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ABSTRACT: Integrative analysis of metabolite and transcriptome reveals biosynthetic pathway and candidate genes for Eupatilin and Jaceosidin biosynthesis in Artemisia argyi

PROVIDER: PRJNA945494 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23886400_1.fastq.gz	Fastqsanger.gz
	SRR23886400_2.fastq.gz	Fastqsanger.gz
	SRR23886401_1.fastq.gz	Fastqsanger.gz
	SRR23886401_2.fastq.gz	Fastqsanger.gz
	SRR23886402_1.fastq.gz	Fastqsanger.gz

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Project description:Artemisia argyi Lev. et Vant., a common ancient compositae species, is widely utilized in traditional Chinese medicine. The underlying mechanism of terpenoid biosynthesis in leaf has been suggested to play an important role in this medicine. However, the transcriptome of A. argyi has not been established. Here, we performed RNA sequencing in leaf, root and stem tissues to identify all possibly transcribed genes. We assembled a total of 99,807 unigenes by analyzing the expression profiling that were generated from the three tissues. Of them, 67,446 unigenes (67.58%) were annotated from public databases including GO, KEGG, COG. We further performed differential gene expression analysis between leaf with stem and root tissue. Our findings revealed that a total of 7,725 unigenes were specified transcribed in leaf. In particular, we determined multiple genes, which encode significant enzymes including HMGR, MVD, DXS, DXR, HDS and HDR, and transcription factors related to terpenoid synthesis. This study established a valuable resource of transcriptome and identified many transcribed genes related to terpenoid biosynthesis, providing the genomic basis for further studies on the molecular mechanism of the medicine for this species.

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Project description:Purpose: UV-B radiation is a pivotal photomorphogenic signal and positively regulates plant growth and metabolite biosynthesis. In order to elucidate the transcriptional regulation mechanism underlying UV-B-induced artemisinin and flavonoid biosynthesis in Artemisia annua, the transcriptional response of A. annua leaves to UV-B radiation was analyzed using the Illumina transcriptome sequencing. Methods: For UV-B treatment, six-week-old A. annua seedlings growing under normal growth condition were supplemented with extra narrowband UV-B lamps (Philips TL20W/01RS; 1.5 μmol·m-2·s-1)(Yin et al. 2016). The most recently expanded leaf for each A. annua seedling was collected at 0, 2, 4 and 6 hours after exposure to UV-B radiation. Results: A total of 10706 differentially expressed genes including 533 transcription factors, were identified. Based on the expression trends of the differentially expressed factors as well as artemisinin and flavonoid biosynthesis genes, we speculated that transcription factors belonging to 6 clusters were most likely to be involved in the regulation of artemisinin and/or flavonoid biosynthesis. The regulatory relationship between transcription factors and artemisinin/flavonoid biosynthetic genes was further studied. Dual-LUC assays results showed that AaMYB6 is a positive regulator of AaLDOX, which belongs to flavonoid biosynthesis pathway. In addition, we identified a R2R3MYB transcription factor, AaMYB4 which positively mediated both artemisinin and flavonoid biosynthesis pathways by activating the expression of AaADS and AaDBR2 in artemisinin biosynthesis pathway and AaUFGT in flavonoid biosynthesis pathway. Conclusions: our findings provide fundamental knowledge for the further analysis of the parallel transcriptional regulation of artemisinin and flavonoid biosynthesis in A. annua L. under UV-B radiation.

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