Genetic Diversity and Population Structure of the Endemic Disjunct Species, Helenium virginicum (Asteraceae)

Knox, John S.; Bezold, Kelly; Cabe, Paul R.; Williams, Sharon; Simurda, Maryanne C.

doi:10.1674/0003-0031-175.2.242

Cited by 6 publications

(2 citation statements)

References 55 publications

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“…A species with low genetic diversity lacks the evolutionary flexibility to cope with a changing ecological environment and is passive in longer-term evolutionary processes (Genton, Shykoff, & Giraud, 2005). Thus, a species with low level of genetic diversity is relatively more vulnerable to get extinction (Chen et al, 2015;Knox, Bezold, Cabe, Williams, & Simurda, 2016;Nolan, Noyes, Bennett, Hunter, & Hunter, 2010). In contrast, a high level of genetic diversity tends to be associated with successful ecological adaptation (Ortego, Noguerales, Gugger, & Sork, 2015).…”

Section: Genetic Divergence and Diversitymentioning

confidence: 99%

Population genetic structure, migration, and polyploidy origin of a medicinal species Gynostemma pentaphyllum (Cucurbitaceae)

Zhang

Yang

et al. 2019

Ecology and Evolution

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Gynostemma pentaphyllum, a member of family Cucurbitaceae, is a perennial creeping herb used as a traditional medicinal plant in China. In this study, six polymorphic nSSR and four EST‐SSR primers were used to genotype 1,020 individuals in 72 wild populations of G. pentaphyllum. The genetic diversity and population structure were investigated, and ecological niche modeling was performed to reveal the evolution and demographic history of its natural populations. The results show that G. pentaphyllum has a low level of genetic diversity and high level of variation among populations because of pervasive asexual propagation, genetic drift, and long‐term habitat isolation. Results of the Mantel test demonstrate that the genetic distance and geographic distance are significantly correlated among G. pentaphyllum natural populations. The populations can be divided into two clusters on the basis of genetic structure. Asymmetrical patterns of historical gene flow were observed among the clusters. For the contemporary, almost all the bidirectional gene flow of the related pairs was symmetrical with slight differences. Recent bottlenecks were experienced by 34.72% of the studied populations. The geographic range of G. pentaphyllum continues to expand northward and eastward from Hengduan Mountains. The present distribution of G. pentaphyllum is a consequence of its complex evolution. Polyploidy in G. pentaphyllum is inferred to be polygenetic. Finally, G. pentaphyllum is a species in need of protection, so in situ and ex situ measures should be considered in the future.

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Section: Genetic Divergence and Diversitymentioning

confidence: 99%

Population genetic structure, migration, and polyploidy origin of a medicinal species Gynostemma pentaphyllum (Cucurbitaceae)

Zhang

Yang

et al. 2019

Ecology and Evolution

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“…In general, the level of genetic diversity possessed by a species reflects its prepared evolutionary potential. Therefore, species with low levels of genetic diversity are more likely to become extinct [20]. During the process of production and cultivation, the comprehensive performance of tetraploid kiwifruit is often better than that of diploid germplasms, especially in stress resistance.…”

Section: Genetic Diversity Of Diploids and Tetraploidsmentioning

confidence: 99%

Characterizing Tetraploid Populations of Actinidia chinensis for Kiwifruit Genetic Improvement

Wang

et al. 2022

Plants

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Understanding genetic diversity and structure in natural populations and their suitable habitat response to environmental changes is critical for the protection and utilization of germplasm resources. We evaluated the genetic diversity and structure of 24 A. chinensis populations using simple sequence repeat (SSR) molecular markers. The potential suitable distribution of tetraploid A. chinensis estimated under the current climate and predicted for the future climate was generated with ecological niche modeling (ENM). The results indicated that the polyploid populations of A.chinensis have high levels of genetic diversity and that there are distinct eastern and western genetic clusters. The population structure of A. chinensis can be explained by an isolation-by-distance model. The results also revealed that potentially suitable areas of tetraploids will likely be gradually lost and the habitat will likely be increasingly fragmented in the future. This study provides an extensive overview of tetraploid A. chinensis across its distribution range, contributing to a better understanding of its germplasm resources. These results can also provide the scientific basis for the protection and sustainable utilization of kiwifruit wild resources.

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Ecological niche modelling and genetic diversity of Anomochloa marantoidea (Poaceae): filling the gaps for conservation in the earliest-diverging grass subfamily

Vieira

Schnadelbach

Hughes³

et al. 2019

Botanical Journal of the Linnean Society

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Anomochlooideae (Poaceae) represent the earliest-diverging extant lineage of grasses. One of the two genera is the monotypic Anomochloa, which is extremely rare and restricted to the Atlantic Forest of southern Bahia state in Brazil, where only two natural populations have been recorded to date. Knowledge of A. marantoidea is considered crucial to understanding evolutionary and diversification patterns in Poaceae. Despite this, knowledge of the biology and distribution of A. marantoidea remain incomplete, and thus the conservation of this poorly known species is problematic. We used niche modelling to estimate its current distribution and assess potential ranges in situ to explore new occurrences. In addition, genetic diversity and the factors that disrupt gene flow between populations of this species were estimated using molecular markers. Two new populations were documented; the modelled ecological niche indicates high climatic restriction, but also revealed suitable sites for the establishment of new populations. Genetic diversity is correlated to population size, and genetic structure analysis suggests recent fragmentation and low gene flow among the remaining populations, which exhibit high levels of inbreeding. These levels also indicate the capacity of A. marantoidea to respond favourably to selection and, thus, that a conservation plan could be designed to maintain the current genetic diversity.

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Genetic Diversity and Population Structure of the Endemic Disjunct Species, Helenium virginicum (Asteraceae)

Cited by 6 publications

References 55 publications

Population genetic structure, migration, and polyploidy origin of a medicinal species Gynostemma pentaphyllum (Cucurbitaceae)

Population genetic structure, migration, and polyploidy origin of a medicinal species Gynostemma pentaphyllum (Cucurbitaceae)

Characterizing Tetraploid Populations of Actinidia chinensis for Kiwifruit Genetic Improvement

Ecological niche modelling and genetic diversity of Anomochloa marantoidea (Poaceae): filling the gaps for conservation in the earliest-diverging grass subfamily

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