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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 < 0.001) and low levels of seed-based gene flow. C. debaoensis (Cycadaceae) is an endangered species restricted to the border of Guangxi and Yunnan province in southwest China. This species has been classified into two types: sand and karst, according to the soil matrix they grow on. We examined chloroplast sequence variation of the cpDNA sequences from 11 populations of this species. Significant population genetic differentiation was detected (GST= 0.684 and FST = 0.74160). There was marked genetic differentiation between populations in the sand and karst regions and no expansion was detected. Climate changes during glacial periods have had significant effects on the current distribution of cycads. The molecular phylogenetic data, together with the geographic distribution of the haplotypes, suggest that C. debaoensis experienced range contraction during glacial periods, and that the current populations are still confined to the original refugia in southwest China which have favorable habitats in glacial period. These results imply that small refugia were maintained in both sand and karst regions during the LGM (last glacial maximum). This species had no postglacial recolonization and only stayed in these refugia up to now. The low within-population diversity of C. debaoensis suggests that there were strong bottleneck events or founder effects within each separate region during the Quaternary climatic oscillations. Relatively high genetic and haplotype diversities were detected in the newly discovered populations, which located at intermediate locality of sand regions and had morphological variation; this is probably the consequence of the admixture of different haplotypes colonizing the area from separate sources. C. micholitzii occurs in the Annan Highlands in central Vietnam near the Laos border. C. bifida occurs in North Vietnam; its distribution extends across the border into adjacent localities in Guangxi and Yunnan in China. For the comparability between them,theywere considered as the same species C. micholitzii by many academicians. The cpDNA sequences from 11 populations showed that these very controversial species, C. micholitzii and C. bifida, is paraphyletic and should belong to the same species C. micholitzii. AMOVA analysis showed that the component of among-population within region/species (76.46%) was unexpectedly larger than the among-species/region component (14.97%), which also indicates that there is no justification for recognizing two species as C. micholitzii and C. bifida. This hypothesis was also supported by the geological data, especially the neotectonic history of the indo-china block, which started to move south since Oligocene and cause the geographic isolation of these two groups. Therefore, the most likely explanation to the phenotypic similarities between these two groups may be the retention of ancestral polymorphisms in the paraphyletic group due to incomplete lineage sorting. Furthermore, the similarities may also be ascribed to pollen-mediated gene flow among geographically proximate populations and/or phenotypic convergence under similar selection schemes in the same region. C.micholitzi had the higest genetic diversity (HT = 0.980,) and genetic differentiation (GST = 0.830, NST = 0.915) among the C. micholitzii complex. The high genetic diversity might be attributed to its long evolutionary history, highly diverse habitats. The ineffective mode of seed dispersal and dramatic neotectonic movement in the distribution range of this species could result in the high genetic differentiation. 2. Phylogeographic analysis based on nuclear ribosomal sequences, We sequenced the nrDNA ITS in all 27 populations sampled, 7 haplotypes were identified, among which C. micholitzii had 6, while C. multipinnata, C. longipetiolula and C. debaoensis shared the remaining one. Compared to chloroplast genes, nuclear genes had higher correlation between genetic and geographical distance, but lower interspecies differentiation (54.42% vs 25.24%). Phylogeographical structure of C. micholitzii and C.bifida based on ITS Variation was consistent with the morphology differentiation. This similar in nuclear gene should be ascribed to pollen-mediated gene flow among geographically proximate populations.Long-distance gene flow over the two groups was clearly interrupted, which brought on the nrDNA genetic differenciation between the geographically isolated groups, to a certain extent affected the morphological variation. 