Population genetic variability and structure of Elymus breviaristatus (Poaceae: Triticeae) endemic to Qinghai–Tibetan Plateau inferred from SSR markers

Gu, Xiao-yan; Guo, Zhihui; Ma, Xiao; Bai, Shiqie; Zhang, Xinquan; Zhang, Chang-bing; Chen, Shiyong; Peng, Yan; Yan, Yan-hong; Huang, Linkai; Zhou, Kai; Chaojie, Zhou; Fu, Kai-Xin

doi:10.1016/j.bse.2014.12.009

Cited by 13 publications

(23 citation statements)

References 39 publications

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“…Secondly, this species is perennial plant and have short rhizomes in growth living habit, whose propagated progenies and daughter ramets helped these current fragmented populations to maintain their historical genetic diversity for a long time when these populations were connected [41]. In addition to molecular markers, allozyme markers are normally also one of the important method for genetic diversity studying though the result were different for E. breviaristatus populations from similar eco-region [18]. As dominant markers, SRAP markers could reveal higher genetic polymorphism in E. breviaristatus than with allozyme markers (PPB = 92.37% for SRAP markers and PPB = 57.1% for allozyme markers, Table S6), which showed that the SRAP markers had more effectiveness than allozyme in analyzing genetic diversity, which was also proved by Wang et al [42].…”

Section: Genetic Diversity At Species and Population Levelsmentioning

confidence: 99%

“…Despite previous work in E. breviaristatus demonstrating its tolerance to abiotic stress, performance of growth and herbage yield [15], phenotypic diversity [13], breeding and domestication of wild germplasm [16], and phylogenetic relationships [17], little attention to date has been paid to the population structure across its distribution in the QTP. Only two previous reports using isozyme and SSR marker analysis have been published, both of which found higher genetic variation among populations and moderate variation within populations [18]. Because of the limited number of markers and populations used, this previous study focused on population demography rather than adaptive evolution driven by environmental factors.…”

Section: Introductionmentioning

confidence: 95%

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Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau

Liu

Xiong

et al. 2019

Sustainability

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Elymus breviaristatus is a grass species only distributed in the southeast of Qinghai-Tibetan Plateau (QTP), which has suffered from serious habitat fragmentation. Therefore, understanding patterns of genetic diversity within and among natural E. breviaristatus populations could provide insight for future conservation strategies. In this study, sequence-related amplified polymorphism markers were employed to investigate the genetic diversity and hierarchical structure of seven E. breviaristatus populations from QTP, China. Multiple measures of genetic diversity indicated that there is low to moderate genetic variation within E. breviaristatus populations, consistent with its presumed mating system. In spite of its rarity, E. breviaristatus presented high genetic diversity that was equivalent to or even higher than that of widespread species. Bayesian clustering approaches, along with clustering analysis and principal coordinate analysis partitioned the studied populations of E. breviaristatus into five genetic clusters. Differentiation coefficients (Fst, GST, etc.) and AMOVA analysis revealed considerable genetic divergence among different populations. BARRIER analyses indicated that there were two potential barriers to gene flow among the E. breviaristatus populations. Despite these patterns of differentiation, genetic distances between populations were independent of geographic distances (r = 0.2197, p = 0.2534), indicating little isolation by distance. Moreover, despite detecting a common outlier by two methods, bioclimatic factors (altitude, annual mean temperature, and annual mean precipitation) were not related to diversity parameters, indicating little evidence for isolation caused by the environment. These patterns of diversity within and between populations are used to propose a conservation strategy for E. breviaristatus.

