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Han, Xin; He, Bing; Xin, Yue; Xu, Meng; Xu, Li-an
Industrial crops and products, 10/2021, Letnik: 170Journal Article
•Obtain a high-quality Ginkgo seed development-related transcript data set.•Reveals the diversity of TTLs regulation modes in ginkgo seed development.•Further optimized the structure and function annotations of the ginkgo genome. Full-length transcriptome sequencing based on the PacBio sequencing platform could significantly optimize the annotation of gene structures. As an ancient relic gymnosperm in the monotypic order Ginkgoales, Ginkgo biloba L. contains rich terpenoids that are medicinally valuable. The seeds have abundant edible endosperm, which is delicious and of high nutritional value. However, existing molecular studies on the developmental process of ginkgo seeds are relatively weak, and the biosynthesis of terpenoids in seeds has received little attention. Therefore, single-molecule real-time (SMRT) technology and Illumina sequencing were combined to sequence six tissues related to the reproductive growth and development of ginkgo in order to generate a high-quality full-length transcription database. In total, 20.98 Gb of clean reads containing 178,548 full-length non-chimeric (FLNC) sequences were obtained. From these data, 4019 novel genes and 22,845 novel isoforms were predicted, 52.32 % of the novel genes were annotated, and three novel isoforms were annotated in terpene synthesis related pathways. The enrichment analysis of differentially expressed genes (DEGs) showed that, 95 genes were enriched into 21 categories related to seed development, and 47 DEGs were enriched in the skeletal pathway of terpene synthesis. Combined with the real-time quantitative reverse transcription PCR (qRT-PCR), the phosphosynthase family members synthesizing terpene precursors have diverse and complex expression trends during seed development. Our findings confirm the advantages of SMRT, which facilitated the construction a rich transcript data-set for research on the development of ginkgo seeds, enriching the annotation of the ginkgo genome, and enhancing our understanding of gene regulation of terpene biosynthesis in ginkgo seeds.
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