3. Interspecies relationships among Cycas micholitzii complex, We analysed chloroplast sequence variation of the atpB-rbcL and psbA-trnH intergenic spacers in 27 populations sampled of C. micholitzii complex, AMOVA analysis showed that the component of among-species/region component (59.21%). However, phylogenic analysis showed that the haplotypes of C. micholitzii complex couldn`t grouped into four clusters closely corresponding to the narrowly defined C. micholitzi, C. multipinnata, C. debaoensis and C. longipetiolula. We concluded that the conflict may result from several factors: firstly incomplete lineage sorting of C. micholitzii; secondly hybridization/introgression of sympatrically cycads, which would be supported by evidence base on nrDNA ITS sequences; thirdly intramolecular recombination in cpDNA of cycads; eventually the neotectonic movement in the distribution range of this 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The Forest Filter Effect vs. Cold Trapping Effect on the AltitudinalDistribution of PCBs: A Case Study of Mt. Gongga, Eastern Tibetan Plateau
期刊论文
出版物, 3111, 期号: 0, 页码: 1-32
作者:
Xin Liu
;
Jun Li
;
Qian Zheng
;
Haijian Bing
;
Ruijie Zhang
;
Yan Wang
;
Chunling Luo
;
Xiang Liu
;
Yanhong Wu
;
Suhong Pan
;
Gan Zhang
Adobe PDF(998Kb)
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浏览/下载：163/1
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提交时间：2017/07/24
Systema Angiospermarum
期刊论文
出版物, 3111, 页码: 1—21
作者:
Zuo Z(作者)
Adobe PDF(146Kb)
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浏览/下载：233/2
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提交时间：2017/07/19
Ecotourism in Old-growth Forests in Turkey: The Kure Mountains Experience
期刊论文
出版物, 3111, 页码: 281-283
作者:
Zuo Z(作者)
Adobe PDF(84Kb)
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浏览/下载：130/1
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提交时间：2017/07/19
Mitreola quanruii (Loganiaceae), a new species from a karst region in Guangxi, China
期刊论文
PHYTOKEYS, 2023, 期号: 232, 页码: 67-75
作者:
Hu,Renchuan
;
Liao,Xiaowen
;
Luo,Binsheng
;
Liu,Cheng
;
Nong,You
;
Wu,Lei
Adobe PDF(2791Kb)
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浏览/下载：1/1
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提交时间：2024/05/09
China
Loganiaceae
Mitreola
new taxon
taxonomy
YUNNAN
Historical development of karst evergreen broadleaved forests in East Asia has shaped the evolution of a hemiparasitic genus Brandisia (Orobanchaceae)
期刊论文
PLANT DIVERSITY, 2023, 卷号: 45, 期号: 5, 页码: 501-512
作者:
Chen,Zhe
;
Zhou,Zhuo
;
Guo,Ze-Min
;
Van Do,Truong
;
Sun,Hang
;
Niu,Yang
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浏览/下载：9/3
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提交时间：2024/05/09
Biogeography
Brandisia
Evergreen broadleaved forests (EBLFs)
Karst
Orobanchaceae
Phylogeny
PLANT-POLLINATOR INTERACTIONS
SOUTH CHINA
PHYLOGENY
DIVERSIFICATION
VEGETATION
DISINTEGRATION
RECONSTRUCTION
CONSEQUENCES
BIODIVERSITY
BIOGEOGRAPHY
广义红豆杉科系统发育基因组学与生物地理学研究
学位论文
: 中国科学院大学, 2022
作者:
汪洁
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浏览/下载：1/0
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提交时间：2024/05/14
广义红豆杉科，叶绿体基因组，二代条形码，系统发育基因组学，生物地理
Taxaceae s.l., Plastomes, Super-barcoding, Phylogenomics, Biogeography
Response strategies of woody seedlings to shading and watering over time after topsoil translocation in dry-hot karst region of China
期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2022, 卷号: 519, 页码: 120319
作者:
Zhao, Gaojuan
;
Chen, Fajun
;
Yuan, Chuang
;
Yang, Jingya
;
Shen, Youxin
;
Zhang, Shiyu
;
Yang, Jianbo
;
Ayemele, Aurele Gnetegha
;
Li, Xiong
;
Xu, Jianchu
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浏览/下载：45/7
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提交时间：2024/03/11
养分和寄主选择在珍稀资源树种蒜头果育苗中的探索应用
学位论文
, 2021
作者:
李悦
Adobe PDF(6459Kb)
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浏览/下载：94/0
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提交时间：2024/03/20
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：70/2
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提交时间：2023/11/02
Protect China's karst cave habitats
期刊论文
SCIENCE, 2021, 卷号: 374, 期号: 6568, 页码: 698-698
作者:
Duan,Yi-Fan
;
Li,Meng
;
Xu,Ke-Wang
;
Zhang,Liang
;
Zhang,Li-Bing
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浏览/下载：51/0
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提交时间：2022/04/02
GESNERIACEAE
GUIZHOU
