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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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Boletes clarified
期刊论文
出版物, 3111, 期号: 0, 页码: 1-38
Authors:
David Arora
;
Jonathan L. Frank
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Submit date：2017/07/24
Appendiculati
Boletaceae
Butter Boletes
Butyriboletus
Molecular phylogenetics
New Genus
New Species
Taxonomy
Evolutionary ecology of plant-plant interactions
期刊论文
出版物, 3111, 页码: 1-144
Authors:
Zuo Z(作者)
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Submit date：2017/07/19
Data Analysisin Vegetation Ecology
期刊论文
出版物, 3111, 期号: 0, 页码: 1-297
Authors:
Otto Wildi
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Submit date：2017/07/24
Parafuscosporella lignicola sp. nov. (Fuscosporellaceae), from a freshwater habitat in northern Thailand
期刊论文
PHYTOTAXA, 2023, 卷号: 597, 期号: 2, 页码: 141-152
Authors:
Li,Lu
;
Xu,Rong-Ju
;
Luo,Zong-Long
;
Zhao,Qi
;
Cheewangkoon,Ratchadawan
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Submit date：2024/07/16
1 new taxon
Freshwater fungi
Pairwise homoplasy index test
Sordariomycetes
CONIDIAL FUNGI
GENUS
MICROFUNGI
OUTLINE
The Evolution of Mitochondrial Genomes between Two Cymbidium Sister Species: Dozens of Circular Chromosomes and the Maintenance and Deterioration of Genome Synteny
期刊论文
GENES, 2023, 卷号: 14, 期号: 4, 页码: 864
Authors:
Li,Xiaoling
;
Zhe,Mengqing
;
Huang,Yiwei
;
Fan,Weishu
;
Yang,Junbo
;
Zhu,Andan
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Submit date：2024/05/09
mitogenome
multi-chromosomes
genome synteny
recombination
nutritional modes
PLANT MITOCHONDRIAL
ALIGNMENT
SEQUENCE
RATES
MYCOHETEROTROPHY
ORGANIZATION
CHLOROPLAST
FERTILE
FUNGI
梅里雪山植物多样性的垂直梯度格局及群落构建机制
学位论文
: 中国科学院大学, 2022
Authors:
钱栎屾
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Submit date：2024/05/14
物种多样性， 系统发育多样性， 功能多样性， 群落构建， 尺度效应
Species diversity, Phylogenetic diversity, Functional diversity, Community assembly, Scale effect
Phylogeny and morphology reveal a new species of Chlorociboria (Chlorociboriaceae, Leotiomycetes) from southwestern China
期刊论文
PHYTOTAXA, 2022, 卷号: 554, 期号: 2, 页码: 122-134
Authors:
Li, Cui-Jin-Yi
;
Chethana, K. W. Thilini
;
Hyde, Kevin D.
;
Zhao, Qi
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Submit date：2024/07/16
1 new taxon
Helotiales
pairwise homoplasy index test
taxonomic key
FUNGI
HELOTIALES
Morphological trait-matching in plant-Hymenoptera and plant-Diptera mutualisms across an elevational gradient
期刊论文
JOURNAL OF ANIMAL ECOLOGY, 2022, 卷号: 91, 期号: 1, 页码: 196-209
Authors:
Zhao,Yan-Hui
;
Lazaro,Amparo
;
Li,Hai-Dong
;
Tao,Zhi-Bin
;
Liang,Huan
;
Zhou,Wei
;
Ren,Zong-Xin
;
Xu,Kun
;
Li,De-Zhu
;
Wang,Hong
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Submit date：2022/04/02
elevation
nectar tube depth
plant-pollinator interactions
proboscis length
specialisation
trait-matching
Yulong Snow Mountain
ENVIRONMENT RELATIONSHIPS
SPECIES COMPOSITION
BUMBLE BEES
NETWORKS
SPECIALIZATION
FLOWER
ABUNDANCE
POLLINATORS
COMPETITION
PATTERNS
Evolutionary assembly of the Arctic flora
期刊论文
GLOBAL ECOLOGY AND BIOGEOGRAPHY, 2022, 卷号: 31, 期号: 3, 页码: 396-404
Authors:
Qian,Hong
;
Deng,Tao
;
Ricklefs,Robert E.
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Submit date：2022/04/02
cold tolerance
community assembly
environmental filtering
flowering plants
niche conservatism
phylogenetic structure
SPECIES RICHNESS
DIVERSITY
ECOLOGY
ORIGIN
DIVERSIFICATION
CONSERVATISM
BIOGEOGRAPHY
PATTERNS
HISTORY
Comparative Analyses of Chloroplast Genomes From 14 Zanthoxylum Species: Identification of Variable DNA Markers and Phylogenetic Relationships Within the Genus
期刊论文
FRONTIERS IN PLANT SCIENCE, 2021, 卷号: 11, 页码: 605793
Authors:
Zhao,Kaihui
;
Li,Lianqiang
;
Quan,Hong
;
Yang,Junbo
;
Zhang,Zhirong
;
Liao,Zhihua
;
Lan,Xiaozhong
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Submit date：2022/04/02
Zanthoxylum
chloroplast genome
divergent hotspots
DNA barcode sequence
phylogeny
GENETIC DIVERSITY
SSR-MARKERS
SEQUENCE
ANNOTATION
PLATFORM
MATK
LOCI
WILD
PSBA
