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The complete chloroplast genome of Aesculus chinensis var. wilsonii.

ABSTRACT: In this study, we sequenced the complete chloroplast (cp) genome of Aesculus chinensis Bunge var. wilsonii (Rehder) Turland & N. H. Xia and compared it with cp genomes of congeneric species. The cp genome of A. chinensis var. wilsonii is a circular molecule, 156,211 bp in length, with typical quadripartite structure. It has one large single copy (LSC) region of 85,211 bp and one small single copy (SSC) region of 18,124 bp that are separated by two inverted repeat regions (IR) of 26,438 bp. The cp genome encodes 133 genes comprising 85 protein-coding genes, 40 tRNA genes, and eight rRNA ribosomal genes. The overall GC content of the cp genome of A. chinensis var. wilsonii is 37.93%. We conducted amaximum likelihood phylogenetic analysis, which revealed that A. chinensis var. wilsonii is sister to A. wangii and has a close relationship with Acer L. (maples). We expect that the cp genome of A. chinensis var. wilsonii will be useful for DNA barcoding and species delimitation for this species as well as future studies on the conservation, taxonomy, and evolutionary relationships of Aesculus L.

SUBMITTER: Liu Z

PROVIDER: S-EPMC7782131 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Aesculus chinensis var. wilsonii

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Project description:The dried seeds of Aesculus chinensis Bge. var. chekiangensis (Hu et Fang) Fang, called "Suo Luo Zi", have been used in traditional Chinese medicine. Nevertheless, most studies have been focused on components of less polarity fractions. In this research, twelve indoles, including six new indole glycosides (1-6) as well as six known analogs were isolated from the polar portion which has been seldom studied. This is the first description of N-glucosylated indoles obtained from the genus of Aesculus. Structures of the new compounds (1-6) were elucidated based on comprehensive interpretation of HRESIMS, 1D and 2D NMR. Additionally, the neuroprotective activities of the N-glucosylated indoles were evaluated for the first time indicating that compounds 1-5 and 9-10 exhibited moderate neuroprotective activities. Further cytotoxicity tests of isolates 1-10 on three human tumor cell lines suggested that none of these compounds were cytotoxic (IC50 > 50 ?M).

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Bioactive Triterpenoid Saponins From the Seeds of Aesculus chinensis Bge. var. chekiangensis.

Project description:Phytochemical investigation of Aesculus chinensis Bge. var. chekiangensis (Hu et Fang) Fang obtained 33 triterpenoid saponins, including 14 new ones, aesculiside C-P (1-14). The structure elucidations were performed through comprehensive MS, 1D and 2D-NMR analysis, and their absolute configuration was unambiguously determined by X-ray diffraction analysis as well as Mo2(OAc)4-induced ECD method for the first time. All the substances were examined for their cytotoxic activities against three tumor cell lines, Hep G2, HCT-116, and MGC-803. Of these, compounds 8, 9, 14-16, 18, and 22 exhibited potent cytotoxicities against all cell lines with IC50 of 2-21 μM, while compounds 3, 6, 7, 17-19, 20, 24, and 28 depicted moderate activity (IC50 13 to >40 μM). On these bases, the preliminary structure-activity correlations were also discussed. Meanwhile the neuroprotective properties of triterpenoid saponins from Aesculus genus were evaluated for the first time. Among them, compounds 1, 4, 12, 20, 22, 25, 29, and 31 exhibited moderate activities against COCl2-induced PC12 cell injury.

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Project description:Rhamnella wilsonii Schneid 1914 is a member of the Rhamnaceae and endemic to China. In this study, the complete chloroplast genome of R. wilsonii was sequenced and assembled. The complete chloroplast genome was 160,049 bp in length, including a pair of inverted repeats (IRs) of 26,502 bp, one large single copy (LSC) region of 88,274 bp and one small single copy (SSC) region of 18,771 bp. The genome contained 129 genes, including 8 rRNA genes, 37 tRNA genes and 84 protein-coding genes. The overall GC content of the complete chloroplast genome was 37.15%. The phylogenetic analysis demonstrated that R. wilsonii is closely related to R. martinni. This study provides basic information for further studies on the identification and evolution of R. wilsonii and Rhamnella from genomic perspective.

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Phenylethanol glycosides from the seeds of Aesculus chinensis var. chekiangensis.

Project description:Three new phenylethanol glycosides (1-3) and one known analogue (4) were isolated from the seeds of Aesculus chinensis Bge. var. chekiangensis. To the best of our knowledge, this represents the first isolation of phenylethanol glycosides from the genus of Aesculus, which enriched its chemical composition. Structure elucidations were performed via extensive NMR and HRESIMS data together with comparison with literature data. Thereafter, the isolated compounds were assayed for their neuroprotective activities against CoCl2-induced cytotoxicity in PC12 cells and compound 3 exhibited moderate activity.

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The Chromosome-level genome of Aesculus wilsonii provides new insights into terpenoid biosynthesis and Aesculus evolution.

Project description:Aesculus L. (buckeye and horse chestnut) are woody plant species with important horticultural and medicinal values. Aesculus seeds are widely used as biomedicine and cosmetic ingredients due to their saponins. We report a chromosomal-scale genome of Aesculus wilsonii. Sequences amounting to a total of 579.01 Mb were assembled into 20 chromosomes. More than half of the genome (54.46%) were annotated as repetitive sequences, and 46,914 protein-coding genes were predicted. In addition to the widespread gamma event with core eudicots, a unique whole-genome duplication (WGD) event (17.69 Mya) occurred in Aesculus after buckeye differentiated from longan. Due to WGD events and tandem duplications, the related synthetic genes of triterpene saponins unique to Aesculus increased significantly. Combined with transcriptome characterization, the study preliminarily resolved the biosynthetic pathway of triterpenoid saponins like aescin in A. wilsonii genome. Analyses of the resequencing of 104 buckeye accessions revealed clear relationship between the geographic distribution and genetic differentiation of buckeye trees in China. We found that the buckeye species found in southern Shaanxi is A. wilsonii rather than A. chinensis. Population dynamics analysis further suggests that the population size and evolution of existing buckeye species have been influenced by climate fluctuations during the Pleistocene and recent domestication events. The genome of A. wilsonii and population genomics of Aesculus provide a resource for future research on Hippocastanaceae. These findings will contribute to the utilization and diversity protection of Aesculus.

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