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Complete plastome sequence of Eustoma grandiflorum (Gentianaceae), a popular cut flower.

ABSTRACT: Eustoma grandiflorum (Raf.) Shinners is a popular cut flower due to its beautiful morphological characteristics and extended vase life. Here, the complete plastome sequence of E. grandiflorum was reported based on the Illumina HiSeq Platform. The plastome sequence is 154,230 bp in length with a typical quadripartite structure, containing a pair of inverted repeated (IR) regions (25,755 bp) that are separated by a large single copy (LSC) region of 84,297 bp, and a small single copy (SSC) region of 18,423 bp. A total of 130 functional genes were annotated, including 84 protein-coding genes, 38 tRNA genes, and 8 rRNA genes. The complete plastome sequence of E. grandiflorum will provide a valuable resource for its garden utilization and the phylogenetic studies of Gentianaceae.

SUBMITTER: Yan J

PROVIDER: S-EPMC7706805 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Chromosome-scale genome assembly of Eustoma grandiflorum, the first complete genome sequence in the genus Eustoma.

Project description:Eustoma grandiflorum (Raf.) Shinn. is an annual herbaceous plant native to the southern United States, Mexico, and the Greater Antilles. It has a large flower with a variety of colors and is an important flower crop. In this study, we established a chromosome-scale de novo assembly of E. grandiflorum genome sequences by integrating four genomic and genetic approaches: (1) Pacific Biosciences (PacBio) Sequel deep sequencing, (2) error correction of the assembly by Illumina short reads, (3) scaffolding by chromatin conformation capture sequencing (Hi-C), and (4) genetic linkage maps derived from an F2 mapping population. Thirty-six pseudomolecules and 64 unplaced scaffolds were created, with a total length of 1,324.8 Mb. A total of 36,619 genes were predicted on the genome as high-confidence genes. A comparison of genome structure between E. grandiflorum and C. canephora or O. pumila suggested whole-genome duplication after the divergence between the families Gentianaceae and Rubiaceae. Phylogenetic analysis with single-copy genes suggested that the divergence time between Gentianaceae and Rubiaceae was 74.94 MYA. Genetic diversity analysis was performed for nine commercial E. grandiflorum varieties bred in Japan, from which 254,205 variants were identified. This first report on the construction of a reference genome sequence in the genus Eustoma is expected to contribute to genetic and genomic studies in this genus and in the family Gentianaceae.

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Additional betalain accumulation by genetic engineering leads to a novel flower color in lisianthus (<i>Eustoma grandiflorum</i>).

Project description:Betalains, comprising violet betacyanins and yellow betaxanthins, are pigments found in plants belonging to the order Caryophyllales. In this study, we induced the accumulation of betalains in ornamental lisianthus (Eustoma grandiflorum) by genetic engineering. Three betalain biosynthetic genes encoding CYP76AD1, dihydroxyphenylalanine (DOPA) 4,5-dioxygenase (DOD), and cyclo-DOPA 5-O-glucosyltransferase (5GT) were expressed under the control of the cauliflower mosaic virus (CaMV) 35S promoter in lisianthus, in which anthocyanin pigments are responsible for the pink flower color. During the selection process on hygromycin-containing media, some shoots with red leaves were obtained. However, most red-colored shoots were suppressed root induction and incapable of further growth. Only clone #1 successfully acclimatized and bloomed, producing pinkish-red flowers, with a slightly greater intensity of red color than that in wild-type flowers. T1 plants derived from clone #1 segregated into five typical flower color phenotypes: wine red, bright pink, pale pink, pale yellow, and salmon pink. Among these, line #1-1 showed high expression levels of all three transgenes and exhibited a novel wine-red flower color. In the flower petals of line #1-1, abundant betacyanins and low-level betaxanthins were coexistent with anthocyanins. In other lines, differences in the relative accumulation of betalain and anthocyanin pigments resulted in flower color variations, as described above. Thus, this study is the first to successfully produce novel flower color varieties in ornamental plants by controlling betalain accumulation through genetic engineering.

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Complete chloroplast genome of <i>Exacum affine</i> (Gentianaceae): the first plastome of the tribe Exaceae in the family Gentianaceae.

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