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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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李德铢 [50]
税玉民 [34]
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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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Science Foundation, GAR[P506/14/13541S]","jscount":"1","jsurl":"/simple-search?field1=all&rpp=10&accurate=false&advanced=false&sort_by=2&isNonaffiliated=false&search_type=-1&query1=GUANGXI&order=desc&&fq=dc.project.title_filter%3ACzech%5C+Science%5C+Foundation%2C%5C+GAR%5C%5BP506%5C%2F14%5C%2F13541S%5C%5D"},{"jsname":"lastIndexed","jscount":"2023-05-25"}],"Funding Project","dc.project.title_filter")'>
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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
Authors:
Jun Wen
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Submit date：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
Complete chloroplast genome sequence of an endangered plant Oreocharis cotinifolia (Gesneriaceae) from Guangxi, China
期刊论文
MITOCHONDRIAL DNA PART B-RESOURCES, 2021, 卷号: 6, 期号: 10, 页码: 2936-2938
Authors:
Tang,Jinli
;
Zhao,Bo
;
Li,Cailin
;
Hong,Xin
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Submit date：2022/04/02
Chloroplast genome Endangered
Oreocharis cotinifolia (Gesneriaceae)
Phylogeny
Spiradiclis yuanyangensis (Rubiaceae), a new species from Yunnan, China
期刊论文
PHYTOTAXA, 2021, 卷号: 522, 期号: 4, 页码: 294-300
Authors:
Wu,Lei
;
Liu,Cheng
;
Song,Xiao-Fei
;
Chen,You-Sheng
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Submit date：2022/04/02
limestone
new species
Rubiaceae
Spiradiclis
Yuanyang
SP-NOV RUBIACEAE
LIMESTONE AREAS
PHYLOGENY
GUANGXI
Molecular and morphological evidence for a new species of Leptopus (Phyllanthaceae) from Southeast Yunnan, China
期刊论文
PEERJ, 2021, 卷号: 9, 页码: e11989
Authors:
Zhang,Wenhua
;
Zhu,Xinxin
;
Xue,Bine
;
Liu,Ende
;
Li,Yuling
;
Yao,Gang
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Leptopus
Phyllanthaceae
Poranthereae
Taxonomy
Yunnan
China
TRIBE PORANTHEREAE PHYLLANTHACEAE
EUPHORBIACEAE
MALIPOENSIS
PHYLOGENETICS
Impatiens wutaishanensis (Balsaminaceae), a new species from Southeast Yunnan, China
期刊论文
PHYTOKEYS, 2021, 期号: 176, 页码: 43-53
Authors:
Liao,Rong-Li
;
Cai,Lei
;
Yu,Zhi-Yong
;
Wang,Yue-Hua
;
Sun,Wei-Bang
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China
Flora of Yunnan
Impatiens parvisepala
Impatiens wutaishanensis
morphology
GUANGXI
Begonia catbensis (sect. Coelocentrum, Begoniaceae), a new species from northern Vietnam
期刊论文
PHYTOKEYS, 2021, 期号: 179, 页码: 1-12
Authors:
Dong,Li-Na
;
Nguyen,Khang Sinh
;
Shui,Yu-Min
;
Hieu Quang Nguyen
;
Xu,Wei-Bin
;
Nguyen,Xuan Khu
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Begonia
Cat Ba
endangered plant
new species
Vietnam
LIMESTONE AREAS
GUANGXI
Saxifraga viridiflora (Saxifragaceae), an unusual new species from Guangxi, China
期刊论文
PHYTOKEYS, 2021, 期号: 184, 页码: 19-26
Authors:
Zhang,Xin-Jian
;
Fu,Quan-Sheng
;
Chen,Jun-Tong
;
Li,Li-Juan
;
Luo,Peng-Rui
;
Peng,Jing-Yi
;
Huang,Xian-Han
;
Sun,Hang
;
Deng,Tao
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China
Guangxi
new species
Saxifragaceae
taxonomy
MOLECULAR PHYLOGENETICS
HUNAN PROVINCE
SYSTEMATICS
MORPHOLOGY
EVOLUTION
Estimating the Potential Impacts of Climate Change on the Spatial Distribution of Garuga forrestii, an Endemic Species in China
期刊论文
FORESTS, 2021, 卷号: 12, 期号: 12, 页码: 1708
Authors:
Tiamiyu,Bashir B.
;
Ngarega,Boniface K.
;
Zhang,Xu
;
Zhang,Huajie
;
Kuang,Tianhui
;
Huang,Gui-Yun
;
Deng,Tao
;
Wang,Hengchang
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Submit date：2022/04/02
biodiversity conservation
climate change
MaxEnt
habitat suitability
RCP scenarios
ECOLOGICAL NICHE MODELS
SAMPLING BIAS
RANGE
BIODIVERSITY
COMPLEXITY
SELECTION
ACCURACY
MAXENT
Diospyros xylocarpa, a New Species of Ebenaceae from China and Vietnam
期刊论文
PHYTOTAXA, 2021, 卷号: 528, 期号: 2, 页码: 133-138
Authors:
Sima,Yong-Kang
;
Chen,Wen-Hong
;
Wu,Jian-Yong
;
Shui,Yu-Min
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China
Diospyros xylocarpa
Ebenaceae
Vietnam
LIMESTONE AREAS
GUANGXI
A global plastid phylogeny of the fern genus Asplenium (Aspleniaceae)
期刊论文
CLADISTICS, 2020
Authors:
Xu, Ke-Wang
;
Zhang, Liang
;
Rothfels, Carl J.
;
Smith, Alan R.
;
Viane, Ronald
;
Lorence, David
;
Wood, Kenneth R.
;
Chen, Cheng-Wei
;
Knapp, Ralf
;
Zhou, Lin
;
Ngan Thi Lu
;
Zhou, Xin-Mao
;
Wei, Hong-Jin
;
Fan, Qiang
;
Chen, Su-Fang
;
Cicuzza, Daniele
;
Gao, Xin-Fen
;
Liao, Wen-Bo
;
Zhang, Li-Bing
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Submit date：2021/01/05
