:
-
basic leucine zipper
- ERF:
-
ethylene-responsive factor
- bHLH:
-
basic helix-loop-helix
- SRF:
-
serum response factor
- TCP:
-
TEOSINTE-BRANCHED1/CYCLOIDEA/PCF
- EOBI:
-
EMISSION OF BENZENOIDS I
- MAPK:
-
mitogen-activated protein kinase
- JA:
-
jasmonate acid
- BIS1:
-
bHLH iridoid synthesis 1
- qRT-PCR:
-
real-time quantitative PCR
- FPKM:
-
fragments per kilobase of transcript per million mapped reads
- FDR:
-
false discovery rate
- TFs:
-
transcription factors
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Acknowledgments
We would like to thank the Charlesworth (https://www.cwauthors.com.cn) for language editing services.
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This work was supported by the Natural Science Foundation of China (NSFC; 30972031) and the Science and Technology Innovation Team of Fujian Academy of Agricultural Sciences (STIT2017-2-11).
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HYS and XM drafted the manuscript together. HYS conceived the study and participated in the design of all experiments. XM performed qRT-PCR and statistical analysis. CXJ participated in the data analysis and discussion about the experiments. All authors read and approved the final manuscript.
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He, Y., Xu, M. & Chen, X. De Novo Transcriptomics Analysis of the Floral Scent of Chinese Narcissus. Tropical Plant Biol. 13, 172–188 (2020). https://doi.org/10.1007/s12042-020-09253-4
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DOI: https://doi.org/10.1007/s12042-020-09253-4