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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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Systematics and Biogeography of Aralia L. (Araliaceae):Revision of Aralia Sects. Aralia, Humiles, Nanae, andSciadodendron
期刊论文
出版物, 3111, 卷号: 57, 期号: 0, 页码: 1-172
作者:
Jun Wen
Adobe PDF(7233Kb)
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浏览/下载：255/6
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提交时间：2017/07/24
Aralia
Aralia Sect. Aralia
Aralia Sect. Dimorphanthus
Aralia Sect. Humiles
Aralia Sect. Nanae
Aralia Sect. pentapanax
Aralia Sect. Sciadodendron
Biogeography
Araliaceae
Systematics
Testing complete plastomes and nuclear ribosomal DNA sequences for species identification in a taxonomically difficult bamboo genus Fargesia
期刊论文
PLANT DIVERSITY, 2023, 卷号: 45, 期号: 2, 页码: 147-155
作者:
Lv,Shi-Yu
;
Ye,Xia-Ying
;
Li,Zhong-Hu
;
Ma,Peng-Fei
;
Li,De-Zhu
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Adobe PDF(2234Kb)
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浏览/下载：20/4
|
提交时间：2024/05/09
Fargesia
Genome-skimming
DNA barcoding
Plastome
Ribosomal DNA
WHOLE CHLOROPLAST GENOMES
RNA-SEQ DATA
ARUNDINARIEAE POACEAE
BAMBUSOIDEAE
TEMPERATE
PLATFORM
The phylogeny and taxonomy of Upretia (Caloplacoideae Teloschistaceae), reveal three new species from Southwestern China
期刊论文
MYCOKEYS, 2023, 期号: 100, 页码: 233-243
作者:
Li,Lijuan
;
Zhang,Yanyun
;
Printzen,Christian
;
Wang,Lisong
;
Wang,Xinyu
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Adobe PDF(5276Kb)
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浏览/下载：19/3
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提交时间：2024/05/09
Chemistry
Hengduan Mountains
lichen
phylogenetic analyses
zeorine type apothecia
LICHEN GENUS CALOPLACA
ENHANCED SPECIFICITY
SIDERITIS GROUP
PERFORMANCE
IDENTIFICATION
NORTH
箭竹属的 DNA 条形码研究
学位论文
: 中国科学院大学, 2022
作者:
吕时雨
Adobe PDF(7121Kb)
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浏览/下载：13/0
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提交时间：2024/05/14
箭竹属， 浅层测序， DNA条形码， 叶绿体基因组， 核糖体DNA
Fargesia, genome-skimming, DNA barcoding, plastome, ribosomal DNA
中国西南山地种子植物多样性演化历史的初步研究
学位论文
: 中国科学院大学, 2022
作者:
杨丹
Adobe PDF(9810Kb)
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浏览/下载：8/0
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提交时间：2024/05/14
生命之树，中国西南山地，演化历史，分化时间估计，多样化速率
Tree of Life, Mountains of Southwest China, Evolutionary History, Divergence Time Estimation, Diversification Rate
滇西北白马雪山地下真菌群落时空分布和形成机制研究
学位论文
: 中国科学院大学, 2022
作者:
龚赛
Adobe PDF(7444Kb)
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浏览/下载：8/0
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提交时间：2024/05/14
地下真菌，中国西南山地，时空格局，群落形成机制，共存网络
Belowground fungi, Mountains of Southwest China, Spatiotemporal pattern, Community assembly process, Coexistence network
Effects of drainage reorganization on phytogeographic pattern in Sino-Himalaya
期刊论文
ALPINE BOTANY, 2022, 卷号: 132, 期号: 1, 页码: 141-151
作者:
Sun,Hang
;
Li,Zhimin
;
Landis,Jacob B.
;
Qian,Lishen
;
Zhang,Ticao
;
Deng,Tao
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Adobe PDF(4617Kb)
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浏览/下载：118/12
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提交时间：2022/04/02
Sino-Himalaya
Paleo Red River
Valley plants
Drainage reorganization
Biogeographic evolution
TERMINALIA-FRANCHETII COMBRETACEAE
MEKONG-SALWEEN DIVIDE
TANAKA-KAIYONG LINE
RIVER-CAPTURE
HENGDUAN MOUNTAINS
GENETIC-STRUCTURE
SOUTHWEST CHINA
CYTOCHROME-B
PHYLOGEOGRAPHY
EVOLUTION
The South Asian monsoon maintains the disjunction of Rumex hastatus between the western Himalayas and the Hengduan Mountains, southwest China
期刊论文
NORDIC JOURNAL OF BOTANY, 2022
作者:
Martine, Eric
;
Zeuss, Dirk
;
Lampei, Christian
;
Sun, Hang
;
Miehe, Georg
;
Opgenoorth, Lars
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Adobe PDF(4103Kb)
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浏览/下载：54/7
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提交时间：2024/03/11
中国西南山地高黎贡山生物物种特有性的演化格局与机制
学位论文
, 2021
作者:
叶俊伟
Adobe PDF(2441Kb)
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浏览/下载：155/0
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提交时间：2024/03/20
横断山区被子植物表皮毛分布格局及其影响机制 研究
学位论文
, 2021
作者:
邬瑞
Adobe PDF(4208Kb)
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浏览/下载：12/0
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提交时间：2024/03/20
