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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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Data Analysisin Vegetation Ecology
期刊论文
出版物, 3111, 期号: 0, 页码: 1-297
作者:
Otto Wildi
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浏览/下载：173/2
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提交时间：2017/07/24
Degeneration of foundation cushion species induced by ecological constraints can cause massive changes in alpine plant communities
期刊论文
SCIENCE CHINA-LIFE SCIENCES, 2024, 卷号: 67, 期号: 3, 页码: 596-610
作者:
Chen, Jianguo
;
Chen, Xufang
;
Qian, Lishen
;
Zhang, Yazhou
;
Li, Bo
;
Shi, Honghua
;
Sun, Lu
;
Schob, Christian
;
Sun, Hang
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Adobe PDF(2734Kb)
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浏览/下载：111/28
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提交时间：2024/05/09
alpine ecosystem
biodiversity change
climate change
plant community dynamics
foundation species
global warming
population dynamics
QINGHAI-TIBET PLATEAU
ECOSYSTEM ENGINEERS
HENGDUAN MOUNTAINS
ARENARIA-POLYTRICHOIDES
RANGE SHIFTS
CLIMATE
DIVERSITY
CONSEQUENCES
RECRUITMENT
VEGETATION
Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China
期刊论文
SCIENCE OF THE TOTAL ENVIRONMENT, 2023, 卷号: 868, 页码: 161711
作者:
Yang,Da
;
Wang,Yang-Si-Ding
;
Wang,Qin
;
Ke,Yan
;
Zhang,Yun-Bing
;
Zhang,Shi-Bao
;
Zhang,Yong-Jiang
;
McDowell,Nate G.
;
Zhang,Jiao-Lin
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Adobe PDF(3590Kb)
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浏览/下载：37/6
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提交时间：2024/07/17
Extreme drought
Gas exchange
Hydraulic conductance
Photosynthesis
Physiological response
Valley savannas
LEAF HYDRAULIC CONDUCTANCE
WATER-USE EFFICIENCY
STOMATAL CLOSURE
TROPICAL SAVANNA
CLIMATE-CHANGE
SEGMENTATION
MECHANISMS
STEM
VULNERABILITY
PRODUCTIVITY
Phylogenomic insights into the origin and evolutionary history of evergreen broadleaved forests in East Asia under Cenozoic climate change
期刊论文
MOLECULAR ECOLOGY, 2023, 卷号: 32, 期号: 11, 页码: 2850-2868
作者:
Qin,Sheng-Yuan
;
Zuo,Zheng-Yu
;
Guo,Cen
;
Du,Xin-Yu
;
Liu,Shui-Yin
;
Yu,Xiang-Qin
;
Xiang,Xiao-Guo
;
Rong,Jun
;
Liu,Bing
;
Liu,Zhi-Fang
;
Ma,Peng-Fei
;
Li,De-Zhu
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Adobe PDF(12802Kb)
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浏览/下载：25/10
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提交时间：2024/07/10
East Asian monsoon
evergreen broadleaved forests
genome resequencing
Lauraceae
Litsea complex
single-nucleotide variants
SOUTHERN CHINA EVIDENCE
NORTHERN-HEMISPHERE
MOLECULAR PHYLOGENY
SPECIES RICHNESS
LITSEA COMPLEX
R PACKAGE
LAURACEAE
EOCENE
TERTIARY
BIOGEOGRAPHY
Effects of evolutionary history on assembly of flowering plants in regions across Africa
期刊论文
ECOGRAPHY, 2023, 卷号: 2023, 期号: 9, 页码: e06775
作者:
Qian,Hong
;
Zhang,Jian
;
Jin,Yi
;
Deng,Tao
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浏览/下载：17/11
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提交时间：2024/07/22
angiosperms
coldness
drought
evolutionary legacy
phylogenetic clustering
SPECIES RICHNESS
PHYLOGENETIC STRUCTURE
LATITUDINAL GRADIENT
RANGE-LIMIT
DIVERSITY
DIVERSIFICATION
BIOGEOGRAPHY
PATTERNS
EVAPOTRANSPIRATION
RECONSTRUCTION
Thermal safety margins of plant leaves across biomes under a heatwave
期刊论文
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 806, 页码: 150416
作者:
Kitudom,Nawatbhrist
;
Fauset,Sophie
;
Zhou,Yingying
;
Fan,Zexin
;
Li,Murong
;
He,Mingjian
;
Zhang,Shubin
;
Xu,Kun
;
Lin,Hua
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浏览/下载：96/0
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提交时间：2022/04/02
Photosynthetic heat tolerance
Thermal environment
Heat stress
Thermal stability
Extreme weather
LEAF TEMPERATURES
TREE
TOLERANCE
PHOTOSYNTHESIS
DESERT
PLASTICITY
EVOLUTION
DROUGHT
TRAITS
LIMITS
Monsoon intensification in East Asia triggered the evolution of its flora
期刊论文
FRONTIERS IN PLANT SCIENCE, 2022, 卷号: 13, 页码: 1046538
作者:
Ye, Jun-Wei
;
Tian, Bin
;
Li, De-Zhu
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Adobe PDF(11094Kb)
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浏览/下载：19/8
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提交时间：2024/08/21
east asian monsoon
endemism
late miocene
pleistocene
tertiary relict
SOUTH CHINA SEA
MOLECULAR PHYLOGEOGRAPHY
SUBTROPICAL CHINA
TEMPERATE PLANTS
RELICT PLANTS
HISTORY
INSIGHTS
DIVERSIFICATION
BIODIVERSITY
DIVERSITY
Diversity increases yield but reduces harvest index in crop mixtures
期刊论文
nature plants, 2021
作者:
Jianguo Chen
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浏览/下载：386/115
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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
作者:
Gregory W. Stull
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浏览/下载：393/112
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提交时间：2021/08/23
Effect of climate change on the distribution and phenology of plants,insect pollinators,and their interactions
期刊论文
Biodiversity Science, 2021, 卷号: 29, 期号: 4, 页码: 495-506 1005-0094(2021)29:4<495:QHBHDZ>2.0.TX;2-A
作者:
Shi Yuhan
;
Ren Zongxin
;
Zhao Yanhui
;
Wang Hong
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浏览/下载：179/0
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提交时间：2022/04/02
