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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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台湾北部福山地区亚热带雨林种子雨之研究
期刊论文
出版物, 3111, 页码: 1-95
作者:
张杨家豪
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提交时间：2017/07/19
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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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
中国具菌褶牛肝菌类的分类及系统发育研究
学位论文
: 中国科学院大学, 2022
作者:
刘利荣
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浏览/下载：52/0
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提交时间：2024/05/14
小塔氏菌属，桩菇属，褶孔牛肝菌属，新分类单元
Tapinella, Paxillus, Phylloporus, new taxa
重楼属中富含偏诺甾体皂苷的植物资源挖掘及其研究
学位论文
: 中国科学院大学, 2022
作者:
余玲玲
Adobe PDF(11095Kb)
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浏览/下载：174/0
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提交时间：2024/05/14
重楼属 (Paris L.)，黑药花科，偏诺皂苷，球药隔重楼，LC-MS/MS，诱导血小板聚集活性
Paris L., Melanthiaceae, Pennogenin saponins, Paris fargesii, LC-MS/MS, Inducing platelet aggregation activity
白环蘑属白环蘑组真菌及其近缘类群的分类与系统发育
学位论文
: 中国科学院大学, 2022
作者:
马云蕊
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浏览/下载：96/0
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提交时间：2024/05/14
蘑菇科，白环蘑属，分子系统发育，分类，新种
Agaricaceae, Leucoagaricus, Phylogeny, Tanxonomy, New taxa
无柄醉鱼草分类界定与保护生物学研究
学位论文
博士, 2018
作者:
葛佳
Adobe PDF(26688Kb)
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浏览/下载：374/4
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提交时间：2021/01/05
滇西北玉龙雪山三种代表性植物比较景观基因组学研究
学位论文
博士, 2018
作者:
谭少林
Adobe PDF(8426Kb)
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浏览/下载：399/10
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提交时间：2021/01/05
杓兰属和兜兰属植物叶片结构、扩散导度与光合作用
学位论文
硕士, 2018
作者:
杨忠慧
Adobe PDF(3899Kb)
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浏览/下载：204/1
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提交时间：2021/01/05
中国植物学会八十五周年学术年会论文集摘要汇编
会议录
会议录编者:
植物学会
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浏览/下载：370/11
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提交时间：2018/10/24
中国西南山地种子大小变异及与物种分布关系
学位论文
博士, 2018
作者:
陈凯
Adobe PDF(13230Kb)
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浏览/下载：120/8
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提交时间：2021/01/05
