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中国科学院昆明植物研究所知识管理系统
Knowledge Management System of Kunming Institute of Botany,CAS
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GST, P < 0.05) were exhibited by this species. The SAMOVA revealed seven diverging groups of related chlorotypes, six of them had distinct nonoverlapping geographical ranges: one in the northeast comprising 10 populations, a second with a southeast distribution comprising 22 populations, and the remaning four groups comprising 15 populations located in the west part of the species’ range along different river valleys. The genetic clustering of populations into three regions was also supported by analysis of molecular variance, which showed that most genetic variation (82.43%) was found among these three regions. Two clusters were distinguished by both phylogenetic analysis and genealogical analysis of chlorotypes, one consisting of chlorotypes from the western region and the second consisting of those from the eastern region. Significant genetic differences between the two regions might be attributed to vicariance and restricted gene flow, and this vicariance could be explained by the physical environmental heterogeneity on each side of the Tanaka-Kaiyong Line. Following the uplift of the Tibetan Plateau, the reorganization of the major river drainages was primarily caused by river separation and capture events. These historical events could change the distribution of S. davidii from fragmented to continuous (Upper/Lower Jinshajiang and Yalongjiang/Daduhe), and from continuous to fragmented (Nujiang and Jinshajiang/Honghe). However, spatial and temporal patterns of phylogeographic divergence are strongly associated with historical disjunction rather than modern drainage connections. Moreover, the following north-south split in the eastern region and effective isolation with their genetic diversity were essentially modelled by genetic drift. The higher chlorotype richness and genetic divergence for populations in western region compared with other two regions suggests that there were multipe refugia or in situ survival of S. davidii in the Himalayan-Hengduan Mountain region. Fixation of chlorotypes in the northeastern region and near fixation in the southeastern region suggest a recent colonization of these areas. We further found that this species underwent past range expansion around 37-303 thousand years ago (kya). The southeastern populations likely experienced a demographic expansion via unidirectional gene flow along rivers, while northeastern populations underwent a more northward expansion, both from initial populations (s) (21, 22, 23) preserved on eastern refugia (Jinshajiang). This process might have been accompanied with a series of founder effects or bottlenecks making populations genetically impoverished. 3. Phylogeographic analysisbased on nuclear sequence，We sequenced the nuclear (ncpGS) region in all populations sampled, recovering 23 nuclear haplotypes. Compared to cpDNA, both NST (0.470) and GST (0.338) were relatively lower, but NST was also significantly larger than GST. 37.10% of the total variation was distributed among regions which was much lower than that shown by chlorotypes. Thus, more extensive distribution of nuclear haplotypes was exhibited across the geographical range instead of the strong population subdivision observed in chlorotypes. Similarly to the chloroplast data, we found that genetic differentiation of nDNA was positively correlated with the geographical distance, but the increase in the geographical distance between populations did not increase the genetic differentiation of nDNA as rapidly as that of cpDNA. These contrasting levels between the chloroplast and nuclear genomes of S. davidii are likely due to limited gene flow of cpDNA by seeds vs. the extensive gene flow of nDNA by wind-mediated pollen in the population history. We also determined from nuclear markers that haplotype diversity was reduced in the southeastern and northeastern regions due to the loss of rare haplotypes in western region. This reduction of gene diversity is also a signature of founder events or recent bottleneck during post-glacial colonization. However, nuclear diversity within populations remains high. This provides evidence that regionally pollen flow might be sufficiently high to blur the genetic identity of founder populations over a reasonably large spatial scale.3. Relationships among three varieties，The phylogenetic analysis identified two phylogroups of chlorotypes, corresponding to S. davidii var. davidii and var. chuansinesis. The