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Section: Genetic Diversity At Species and Population Levelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau

Liu

Xiong

et al. 2019

Sustainability

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“…High genetic diversity is fundamental for the ability of a species to survive and develop [ 12 ]. It is often associated with traits that enable a species to adapt, such as expanding their distribution range and creating a new niche [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Genetic Structure and Eco-Geographical Differentiation of Wild Sheep Fescue (Festuca ovina L.) in Xinjiang, Northwest China

Zhang

Zhang²,

Fan

et al. 2017

Molecules

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Glaciation and mountain orogeny have generated new ecologic opportunities for plants, favoring an increase in the speciation rate. Moreover, they also act as corridors or barriers for plant lineages and populations. High genetic diversity ensures that species are able to survive and adapt. Gene flow is one of the most important determinants of the genetic diversity and structure of out-crossed species, and it is easily affected by biotic and abiotic factors. The aim of this study was to characterize the genetic diversity and structure of an alpine species, Festuca ovina L., in Xinjiang, China. A total of 100 individuals from 10 populations were analyzed using six amplified fragment length polymorphism (AFLP) primer pairs. A total of 583 clear bands were generated, of which 392 were polymorphic; thus, the percentage of polymorphic bands (PPB) was 67.24%. The total and average genetic diversities were 0.2722 and 0.2006 (0.1686–0.2225), respectively. The unweighted group method with arithmetic mean (UPGMA) tree, principal coordinates analysis (PCoA) and Structure analyses revealed that these populations or individuals could be clustered into two groups. The analysis of molecular variance analysis (AMOVA) suggested that most of the genetic variance existed within a population, and the genetic differentiation (Fst) among populations was 20.71%. The Shannon differentiation coefficient (G’st) among populations was 0.2350. Limited gene flow (Nm = 0.9571) was detected across all sampling sites. The Fst and Nm presented at different levels under the genetic barriers due to fragmentation. The population genetic diversity was significant relative to environmental factors such as temperature, altitude and precipitation.

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“…Elymus breviaristatus (Keng) Keng ex Keng f. is a bunch‐type, self‐pollinating, short‐lived perennial, hexaploid species of Triticeae with an unknown genome, occurring in the plateau grassland and desert of north‐western China at 3000–3600 m (Kuo, ; Zhou et al ., ; Li et al ., ; Gu et al ., ). Morphologically, E. breviaristatus is similar to E. sibiricus L. The latter is an StH ‐genome tetraploid having multiple spikelets at each rachis node and small glumes.…”

Section: Introductionmentioning

confidence: 97%

Genomic constitution and taxonomy of the Chinese hexaploidsElymus cylindricusandE. breviaristatus(Poaceae: Triticeae)

et al. 2016

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Elymus cylindricus (2n = 6x = 42) and E. breviaristatus (2n = 6x = 42) are distributed in grasslands and deserts of northern and north-western China. Their genomic constitution and taxonomic status are unclear. Elymus cylindricus was crossed with E. wawawaiensis J.R.Carlson & Barkworth (StH), Roegneria grandis Keng (StY) and Campeiostachys dahurica (Turcz. ex Griseb.) B.R.Baum, J.L.Yang & C.Yen var. dahurica (StYH). Meiotic pairing in the hybrids E. cylindricus 9 E. wawawaiensis (StH), E. cylindricus 9 R. grandis (StY) and E. cylindricus 9 C. dahurica var. dahurica (StYH) showed on average 10.00, 11.30 and 20.92 bivalents per cell, respectively. Elymus breviaristatus was crossed with C. dahurica var. dahurica (StYH) and E. cylindricus. Chromosome pairing in the hybrids of E. breviaristatus 9 C. dahurica var. dahurica and E. breviaristatus 9 E. cylindricus showed on average 19.60 and 19.27 bivalents, respectively. Genomic in situ hybridization (GISH) revealed the presence of St, Y and H genomes in E. cylindricus and E. breviaristatus. An intergenomic rearrangement was observed in E. cylindricus using GISH. Meiotic pairing data and GISH indicated that both E. cylindricus and E. breviaristatus are allohexaploids containing the StYH genomes. Elymus cylindricus and E. breviaristatus should be treated as Campeiostachys dahurica var. cylindrica and Campeiostachys breviaristata, respectively.

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Population genetic variability and structure of Elymus breviaristatus (Poaceae: Triticeae) endemic to Qinghai–Tibetan Plateau inferred from SSR markers

Cited by 13 publications

References 39 publications

Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau

Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau

Genetic Structure and Eco-Geographical Differentiation of Wild Sheep Fescue (Festuca ovina L.) in Xinjiang, Northwest China

Genomic constitution and taxonomy of the Chinese hexaploidsElymus cylindricusandE. breviaristatus(Poaceae: Triticeae)

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