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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 < 0.05) were exhibited by this species. The SAMOVA revealed seven diverging groups of related chlorotypes, six of them had distinct nonoverlapping geographical ranges: one in the northeast comprising 10 populations, a second with a southeast distribution comprising 22 populations, and the remaning four groups comprising 15 populations located in the west part of the species’ range along different river valleys. The genetic clustering of populations into three regions was also supported by analysis of molecular variance, which showed that most genetic variation (82.43%) was found among these three regions. Two clusters were distinguished by both phylogenetic analysis and genealogical analysis of chlorotypes, one consisting of chlorotypes from the western region and the second consisting of those from the eastern region. Significant genetic differences between the two regions might be attributed to vicariance and restricted gene flow, and this vicariance could be explained by the physical environmental heterogeneity on each side of the Tanaka-Kaiyong Line. Following the uplift of the Tibetan Plateau, the reorganization of the major river drainages was primarily caused by river separation and capture events. These historical events could change the distribution of S. davidii from fragmented to continuous (Upper/Lower Jinshajiang and Yalongjiang/Daduhe), and from continuous to fragmented (Nujiang and Jinshajiang/Honghe). However, spatial and temporal patterns of phylogeographic divergence are strongly associated with historical disjunction rather than modern drainage connections. Moreover, the following north-south split in the eastern region and effective isolation with their genetic diversity were essentially modelled by genetic drift. The higher chlorotype richness and genetic divergence for populations in western region compared with other two regions suggests that there were multipe refugia or in situ survival of S. davidii in the Himalayan-Hengduan Mountain region. Fixation of chlorotypes in the northeastern region and near fixation in the southeastern region suggest a recent colonization of these areas. We further found that this species underwent past range expansion around 37-303 thousand years ago (kya). The southeastern populations likely experienced a demographic expansion via unidirectional gene flow along rivers, while northeastern populations underwent a more northward expansion, both from initial populations (s) (21, 22, 23) preserved on eastern refugia (Jinshajiang). This process might have been accompanied with a series of founder effects or bottlenecks making populations genetically impoverished. 3. Phylogeographic analysisbased on nuclear sequence，We sequenced the nuclear (ncpGS) region in all populations sampled, recovering 23 nuclear haplotypes. Compared to cpDNA, both NST (0.470) and GST (0.338) were relatively lower, but NST was also significantly larger than GST. 37.10% of the total variation was distributed among regions which was much lower than that shown by chlorotypes. Thus, more extensive distribution of nuclear haplotypes was exhibited across the geographical range instead of the strong population subdivision observed in chlorotypes. Similarly to the chloroplast data, we found that genetic differentiation of nDNA was positively correlated with the geographical distance, but the increase in the geographical distance between populations did not increase the genetic differentiation of nDNA as rapidly as that of cpDNA. These contrasting levels between the chloroplast and nuclear genomes of S. davidii are likely due to limited gene flow of cpDNA by seeds vs. the extensive gene flow of nDNA by wind-mediated pollen in the population history. We also determined from nuclear markers that haplotype diversity was reduced in the southeastern and northeastern regions due to the loss of rare haplotypes in western region. This reduction of gene diversity is also a signature of founder events or recent bottleneck during post-glacial colonization. However, nuclear diversity within populations remains high. This provides evidence that regionally pollen flow might be sufficiently high to blur the genetic identity of founder populations over a reasonably large spatial scale.3. Relationships among three varieties，The phylogenetic analysis identified two phylogroups of chlorotypes, corresponding to S. davidii var. davidii and var. chuansinesis. The former was distinguished by the abscence of predonminant nuclear haplotype H1 of the latter. The monophyletic group of chlorotypes in var. davidii and var. liangshanesis showed their relatively close relationship. And their genetic divergence from the third variety appears to be relative to their slight morphological difference in leaf size and the divergent environmental niche spaces they occupy. Thus, the observed differences in morphological characters between var. chuansinesis and other two varieties can be explained by the seed dispersal limitation illustrated above (as inferred by geographical separation) and by environmental heterogeneity (as inferred by precipitation or elevation) or by a combination of both. After all, the geological changes, drainage reorganization, and floristic differences following the Himalayan uplift have been suggested to affect the genetic structure of S. davidii. These results provide new insights into the phylogeographic pattern of plants in China. In addition, the unique population genetic structure found in S. davidii has provided important insights into the evolutionary history of this species. The genetic profile uncovered in this study is also critical for its conservation management. Our study has uncovered the existence of at least two ‘evolutionary significant units’ independent units within S. davidii, corresponding to var. davidii from eastern region and var. chuansinensis from western region. The conservation efforts should first focus on most western populations and on the southeastern ones exhibiting high levels of genetic diversity, while the genetically homogeneous northeastern populations located in the degraded Loess Plateau should require much greater conservation 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期刊影响因子升序
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台湾北部福山地区亚热带雨林种子雨之研究
期刊论文
出版物, 3111, 页码: 1-95
作者:
张杨家豪
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提交时间：2017/07/19
Saxifraga cataphracta (Saxifragaceae), a new species from Southwest China
期刊论文
NORDIC JOURNAL OF BOTANY, 2023, 卷号: 2023, 期号: 7
作者:
Zhang,Xin-Jian
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Zhang,Cheng
;
Kuai,Xin-Yuan
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Chen,Jun-Tong
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Deng,Tao
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Sun,Hang
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浏览/下载：181/47
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提交时间：2024/07/10
DNA sequences
morphology
Saxifraga sect
Irregulares
taxonomy
HUNAN PROVINCE
INFERENCE
MRBAYES
CHOICE
A re-examination of the circumscription of Saxifraga mengtzeana (Saxifragaceae)
期刊论文
ECOLOGY AND EVOLUTION, 2023, 卷号: 13, 期号: 3, 页码: e9886
作者:
Zhang,Xin-Jian
;
Gornall,Richard J.
