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- 저자 : Faxin Yu (검색결과 3 건)
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Tengfei Shen,Faxin Yu,Meng Xu,Yongda Zhong 강원대학교 산림과학연구소 2022 강원대학교 산림과학연구소 학술대회 Vol.2022 No.10
Cinnamomum camphora is widely distributed in southeastern of China and is a representative species of Laurales, which has important ecological and economic values due to its richness in plant secondary metabolites. In this study, the chromosome-level reference genome of C. camphora was published with a genome size of 670.29 Mb, of which contig N50 was 2.41 Mb and scaffold N50 was 60.19 Mb, and the duplicated sequences accounted for about half of the genome. Comparative genomic analysis showed that C. camphora underwent three whole-genome duplication (WGD) events, with the distant WGD event being an ε-replication event shared by angiosperm ancestors; the intermediate WGD event occurring before the divergence of Laurales and Magnoliales (Liriodendron chinense); and the recent event occurring approximately before the divergence within Laurales. In addition, we examined the expression of terpene synthesis-related genes in seven different tissues and found that DXS, DXR and HDR, the key limiting enzymes of the MEP pathway associated with monoterpene synthesis, were highly expressed in flowers. In addition, a total of 83 CcamTPS genes were predicted and annotated in the camphor tree genome, and most of them were highly expressed in leaves, stem tips and bark. The chromosomal-level reference genome of the C. camphora provides new insights into the special evolutionary status of magnoliids and terpene biosynthesis.
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Xiao Zufei,Jin Zhinong,Zhang Beihong,Li Feng,Yu Faxin,Zhang Haiyan,Lü Xiongwei,Zhang Jie 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.4
Cinnamomum bodinieri is a useful plant that could be improved by increasing its cultivation rate. To explore the optimal concentration of exogenously applied IBA for root formation and development in the C. bodinieri citral type, micro-shoots and the fresh tissues of their bases were subjected to morphological and transcriptome analyses, respectively. When plantedQuery on a rooting medium (1/2 MS) with 1.5 mg/L IBA for 25 days, the rooting rates and root numbers were significantly higher than those obtained with 0, 0.5, 1.0, or 2.0 mg/L IBA treatment. Transcriptome analyses conducted 0 day, 7 days, 11 days, and 14 days after planting in the optimal rooting medium demonstrated that the IBA modified the plant’s carbohydrate metabolism and auxin signaling pathway. The root-specific expressions of TIR1, GH3, and SAUR were up-expressed while AUX/IAA was repressed, which contributed to the formation of lateral root initiation sites and root cell elongation. At the same time, d-glucose synthesis increased and the accumulation of starch decreased as more carbohydrates were used to form and develop roots instead of being used for the rapid cell division required for shoot growth. This study identified the optimal rooting medium for the C. bodinieri citral type and determined the molecular mechanisms involved in the regulation of exogenously applied IBA during root formation and development at the transcriptional level.
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Yongda Zhong,Zhiting Li,Shujuan Liu,Aihong Yang,Lipan Liu,Yanqiang Li,Meng Xu,Faxin Yu 강원대학교 산림과학연구소 2018 강원대학교 산림과학연구소 학술대회 Vol.2018 No.09
Cinnamomum camphora (Lauraceae) is an evergreen broad-leaved tree and distributed in the south of China and Japan. This species has been widely cultivated in many countries because of its aromatic oils, insect-repellent effects and ornamental value. Despite its vast utilization and cultivation, little is known about its genetic diversity and population genetics. To date, only a few genomic simple sequence repeat (SSR) markers were developed in C. camphora and no genic-SSR primers were available yet. Thus, it is necessary to develop more genic-SSR markers, which will facilitate the genetic studies of Cinanamomum. In this study, a total of 74,289 simple sequence repeats (SSRs) were found in 56,124 unigenes, of which 14,225 unigenes contained more than one SSR locus. Among these SSR loci, the mono-nucleotide repeats were the most frequent, with a frequency of 61.14%, followed by 24.87% di-nucleotide repeats and 12.87% tri-nucleotide repeats. Twenty-one polymorphic SSR markers were developed and validated in 45 camphor trees. The 21 loci were further examined for genetic diversity of 38 provenances, 190 individuals in the whole natural distribution area of camphor tree in China. The results showed that 74 polymorphic sites were detected with average 2.74 polymorphic were detected for each prime. The means of observed and expected heterozygosities were 0.4446 and 0.4419, respectively. Nei's and Shannon’s information index for these populations were 0.4400 and 0.7193, respectively. The genetic similarity coefficient of 38 provenances was between 0.05 and 0.95, with an average of 0.17.The smallest genetic distance is JXWY and JXRJ and the genetic distance between JXTG and GZDZ was the largest. Cluster analysis in 0.88 genetic distance can divide into five groups. Jiangxi provenances clustered into two groups, of which JXAY grouped into one group and other provenances grouped into another group. Other provenances of China grouped three small branches: CQYY and HNHH, GZDZ and SCLZ, and other provenances. The clustering results showed that the genetic components of camphor tree in China had obvious regional features. The analysis of molecular variance exhibited that 77% of genetic variation was observed within the populations. The novel genic-SSR markers will not only benefit genetic diversity analysis and wild resources conservation of C. camphora, but also contribute to exploring the further evolutionary history and genetic differentiation pattern of Cinnamomum.
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