The Tanaka Line shaped the phylogeographic pattern of the cotton tree (Bombax ceiba) in southwest China

Tian, Bin; Zhou, Zhili; Du, Fang; He, Chengzhong; Xin, Peiyao; Ma, Haiching

doi:10.1016/j.bse.2015.04.014

Cited by 19 publications

(16 citation statements)

References 38 publications

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“…This result is similar to that obtained based on chloroplast DNA data in a previous study by Tian et al. (). However, in the present study, we detected the gene flow among populations based on SSR markers.…”

Section: Discussionsupporting

confidence: 93%

“…Clustering analysis based on UPGMA and Bayesian methods suggested that the 17 natural B. ceiba populations could be divided into two genetically divergent clusters (Figures 2 and 4) located on either side of the Tanaka Line. This result is similar to that obtained based on chloroplast DNA data in a previous study by Tian et al (2015). However, in the present study, we detected the gene flow among populations based on SSR markers.…”

Section: Population Structuresupporting

confidence: 93%

“…The specific habitat range of wild B. ceiba provides an opportunity to verify whether the Tanaka Line has acted as a geological or climatic barrier to affect population structure formation. In our previous study (Tian et al., ), we analyzed phylogeographic patterns based on three chloroplast DNA regions ( psb B‐ psb F, trn L‐ rpl 32, and psb I‐ psb K) in 17 natural B. ceiba populations (201 individuals), where the results showed that the main reasons for differences in the genetic structure of B. ceiba either side of the Tanaka Line are historical climate change and complex topographical conditions (Tian et al., ). However, it is not clear whether there is an intraspecific divergence pattern in this species where apparent gene flow occurs across the Tanaka Line.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Tanaka Line on the genetic structure of Bombax ceiba (Malvaceae) in dry‐hot valley areas of southwest China

Zhao

et al. 2018

Ecology and Evolution

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Southwest China is an important biodiversity hotspot. The interactions among the complex topography, climate change, and ecological factors in the dry‐hot valley areas in southwest China may have profoundly affected the genetic structure of plant species in this region. In this study, we determined the effects of the Tanaka Line on genetic variation in the wild Bombax ceiba tree in southwest China. We sampled 224 individuals from 17 populations throughout the dry‐hot valley regions. Six polymorphic expressed sequence tag–simple sequence repeat primers were employed to sequence the PCR products using the first‐generation Sanger technique. The analysis based on population genetics suggested that B. ceiba exhibited a high level of gene diversity (H E: 0.2377–0.4775; I: 0.3997–0.7848). The 17 populations were divided into two groups by cluster analysis, which corresponded to geographic characters on each side of the Tanaka Line. In addition, a Mantel test indicated that the phylogeographic structure among the populations could be fitted to the isolation‐by‐distance model (r 2 = .2553, p < .001). A barrier test indicated that there were obstacles among populations and between the two groups due to complex terrain isolation and geographic heterogeneity. We inferred that the Tanaka Line might have promoted the intraspecific phylogeographic subdivision and divergence of B. ceiba. These results provide new insights into the effects of the Tanaka Line on genetic isolation and population differentiation of plant species in southwest China.

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Section: Discussionsupporting

confidence: 93%

Section: Population Structuresupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Effects of the Tanaka Line on the genetic structure of Bombax ceiba (Malvaceae) in dry‐hot valley areas of southwest China

Zhao

et al. 2018

Ecology and Evolution

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“…The Mekong–Salween Valley (also named the “Tanaka–Kaiyong Line”) is a classical biogeographic boundary, which separates the Sino‐Himalayan and Sino‐Japanese floristic subkingdoms (Wu, Sun, Zhou, Li, & Peng, ). Some line of evidence has shown that this valley acted as both geological barrier and climatic divide possibly driving divergence in several species, such as Sophora davidii (Fan et al., ), Bombax ceiba (Tian et al., ), Leucomeris decora and Nouelia insignis (Zhao & Gong, ). However, this barrier appeared permeable for several species (e.g., Tsuga dumosa , Taxus wallichiana ) expanding their range to the west along the Yarlung Zangbo Valley or the Himalayas during interglacials (Cun & Wang, ; Liu et al., ).…”

Section: Discussionmentioning

confidence: 99%

Mapping the genetic patterns of plants in the region of the Qinghai–Tibet Plateau: Implications for conservation strategies

