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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
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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
Boletes clarified
期刊论文
出版物, 3111, 期号: 0, 页码: 1-38
作者:
David Arora
;
Jonathan L. Frank
Adobe PDF(1003Kb)
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浏览/下载：249/1
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提交时间：2017/07/24
Appendiculati
Boletaceae
Butter Boletes
Butyriboletus
Molecular phylogenetics
New Genus
New Species
Taxonomy
Stable functional structure despite high taxonomic variability across fungal communities in soils of old-growth montane forests
期刊论文
MICROBIOME, 2023, 卷号: 11, 期号: 1, 页码: 217
作者:
Zeng,Qingchao
;
Lebreton,Annie
;
Auer,Lucas
;
Man,Xiaowu
;
Jia,Liukun
;
Wang,Gengshen
;
Gong,Sai
;
Lombard,Vincent
;
Buee,Marc
;
Wu,Gang
;
Dai,Yucheng
;
Yang,Zhuliang
;
Martin,Francis M.
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Adobe PDF(2245Kb)
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浏览/下载：12/4
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提交时间：2024/05/09
Fungal guilds
Functional traits
Forest soil
Metatranscriptomics
Organic Matter degradation
Yunnan
DATABASE
SPRUCE
Detailed Seed Cone Morpho-Anatomy Provides New Insights into Seed Cone Origin and Evolution of Podocarpaceae; Podocarpoid and Dacrydioid Clades
期刊论文
PLANTS-BASEL, 2023, 卷号: 12, 期号: 22, 页码: 3903
作者:
Khan,Raees
;
Hill,Robert S.
;
Doerken,Veit M.
;
Biffin,Ed
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浏览/下载：4/0
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提交时间：2024/05/09
conifers
developmental biology
dispersal
evolution
fossils
leaf dimorphism
paleobotany
DACRYCARPUS-DACRYDIOIDES
CONIFERS
DISPERSAL
FOREST
PREFERENCES
CUPRESSINUM
BIRDS
Diversity, Distribution, Systematics and Conservation Status of Podocarpaceae
期刊论文
PLANTS-BASEL, 2023, 卷号: 12, 期号: 5, 页码: 1171
作者:
Khan,Raees
;
Hill,Robert S. S.
;
Liu,Jie
;
Biffin,Ed
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Adobe PDF(6773Kb)
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浏览/下载：2/0
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提交时间：2024/05/09
conservation
conifers
climate change
fossils
historical biogeography
IUCN red list
paleo-endemism
physiology
phylogenetics
HYDRAULIC EFFICIENCY
CONIFER DIVERSITY
SEED SIZE
PHYLLOCLADUS
MORPHOLOGY
MACROFOSSILS
EVOLUTION
PLANT
SEDIMENTS
BIOGEOGRAPHY
Gene duplications and phylogenomic conflict underlie major pulses of phenotypic evolution in gymnosperms
期刊论文
nature plants, 2021
作者:
Gregory W. Stull
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浏览/下载：275/93
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提交时间：2021/08/23
Gene duplications and phylogenomic conflict underlie major pulses of phenotypic evolution in gymnosperms
期刊论文
NATURE PLANTS, 2021, 卷号: 7, 期号: 8, 页码: 1015+
作者:
Stull,Gregory W.
;
Qu,Xiao-Jian
;
Parins-Fukuchi,Caroline
;
Yang,Ying-Ying
;
Yang,Jun-Bo
;
Yang,Zhi-Yun
;
Hu,Yi
;
Ma,Hong
;
Soltis,Pamela S.
;
Soltis,Douglas E.
;
Li,De-Zhu
;
Smith,Stephen A.
;
Yi,Ting-Shuang
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浏览/下载：151/71
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提交时间：2022/04/02
SEED PLANTS
R PACKAGE
POLYPLOIDY
CONIFERS
TREE
GENERATION
INFERENCE
ANCIENT
DISCORDANCE
ANGIOSPERMS
Phylogenetic patterns suggest frequent multiple origins of secondary metabolites across the seed-plant 'tree of life'
期刊论文
NATIONAL SCIENCE REVIEW, 2021
作者:
Zhang,Yongzeng
;
Deng,Tao
;
Sun,Lu
;
Landis,Jacob B.
;
Moore,Michael J.
;
Wang,Hengchang
;
Wang,Yuehua
;
Hao,Xiaojiang
;
Chen,Jijun
;
Li,Shenghong
;
Xu,Maonian
;
Puno,Pema-Tenzin
;
Raven,Peter H.
;
Sun,Hang
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浏览/下载：136/21
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提交时间：2023/09/08
Plastome phylogenomics of Cephalotaxus (Cephalotaxaceae) and allied genera
期刊论文
ANNALS OF BOTANY, 2021, 卷号: 127, 期号: 5, 页码: 697-708
作者:
Ji,Yunheng
;
Liu,Changkun
;
Landis,Jacob B.
;
Deng,Min
;
Chen,Jiahui
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浏览/下载：74/17
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提交时间：2022/04/02
Gymnosperm
Cephalotaxaceae
Taxaceae
phylogeny
molecular dating
taxonomic delineation
recent speciation
QUANTITATIVE RECONSTRUCTION
PHYLOGENETIC-RELATIONSHIPS
EVOLUTIONARY HISTORY
MOLECULAR PHYLOGENY
SOUTHWEST CHINA
TAXACEAE
FLORA
CHLOROPLAST
SEQUENCE
CLIMATE
Highly degenerate plastomes in two hemiparasitic dwarf mistletoes: Arceuthobium chinense and A. pini (Viscaceae)
期刊论文
PLANTA, 2021, 卷号: 253, 期号: 6, 页码: 125
作者:
Guo,Xiaorong
;
Zhang,Guangfei
;
Fan,Linyuan
;
Liu,Changkun
;
Ji,Yunheng
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浏览/下载：130/53
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提交时间：2022/04/02
Endophytic habit
Reductive evolution
Rpo genes
rpl33
Gene loss
Santalales
COMPLETE CHLOROPLAST GENOME
PLASTID GENOME
NDH GENES
PHYSIOLOGICAL-ASPECTS
EVOLUTIONARY RATE
DNA BARCODE
LIFE-STYLE
SEQUENCE
ORGANIZATION
LORANTHACEAE