;
Zhang,Zhuo-Xin
;
Chen,Jun-Tong
;
Sun,Hang
;
Deng,Tao
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提交时间：2024/07/10
China
morphology
phylogeny
Saxifragaceae
taxonomy
HUNAN PROVINCE
INFERENCE
MRBAYES
CHOICE
Saxifraga sunhangiana (Saxifragaceae), a new species from Gansu, China
期刊论文
TAIWANIA, 2022, 卷号: 67, 期号: 2, 页码: 195-200
作者:
Zhang, Xin-Jian
;
Kuang, Tian-hui
;
Chen, Jun-Tong
;
LI, Li-Juan
;
Peng, Jing-Yi
;
Guan, Kailang
;
Huang, Xian-Han
;
Wang, Heng-Chang
;
Deng, Tao
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浏览/下载：236/54
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提交时间：2024/03/11
Grade of Membership models reveal geographical and environmental correlates of floristic structure in a temperate biodiversity hotspot
期刊论文
NEW PHYTOLOGIST, 2021, 卷号: 232, 期号: 3, 页码: 1424-1435
作者:
Li,Qin
;
Sun,Hang
;
Boufford,David E.
;
Bartholomew,Bruce
;
Fritsch,Peter W.
;
Chen,Jiahui
;
Deng,Tao
;
Ree,Richard H.
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提交时间：2022/04/02
biogeographical regionalization
biotic turnover
floristic structure
Hengduan Mountains
seed plants
species motif
tropical-temperate divide
HENGDUAN MOUNTAINS
BIOGEOGRAPHICAL REGIONS
TIBETAN PLATEAU
PLANT DIVERSITY
PATTERNS
WORLDS
DIVERSIFICATION
EVOLUTION
GRADIENT
CLIMATE
Alpine community recruitment potential is determined by habitat attributes in the alpine ecosystems of the Himalaya-Hengduan Mountains, SW China
期刊论文
ECOLOGY AND EVOLUTION, 2021, 卷号: 11, 期号: 23, 页码: 17397-17408
作者:
Chen,Xufang
;
Qian,Lishen
;
Zhang,Yazhou
;
Shi,Honghua
;
Sun,Hang
;
Chen,Jianguo
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提交时间：2022/04/02
alpine ecosystem
community recruitment
habitat type
Himalaya-Hengduan Mountain
seed bank
species diversity
SOIL SEED BANK
MICROSITE LIMITATION
GLACIER FORELAND
PLANT COMMUNITY
CUSHION PLANTS
CLIMATE-CHANGE
SPECIES-POOL
DISPERSAL
DESERT
STRATEGIES
The positive effects of the alpine cushion plant Arenaria polytrichoides on insect dynamics are determined by both physical and biotic factors
期刊论文
SCIENCE OF THE TOTAL ENVIRONMENT, 2021, 卷号: 762, 页码: 143091
作者:
Chen,Jianguo
;
Zhang,Yazhou
;
Zhang,Hongrui
;
Schoeb,Christian
;
Wang,Songwei
;
Chang,Shuai
;
Sun,Hang
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Adobe PDF(813Kb)
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提交时间：2022/04/02
Alpine ecosystem
Climate change
Cushion species
Environmental gradient
Insect diversity
Microclimatic refugia
SPECIES-RICHNESS
FACILITATION
COMMUNITIES
DIVERSITY
ELEVATION
ALTITUDE
VEGETATION
INCREASE
BEETLE
SHIFTS
Saxifraga viridiflora (Saxifragaceae), an unusual new species from Guangxi, China
期刊论文
PHYTOKEYS, 2021, 期号: 184, 页码: 19-26
作者:
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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提交时间：2022/04/02
China
Guangxi
new species
Saxifragaceae
taxonomy
MOLECULAR PHYLOGENETICS
HUNAN PROVINCE
SYSTEMATICS
MORPHOLOGY
EVOLUTION
互对醉鱼草的自然杂交起源与历史变迁研究
学位论文
, 2020
作者:
廖荣丽
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浏览/下载：301/0
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提交时间：2023/11/02
青藏高原植物功能性状和物种丰富度梯度格局研究
学位论文
, 2020
作者:
孙露
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浏览/下载：265/1
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提交时间：2023/11/02