Favre

Sui

et al. 2018

Diversity and Distributions

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Aim: Species diversity in the region of the Qinghai-Tibet Plateau has been extensively explored, whereas the distribution of genetic diversity remains poorly understood in this species-rich area, parts of which are listed as biodiversity hotspots. In this study, we aimed to map the patterns of genetic diversity and divergence of plant species in this region, and to identify potential evolutionary hotspots for conservation planning.Location: Region of the Qinghai-Tibet Plateau (QTP). Methods:We compiled published molecular data for 60 plant species, and calculated intra-population genetic diversity and inter-population genetic divergence using haplotype sequences (chloroplast or mitochondrial DNA). We analysed the relationships between genetic diversity and longitude, latitude and elevation. We mapped the landscapes of genetic diversity and divergence for each species in GIS, and combined the resulting landscapes in order to identify hotspots of high genetic diversity and divergence.Results: There were no significant relationships between genetic diversity and longitude, latitude and elevation. For most species, areas characterized by high genetic diversity and divergence were located across the Hengduan Mountains. Nine evolutionary hotspots across the region of the QTP were identified. Main conclusions:The Hengduan Mountains are a remarkable hotspot of all three dimensions of biodiversity (genes, species and ecosystems), yet patterns of genetic diversity were partially incongruent with the distribution of species diversity. For example, several hotspots of genetic diversity were located on the QTP proper, which is relatively species poor. This partial geographic mismatch between species and genetic diversity highlights the need to consider both aspects in conservation programs. Our study suggests that more protected areas in the region of the QTP need to be established in order to protect genetic diversity and thus adaptive potential. K E Y W O R D Sbiodiversity conservation, comparative phylogeography, evolutionary hotspots, genetic divergence, genetic diversity, Qinghai-Tibet Plateau, Quaternary refugia | 311 YU et al. Pedicularis kansuensisA,

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“…Supporting evidence of diversification along the ‘Tanaka Line’ of Southwest China flora, was only found in a limited number of phylogeographic studies. However, most of these studies suggested intraspecific divergences profoundly affected by the Mid/Late Pleistocene climatic oscillations in this area, interspecific divergence during the Pliocene/ Early-Pleistocene was seldom revealed ( Zhang et al, 2006 ; Fan et al, 2013 ; Tian et al, 2015 ; Zhao and Zhang, 2015 ). Our estimated divergence time indicates the divergence may be closely associated with the climatic transformation from Pliocene to Pleistocene.…”

Section: Discussionmentioning

confidence: 92%

Ecological and Genetic Divergences with Gene Flow of Two Sister Species (Leucomeris decora and Nouelia insignis) Driving by Climatic Transition in Southwest China

et al. 2018

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Understanding of the processes of divergence and speciation is a major task for biodiversity researches and may offer clearer insight into mechanisms generating biological diversity. Here, we employ an integrative approach to explore genetic and ecological differentiation of Leucomeris decora and Nouelia insignis distributed allopatrically along the two sides of the biogeographic boundary 'Tanaka Line' in Southwest China. We addressed these questions using ten low-copy nuclear genes and nine plastid DNA regions sequenced among individuals sampled from 28 populations across their geographic ranges in China. Phylogenetic, coalescent-based population genetic analyses, approximate Bayesian computation (ABC) framework and ecological niche models (ENMs) were conducted. We identified a closer phylogenetic relationship in maternal lineage of L. decora with N. insignis than that between L. decora and congeneric Leucomeris spectabilis. A deep divergence between the two species was observed and occurred at the boundary between later Pliocene and early Pleistocene. However, the evidence of significant chloroplast DNA gene flow was also detected between the marginal populations of L. decora and N. insignis. Niche models and statistical analyses showed significant ecological differentiation, and two nuclear loci among the ten nuclear genes may be under divergent selection. These integrative results imply that the role of climatic shift from Pliocene to Pleistocene may be the prominent factor for the divergence of L. decora and N. insignis, and population expansion after divergence may have given rise to chloroplast DNA introgression. The divergence was maintained by differential selection despite in the face of gene flow.

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The Tanaka Line shaped the phylogeographic pattern of the cotton tree (Bombax ceiba) in southwest China

Cited by 19 publications

References 38 publications

Effects of the Tanaka Line on the genetic structure of Bombax ceiba (Malvaceae) in dry‐hot valley areas of southwest China

Effects of the Tanaka Line on the genetic structure of Bombax ceiba (Malvaceae) in dry‐hot valley areas of southwest China

Mapping the genetic patterns of plants in the region of the Qinghai–Tibet Plateau: Implications for conservation strategies

Ecological and Genetic Divergences with Gene Flow of Two Sister Species (Leucomeris decora and Nouelia insignis) Driving by Climatic Transition in Southwest China

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