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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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Plant RD Center[Y65J8322C1]","jscount":"1","jsurl":"/simple-search?field1=all&rpp=10&accurate=false&advanced=false&sort_by=2&isNonaffiliated=false&search_type=-1&query1=Tibetan&order=desc&&fq=dc.project.title_filter%3ADr.%5C+Plant%5C+RD%5C+Center%5C%5BY65J8322C1%5C%5D"},{"jsname":"During a field trip at a brule in Shangri-La, a mixed population of Ligularia Cass. was found, which including L. subspicata (Bur. et Franch.) Hand.-Mazz., L. nelumbifolia (Bur. et Franch.) Hand.-Mazz., L. tongolensis (Franch.) Hand.-Mazz., L. cymbulifera (W.W.Smith) Hand.-Mazz., L. lingiana S.W.Liu, and also some individuals morphologically intermediate between L. subspicata and L. nelumbifolia. Hence, these intermediate individuals were preliminarily assumed as natural hybrids of the two Ligularia. According to their morphology, they’re assumed to form hybrids A and B. Through careful comparison of specimens in herbarium and those we collected, the inflorescence of putative hybrid A is close to L. nelumbifolia, but the shape of laminae are intergradation of L. subspicata and L. nelumbifolia; overall morphology of putative hybrids B is similar to L. nelumbifolia, but inflorescence color is as same as L. subspicata. Compared to L. nelumbifolia (39%) and L. subspicata (36.8%), the germination rate of putative hybrid B (45.7%) slightly higher than the two; but that of hybrid A is extraordinarily low (0.3%). One possible interpretation of the low rate is hybridization. 60 individuals were collected, including putative parents, other 4 species of Ligularia nearby, putative hybrid A and B. They were all direct sequenced of four cpDNA fragments, and direct sequenced or cloning sequenced of nrDNA ITS4-5. The results support that L. nelumbifolia and L. subspicata are parents of putative hybrid A, and the majority female parent is L. subspicata, L. vellerea may also be involved in the hybridization in some degree; the nuclear sequences of putative hybrid B have no superposition, and its chloroplast DNA sequences are identical with L. nelumbifolia, so putative hybrid B could not be hybrid; and there are backcross individuals exist among the putative parent L. subspicata. NewHybrids analysis of ISSR markers indicated that, the individuals of putative hybrid A are almost L. nelumbifolia and L. subspicata F1 hybrid generation (10/11), only 1/11 possibly backcross or other forms; all individuals of hybrid B are L. nelumbifolia; except one individual of L. subspicata as backcrossed, the other parent individuals are 100% reliable. This study focused on molecular evidence, complemented by ecological, reproductive and other characteristics, we demonstrated that the morphologically intermediate individuals’ origin, and the probability of belonging to each parental or hybrid class. And concluded that L. nelumbifolia and L. subspicata are the parents of putative hybrid A, L. vellerea may also be involved in the hybridization in some degree, hybrids mainly are the first generation, a few individuals may be involved in backcross, and most probably backcross with L. subspicata according to the anthesis, while the assumption of hybrid B is not 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The Forest Filter Effect vs. Cold Trapping Effect on the AltitudinalDistribution of PCBs: A Case Study of Mt. Gongga, Eastern Tibetan Plateau
期刊论文
出版物, 3111, 期号: 0, 页码: 1-32
作者:
Xin Liu
;
Jun Li
;
Qian Zheng
;
Haijian Bing
;
Ruijie Zhang
;
Yan Wang
;
Chunling Luo
;
Xiang Liu
;
Yanhong Wu
;
Suhong Pan
;
Gan Zhang
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浏览/下载：182/1
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提交时间：2017/07/24
Distributional responses to climate change of two maple species in southern China
期刊论文
ECOLOGY AND EVOLUTION, 2023, 卷号: 13, 期号: 9, 页码: e10490
作者:
Liu,De Tuan
;
Chen,Jian Ying
;
Sun,Wei Bang
Adobe PDF(4740Kb)
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浏览/下载：2/1
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提交时间：2024/07/10
distribution modelling
global warming
the Hengduan Mountains
the Qinghai-Tibetan Plateau
QINGHAI-TIBETAN PLATEAU
DISTRIBUTION MODELS
ALPINE PLANTS
DIVERSITY
PATTERNS
HISTORY
SHIFTS
Desertification induced changes in soil bacterial and fungal diversity and community structure in a dry-hot valley forest
期刊论文
APPLIED SOIL ECOLOGY, 2023, 卷号: 189, 页码: 104953
作者:
Zhang,Yan
;
Li,Xiuxiu
;
Zhang,Jiangbao
;
Hua,Jiani
;
Li,Jingji
;
Liu,Dong
;
Bhople,Parag
;
Ruan,Honghua