former was distinguished by the abscence of predonminant nuclear haplotype H1 of the latter. The monophyletic group of chlorotypes in var. davidii and var. liangshanesis showed their relatively close relationship. And their genetic divergence from the third variety appears to be relative to their slight morphological difference in leaf size and the divergent environmental niche spaces they occupy. Thus, the observed differences in morphological characters between var. chuansinesis and other two varieties can be explained by the seed dispersal limitation illustrated above (as inferred by geographical separation) and by environmental heterogeneity (as inferred by precipitation or elevation) or by a combination of both. After all, the geological changes, drainage reorganization, and floristic differences following the Himalayan uplift have been suggested to affect the genetic structure of S. davidii. These results provide new insights into the phylogeographic pattern of plants in China. In addition, the unique population genetic structure found in S. davidii has provided important insights into the evolutionary history of this species. The genetic profile uncovered in this study is also critical for its conservation management. Our study has uncovered the existence of at least two ‘evolutionary significant units’ independent units within S. davidii, corresponding to var. davidii from eastern region and var. chuansinensis from western region. The conservation efforts should first focus on most western populations and on the southeastern ones exhibiting high levels of genetic diversity, while the genetically homogeneous northeastern populations located in the degraded Loess Plateau should require much greater conservation 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保存国家战略生物资源的科学思考与举措
期刊论文
出版物, 3111, 页码: 1—6
作者:
段子渊
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黄宏文
;
刘杰
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周桔
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提交时间：2017/07/19
报春花属植物交配系统转变研究
学位论文
: 中国科学院大学, 2022
作者:
钟莉
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提交时间：2024/05/14
报春花属，交配系统，二型花柱，同型花柱，自交综合征，遗传多样性，性状演化
Primula, mating system, distyly, homostyly, genetic diversity, selfing syndrome, trait evolution
口蘑属的系统学及我国该属的物种多样性研究
学位论文
: 中国科学院大学, 2022
作者:
崔杨洋
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浏览/下载：869/3
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提交时间：2024/05/14
口蘑，共衍征，系统，物种多样性，菌褶变色
Tricholoma, synapomorphy, system, species diversity, the discoloration of the lamellae
唇形科叶绿体系统发育基因组学研究 ——兼论假野芝麻属的系统学位置
学位论文
: 中国科学院大学, 2022
作者:
赵飞
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浏览/下载：729/3
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提交时间：2024/05/14
唇形科，野芝麻亚科，假野芝麻属，族间关系，系统发育基因组学
Lamiaceae, Lamioideae, Paralamium, tribe relationships, phylogenomic
中国杯伞科的系统发育与分类研究
学位论文
: 中国科学院大学, 2022
作者:
何正蜜
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浏览/下载：272/1
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提交时间：2024/05/14
广义杯伞，杯伞科，金钱菌属，单拷贝同源直系基因，毒蕈碱
Clitocybe s.l., Clitocybaceae, Collybia, single-copy gene, muscarine
世界紫堇属（罂粟科）的分子系统学与生物地理学研究
学位论文
: 中国科学院大学, 2022
作者:
陈俊通
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浏览/下载：155/2
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提交时间：2024/05/14
紫堇亚科，紫堇属，系统发育，生物地理，组级新分类系统
Fumarioideae, Corydalis, Phylogeny, Biogeography, New classification
中国罂粟科紫堇属南黄堇组的分类学研究
学位论文
: 中国科学院大学, 2022
作者:
肖金妃
Adobe PDF(31486Kb)
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浏览/下载：137/1
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提交时间：2024/05/14
分类修订，分子系统学，紫堇属，南黄堇组，罂粟科
Taxonomic revision, Molecular phylogenetics, Corydalis, Corydalis sect. Davidianae, Papaveraceae
中国雪花衣属及其近缘属黑川衣属的分类和系统发育研究
学位论文
: 中国科学院大学, 2022
作者:
王禄汀
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浏览/下载：143/1
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提交时间：2024/05/14
雪花衣属，经典分类，系统发育学，新种
Anaptychia, Classical Taxonomy, Phylogeny, New Species
云南薹草属（Carex）分类修订及植物地理学研究
学位论文
: 中国科学院大学, 2022
作者:
李园园
Adobe PDF(46538Kb)
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浏览/下载：147/1
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提交时间：2024/05/14
薹草属，嵩草属，形态学研究，分类修订，植物区系
Carex, Kobresia, Morphological Study, Taxonomic Revision, Flora
叶绿体全基因组序列在香薷属（唇 形科）系统发育中的应用
学位论文
: 中国科学院大学, 2022
作者:
孙增朋
Adobe PDF(18540Kb)
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浏览/下载：170/1
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提交时间：2024/05/14
香薷属
Elsholtzia
叶绿体基因组
Plastomes
系统发育重建
Phylogenetic reconstruction
生物地理学
Biogeography
高变区
Highly variable region
