A new diarylheptanoid, 3,5-dimethoxy1-17-hydroxyl-4, 11, 19-triketo-[7,0]meta-cyclophane, named as rubanone 1, was isolated from the bark of Myrica rubra along with four known compounds 2-5. Their structures were eluc...A new diarylheptanoid, 3,5-dimethoxy1-17-hydroxyl-4, 11, 19-triketo-[7,0]meta-cyclophane, named as rubanone 1, was isolated from the bark of Myrica rubra along with four known compounds 2-5. Their structures were elucidated by various spectroscopic methods including 2D-NMR techniques or comparison with authentic samples.展开更多
The present study was conducted to assess the molecular characterization and genetic diversity amongst natural populations of Myrica rubra in Guangxi Zhuang Autonomous Region, China, thus to provide scientific evidenc...The present study was conducted to assess the molecular characterization and genetic diversity amongst natural populations of Myrica rubra in Guangxi Zhuang Autonomous Region, China, thus to provide scientific evidence for germplasm conservation and exploitation. Using ISSR （inter-simple sequence repeats） markers, the level of genetic variation and the molecular characterization of 10 natural populations of M. rubra, originated from Guangxi Zhuang Autonomous Region in China, were performed. Based on 11 primers, 123 clear and reproducible DNA fragments were generated, of which 95 （77.24%） were polymorphic. The average value of Nei＇s gene diversity （He） was 0.268. The coefficient of genetic differentiation （Gst） was 0.341, revealing that 34.1% of the total molecular variance existed among populations. The Mantel statistical testing showed that the genetic distance was correlated to the geographic distance, but the correlation was not significant. Ten populations were divided into two big clusters according to unweighted pair group method with arithmetic mean （UPGMA） analysis. One consisted of populations of Rongxian （RX）, Hepu （HP）, Liangqing （LQ）, Marshan （MS）, Lingshan （LS） and Shansi （SS）, which originated from the southern Guangxi, while the other was composed of Guanyang （GY） and Lingui （LG） populations of northern Guangxi, Huanjiang （HJ） populations of northwestern Guangxi and Shanglin （SL） populations of southern Guangxi. The level of genetic variation in wild M. rubra population distributed in Guangxi is high. Gene drift within the population was responsible for genetic variation in wild M. rubra in Guangxi, and the effect of the genetic flow among inter-populations was not significant. Classification of wild M. rubra populations was correlated to climate and environment. The molecular characterization and diversity assessment of M. rubra is of immense value for planning conservation of its genetic resources and their exploitation for further studies.展开更多
选取中国CNKI数据库和国外Web of Science数据库在2012—2021年和2017—2021年2个阶段的文献为研究对象,并对发表的文章数量、作者、国家、机构和关键词等进行统计,通过文献计量学和VOSviewer软件等进行分析,结果可以客观地反映近10年...选取中国CNKI数据库和国外Web of Science数据库在2012—2021年和2017—2021年2个阶段的文献为研究对象,并对发表的文章数量、作者、国家、机构和关键词等进行统计,通过文献计量学和VOSviewer软件等进行分析,结果可以客观地反映近10年来国内外杨梅相关课题的研究动态,为该领域的研究人员提供数据参考。结果表明:近10年来,国内外共发表杨梅相关文章2766篇,发表的文章数量逐年增加;中国是世界杨梅研究的主要出版国,在该方面的研究处于世界领先地位;从发表的论文、作者、机构等内容来看,我国浙江省的研究机构和大学具有较强的研究实力和深厚的学术影响力;就研究内容而言,近年来,国内外杨梅的研究课题主要集中在园艺、化学、医药和工业材料方面。展开更多
文摘A new diarylheptanoid, 3,5-dimethoxy1-17-hydroxyl-4, 11, 19-triketo-[7,0]meta-cyclophane, named as rubanone 1, was isolated from the bark of Myrica rubra along with four known compounds 2-5. Their structures were elucidated by various spectroscopic methods including 2D-NMR techniques or comparison with authentic samples.
基金supported by the National Natural Science Foundation of China (30560007)
文摘The present study was conducted to assess the molecular characterization and genetic diversity amongst natural populations of Myrica rubra in Guangxi Zhuang Autonomous Region, China, thus to provide scientific evidence for germplasm conservation and exploitation. Using ISSR （inter-simple sequence repeats） markers, the level of genetic variation and the molecular characterization of 10 natural populations of M. rubra, originated from Guangxi Zhuang Autonomous Region in China, were performed. Based on 11 primers, 123 clear and reproducible DNA fragments were generated, of which 95 （77.24%） were polymorphic. The average value of Nei＇s gene diversity （He） was 0.268. The coefficient of genetic differentiation （Gst） was 0.341, revealing that 34.1% of the total molecular variance existed among populations. The Mantel statistical testing showed that the genetic distance was correlated to the geographic distance, but the correlation was not significant. Ten populations were divided into two big clusters according to unweighted pair group method with arithmetic mean （UPGMA） analysis. One consisted of populations of Rongxian （RX）, Hepu （HP）, Liangqing （LQ）, Marshan （MS）, Lingshan （LS） and Shansi （SS）, which originated from the southern Guangxi, while the other was composed of Guanyang （GY） and Lingui （LG） populations of northern Guangxi, Huanjiang （HJ） populations of northwestern Guangxi and Shanglin （SL） populations of southern Guangxi. The level of genetic variation in wild M. rubra population distributed in Guangxi is high. Gene drift within the population was responsible for genetic variation in wild M. rubra in Guangxi, and the effect of the genetic flow among inter-populations was not significant. Classification of wild M. rubra populations was correlated to climate and environment. The molecular characterization and diversity assessment of M. rubra is of immense value for planning conservation of its genetic resources and their exploitation for further studies.
文摘选取中国CNKI数据库和国外Web of Science数据库在2012—2021年和2017—2021年2个阶段的文献为研究对象,并对发表的文章数量、作者、国家、机构和关键词等进行统计,通过文献计量学和VOSviewer软件等进行分析,结果可以客观地反映近10年来国内外杨梅相关课题的研究动态,为该领域的研究人员提供数据参考。结果表明:近10年来,国内外共发表杨梅相关文章2766篇,发表的文章数量逐年增加;中国是世界杨梅研究的主要出版国,在该方面的研究处于世界领先地位;从发表的论文、作者、机构等内容来看,我国浙江省的研究机构和大学具有较强的研究实力和深厚的学术影响力;就研究内容而言,近年来,国内外杨梅的研究课题主要集中在园艺、化学、医药和工业材料方面。