;
Yang,Nan
Adobe PDF(4800Kb)
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浏览/下载：1/1
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提交时间：2024/07/22
Desertification
Soil microbial diversity
soil organic carbon
Forest ecosystem
Climate change
MULTIPLE SEQUENCE ALIGNMENT
ORGANIC-CARBON
NITROGEN
RESPONSES
BIOMASS
DYNAMICS
PH
ECTOMYCORRHIZAL
FERTILIZATION
REVEGETATION
Wildfire associated with a deciduous broadleaved forest from the Neogene Baoshan Basin at the southeastern margin of the Tibetan Plateau
期刊论文
JOURNAL OF PALAEOGEOGRAPHY-ENGLISH, 2023, 卷号: 12, 期号: 3, 页码: 448-462
作者:
Huang,Yong-Jiang
;
Momohara,Arata
;
Li,Shu-Feng
;
Ji,Xue-Ping
;
Qiu,Jian
;
Jia,Lin-Bo
;
Hu,Jin-Jin
;
Ji,Yun-Heng
;
Zhou,Zhe-Kun
Adobe PDF(6113Kb)
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浏览/下载：14/3
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提交时间：2024/07/22
Charcoal
Fossil carpology
Salix
Sambucus
Precipitation seasonality
LATE PLIOCENE
EARLY PLEISTOCENE
FIRE REGIMES
SW CHINA
MONSOONAL CLIMATE
CHARCOAL RECORDS
SOUTHWEST CHINA
FOSSIL WOOD
SP-NOV
VEGETATION
Multiple paternally inherited chloroplast capture events associated with Taxus speciation in the Hengduan Mountains
期刊论文
MOLECULAR PHYLOGENETICS AND EVOLUTION, 2023, 卷号: 189, 页码: 107915
作者:
Qin,Han-Tao
;
Moller,Michael
;
Milne,Richard
;
Luo,Ya-Huang
;
Zhu,Guang-Fu
;
Li,De-Zhu
;
Liu,Jie
;
Gao,Lian-Ming
Adobe PDF(4015Kb)
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浏览/下载：0/0
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提交时间：2024/07/25
Chloroplast capture
Genomic data
Hybridization
Hengduan Mountains
Phylogeny tree discordance
Taxus
POPULATION-SIZE CHANGES
TIBETAN PLATEAU MARGIN
CYTOPLASMIC INHERITANCE
HYBRID SPECIATION
GENETIC DIVERSITY
PINUS-DENSATA
R PACKAGE
TOOL SET
HYBRIDIZATION
BIODIVERSITY
A new species of Helvella Helvellaceae, Pezizomycetes) within the H. macropus group from China
期刊论文
PHYTOTAXA, 2023, 卷号: 601, 期号: 3, 页码: 212-222
作者:
Lu,Jin-Rong
;
Yu,Feng-Ming
;
Lei,Lei
;
Zhang,Ying
;
Zhao,Qi
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浏览/下载：37/6
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提交时间：2024/05/09
1 new taxon
complex group
endemic
saddle fungi
species diversity
SADDLE FUNGI HELVELLA
ASCOMYCOTA
PHYLOGENY
DIVERSITY
PERFORMANCE
PEZIZALES
EVOLUTION
EUROPE
Ancient allopatry and ecological divergence act together to promote plant diversity in mountainous regions: evidence from comparative phylogeography of two genera in the Sino-Himalayan region
期刊论文
BMC PLANT BIOLOGY, 2023, 卷号: 23, 期号: 1, 页码: 572
作者:
Peng,Junchu
;
Ma,Xiangguang
;
Sun,Hang
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浏览/下载：35/5
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提交时间：2024/05/09
Comparative phylogeography
Beesia
Megacodon
Sino-Himalayan
Ecological divergence
Habitat fragmentation
EVOLUTIONARY HISTORY
HENGDUAN MOUNTAINS
POPULATION-STRUCTURE
MOLECULAR PHYLOGENY
TIBETAN PLATEAU
TOOL SET
BIODIVERSITY
UPLIFT
CONSERVATISM
INSIGHTS
A comparison of traditional plant knowledge between Daman people and Tibetans in Gyirong River Valley, Tibet, China
期刊论文
JOURNAL OF ETHNOBIOLOGY AND ETHNOMEDICINE, 2023, 卷号: 19, 期号: 1, 页码: 14
作者:
Guo,Chang-An
;
Ding,Xiaoyong
;
Hu,Huabin
;
Zhang,Yu
;
Bianba,Ciren
;
Bian,Ba
;
Wang,Yuhua
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浏览/下载：34/5
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提交时间：2024/05/09
Himalayas
Ethnobotany
Biodiversity hotspots
Daman people
Traditional knowledge
WILD PLANTS
An ethnobotanical study of wild edible plants used by the Tibetan in the Rongjia River Valley, Tibet, China
期刊论文
JOURNAL OF ETHNOBIOLOGY AND ETHNOMEDICINE, 2023, 卷号: 19, 期号: 1, 页码: 49
作者:
Wang,Jin
;
Ding,Xiaoyong
;
Guo,Chang-An
;
Zhang,Xiong
;
Feng,Haowen
;
Yang,Huizhao
;
Wang,Yuhua
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浏览/下载：44/12
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提交时间：2024/05/09
Tibetan
Wild edible plants
Ethnobotany
Traditional knowledge
Everest region
VEGETABLES
Contrasting range changes of Bergenia (Saxifragaceae) species under future climate change in the Himalaya and Hengduan Mountains Region
期刊论文
THEORETICAL AND APPLIED CLIMATOLOGY, 2023
作者:
Qiu,Li
;
Fu,Qing-Li
;
Jacquemyn,Hans
;
Burgess,Kevin S.
;
Cheng,Jia-Jing
;
Mo,Zhi-Qiong
;
Tang,Xiao-Dong
;
Yang,Bo-Yun
;
Tan,Shao-Lin
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|
Adobe PDF(2858Kb)
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浏览/下载：25/6
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提交时间：2024/05/09
TIBETAN PLATEAU
PLANT DIVERSITY
SHIFTS
DISTRIBUTIONS
ENDEMISM
MODEL
EXTINCTION
ELEVATION
RESPONSES
PATTERN
