Chloroplast phylogeography of <i>Dipentodon</i> (Dipentodontaceae) in southwest China and northern Vietnam

Yuan, Qingjun; Zhang, Zhiyong; Peng, Hua; Ge, Song

doi:10.1111/j.1365-294x.2007.03628.x

Cited by 88 publications

(77 citation statements)

References 51 publications

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“…These geologic/geographic barriers may have limited the expansion of the species and may have played an important role in forming a rough ''Tanaka Line'' (Tanaka 1954, Fig. 1) (a boundary between the SinoJapanese plate/biogeographic region in the east and the Sino-Himalayan plate/biogeographic region in the west, approximately corresponding to a straight line starting at 28°N, 98°E and progressing southward to approximately 18°45 0 or 19°N, 108°E) distribution pattern for M. cathcartii; a distribution pattern that also occurs for many other Sino-Himalayan taxa (e.g., Caryota urens Linn, Taiwania cryptomerioides Hayata, Dipentodon sinicus Dunn and Tacca chantrieri André) in Yunnan Province (Li and Li 1992;Zhang et al 2006a;Yuan et al 2008). …”

Section: Levels Of Genetic Variation Within and Among Populationsmentioning

confidence: 95%

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

et al. 2009

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Nine natural populations of the rare evergreen tree Magnolia cathcartii (Magnoliaceae) were sampled across its natural range, and amplified fragment length polymorphism (AFLP) markers were used to assess genetic variation within and among populations. Three ex situ populations were also surveyed to determine whether conservation plantings include the entire genetic diversity of the species. Genetic diversity within the natural populations was very low (0.122 for Nei's gene diversity), and the southeast populations had the highest diversity. The ex situ populations had a lower diversity than the mean diversity for all populations, and none of the ex situ populations reached the levels of diversity found in their source populations. Genetic differentiation was high among natural populations (G st = 0.247), and an isolation-by-distance pattern was detected. Habitat fragmentation, restricted gene flow, and geitonogamy are proposed to be the primary reasons for the low genetic diversity and high genetic differentiation. More protection is needed, especially for the southeast populations, which possess the highest numbers of unique alleles according to AFLP fragment analyses. The ex situ program was a good first step towards preserving this species, but the current ex situ populations preserve only a limited portion of its genetic diversity. Future ex situ efforts should focus on enhancing the plantings with individuals from southeastern Yunnan.

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Section: Levels Of Genetic Variation Within and Among Populationsmentioning

confidence: 95%

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

et al. 2009

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“…This region harbours about 12,000 species of vascular plants, of which at least 20 genera and 3,500 species are endemic (Myers et al 2000;Wang and Zhang 1994;Wilson 1992;Wu 1988;Ying et al 1993). Previous studies of plant phylogeography in this region have focused mainly on taxa from the plateau areas of the Qinghai-Tibetan Plateau and adjacent mountain ranges (e.g., the Hengduan Mountains) (Yuan et al 2008;Zhang et al 2007aZhang et al , 2005. However, from a phylogeographic perspective, far less attention has been devoted to the endemic flora of the valleys of the region, e.g.…”

Section: Introductionmentioning

confidence: 98%

Phylogeographic structure of Terminalia franchetii (Combretaceae) in southwest China and its implications for drainage geological history

Zhang

Sun

2010

J Plant Res

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Following the rapid uplift of the Qinghai-Tibetan Plateau, the reorganization of the major river drainages in southwest China was primarily caused by river capture events. However, the impact of these past changes in drainage patterns on the current distribution and genetic structure of the endemic flora of this region remains largely unknown. Here we report a survey of amplified fragment length polymorphism (AFLP) in Terminalia franchetii, an endemic shrub or small tree of the deep and dry-hot river valleys of this region. We surveyed AFLP variation within and among 21 populations (251 individuals) of T. franchetii, distributed disjunctively between northern and southern drainage systems. Using STRUCTURE, principal coordinates analysis, and genetic distance methods, we identified two main population genetic groups (I and II) and four subgroups within the species, as follows: (I) the Upper Jinshajiang Valley (subgroup I((north))) and the Honghe drainage area (subgroup I((south))); (II) the Middle and Lower Jinshajiang and Yalongjiang Valleys (subgroup II((north))) and the Nanpanjiang drainage area (subgroup II((south))). Genetic diversity was lower in group I than in group II. According to the genetic diversity and genetic structure results, we suggest that the modern disjunctive distribution and associated patterns of genetic structure of T. franchetii result from vicariance caused by several historical drainage capture events, involving the separation of the Upper Jinshajiang, Yalongjiang and Daduhe from the Honghe or Nanpanjiang in southwest China.

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“…Each individual island may have acted as a microfuge during glaciation. A majority of phylogeographic research in this region have demonstrated that the unique topography promoted strong population structure, independent refugial isolation and locally endemic speciation (Liu et al 2009;Wang et al 2008;Yuan et al 2008). In the cases of our results, significant phylogeographic structures were inferred from cpDNA in P. tunicoides and P. secundiflora, as one conclusion, the region probably provided sheltering for these species.…”

Section: Population Genetic Structurementioning

confidence: 96%

Diversity and conservation of plant species in dry valleys, southwest China

Zhao

Gong

2015

Biodivers Conserv

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The dry valleys in southwest China harbor a highly varied concentration of endemic plant species. To date, the conservation of the unique ecosystem has been paid attention, whereas conservation for the regional endemic plant species has not been much focused. The dry valleys own approximately 1707 plant species among which, 37.42 % are endemic. The plant species in that dry ecosystem are currently challenged by the climate change and anthropogenic activity. To give insight into the current (and past) status of threatened species and the population conservation management strategies, we investigated the genetic diversities of endemic and endangered plant species in the dry valleys in the last decade, using nuclear or plastid molecular markers. Our data revealed that the plant species in this region have low levels of genetic diversity within populations and strong genetic structure. We thus concluded that strong geography patterns are mainly shaped by complex topography as well as their local habitats. We pointed that it is of importance to incorporate neutral and non-neutral genetic diversity when assessing the status of the endangered species. We suggest more research findings are needed to well understand and ensure regional effective conservation on the plant species occurred in the dry valleys.

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Chloroplast phylogeography of Dipentodon (Dipentodontaceae) in southwest China and northern Vietnam

Cited by 88 publications

References 51 publications

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

Phylogeographic structure of Terminalia franchetii (Combretaceae) in southwest China and its implications for drainage geological history

Diversity and conservation of plant species in dry valleys, southwest China

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