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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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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
喜马拉雅地区核桃的遗传多样性与遗传结构
学位论文
: 中国科学院大学, 2022
作者:
Magige Ephie Awino
Adobe PDF(6107Kb)
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浏览/下载：6/0
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提交时间：2024/05/14
云南梧桐(Firmiana major)的变色花传粉功能特征及遗传结构研究
学位论文
: 中国科学院大学, 2022
作者:
马雨倩
Adobe PDF(5297Kb)
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浏览/下载：15/0
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提交时间：2024/05/14
云南梧桐，极小种群野生植物，遗传结构，花色变化，传粉特征
Firmiana major
Plant Species with Extremely Small Populations
Genetic structure
Floral color change
Pollination characteristics
极小种群野生植物显脉木兰的保护遗传学研究
学位论文
: 中国科学院大学, 2022
作者:
杨丰懋
Adobe PDF(2114Kb)
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浏览/下载：12/0
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提交时间：2024/05/14
保护遗传学，简化基因组，种群历史动态，极小种群野生植物，显脉木兰
Conservation genetics, RAD-seq, Demographic history, Plant Species with Extremely Small Populations, Magnolia fistulosa
高山流石滩两种伪装紫堇的表型变异与群体遗传结构
学位论文
: 中国科学院大学, 2022
作者:
郭泽敏
Adobe PDF(5492Kb)
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浏览/下载：4/0
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提交时间：2024/05/14
伪装植物
Plant camouflage
表型多样性
Phenotypic diversity
多态性
Polymorphism
自然选择
Natural selection
高山冰缘带
Alpine subnival zone
钟花报春的种群遗传结构和繁殖性状分化
学位论文
: 中国科学院大学, 2022
作者:
贺雨婷
Adobe PDF(3780Kb)
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浏览/下载：11/0
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提交时间：2024/05/14
微卫星标记，遗传结构，种群动态历史，繁殖性状，QST-FST
SSR, Population structure, Population demographic history, Reproductive traits, QST-FST
保护生物学的技术方法在极度濒危植物紫花杜鹃中的应用
学位论文
: 中国科学院大学, 2022
作者:
敖艺山
Adobe PDF(2193Kb)
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浏览/下载：13/0
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提交时间：2024/05/14
ddRAD-seq、遗传多样性、群体遗传学、保护策略
ddRAD-seq、Genetic Diversity、Population genetics、Conservation Strategy
卷鞘鸢尾参考转录组的组装方法评估及应用
学位论文
: 中国科学院大学, 2022
作者:
朱张士昌
Adobe PDF(17595Kb)
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浏览/下载：14/0
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提交时间：2024/05/14
非模式生物,转录组测序,种质资源,鸢尾属,群体遗传
Non-Model Organism,RNA-Seq,Germplasm Resource,Iris,Population Genetics
系统发育在生物多样性保护中的应用-以高黎贡山北段为例
学位论文
, 2021
作者:
岳娟
Adobe PDF(2238Kb)
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浏览/下载：87/2
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提交时间：2023/11/02
互对醉鱼草的自然杂交起源与历史变迁研究
学位论文
, 2020
作者:
廖荣丽
Adobe PDF(7439Kb)
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浏览/下载：139/0
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提交时间：2023/11/02
