A massive tsunami promoted gene flow and increased genetic diversity in a near threatened plant species

Ohbayashi, Kako; Hodoki, Yoshikuni; Kondo, Norihiko; Kunii, Hidenobu; Shimada, Muneaki

doi:10.1038/s41598-017-11270-5

Cited by 12 publications

(13 citation statements)

References 39 publications

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“…Thus, we did not find a clear demographic explanation for the effect of temperature seasonality on genetic diversity. Temperature stability might have promoted clonality in P. lanceolata, leading to lower genetic diversity (45). However, rates of sexual and clonal reproduction within species are often inversely related (46), and genetic diversity was unaffected by rates of sexual reproduction in our study.…”

Section: Hypothesis 3: Global Gene Flow Will Weaken Demographic Effeccontrasting

confidence: 50%

Global gene flow releases invasive plants from environmental constraints on genetic diversity

Smith

Hodkinson

Villellas

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

139

128

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When plants establish outside their native range, their ability to adapt to the new environment is influenced by both demography and dispersal. However, the relative importance of these two factors is poorly understood. To quantify the influence of demography and dispersal on patterns of genetic diversity underlying adaptation, we used data from a globally distributed demographic research network comprising 35 native and 18 nonnative populations of Plantago lanceolata. Species-specific simulation experiments showed that dispersal would dilute demographic influences on genetic diversity at local scales. Populations in the native European range had strong spatial genetic structure associated with geographic distance and precipitation seasonality. In contrast, nonnative populations had weaker spatial genetic structure that was not associated with environmental gradients but with higher within-population genetic diversity. Our findings show that dispersal caused by repeated, long-distance, human-mediated introductions has allowed invasive plant populations to overcome environmental constraints on genetic diversity, even without strong demographic changes. The impact of invasive plants may, therefore, increase with repeated introductions, highlighting the need to constrain future introductions of species even if they already exist in an area.

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Section: Hypothesis 3: Global Gene Flow Will Weaken Demographic Effeccontrasting

confidence: 50%

Global gene flow releases invasive plants from environmental constraints on genetic diversity

Smith

Hodkinson

Villellas

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

139

128

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“…Previous studies have shown that outcrossing plants can preserve a degree of genetic diversity through frequent gene flow among populations, while genetic differentiation can effectively be eliminated when gene flow per generation is very low 52,53 . This is reflected in our demonstration that the populations of outcrossing Z .…”

Section: Discussionmentioning

confidence: 99%

Comparative studies on population genetic structure of two closely related selfing and outcrossing Zingiber species in Hainan Island

Huang

Chu

et al. 2019

Sci Rep

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How mating system impacts the genetic diversity of plants has long fascinated and puzzled evolutionary biologists. Numerous studies have shown that self-fertilising plants have less genetic diversity at both the population and species levels than outcrossers. However, the phylogenetic relationships between species and correlated ecological traits have not been accounted for in these previous studies. Here, we conduct a comparative population genetic study of two closely related selfing and outcrossing Zingiber species, with sympatric distribution in Hainan Island, and obtain a result contrary to previous studies. The results indicate that selfing Z. corallinum can maintain high genetic diversity through differentiation intensified by local adaptation in populations across the species’ range. In contrast, outcrossing Z. nudicarpum preserves high genetic diversity through gene exchange by frequent export of pollen within or among populations. Contrary to expectations, the major portion of genetic variation of outcrossing Z. nudicarpum may exist among populations, depending on the dispersal ability of pollen and seed. Our results also reveal that the main factor affecting population structure of selfing Z. corallinum is mountain ranges, followed by a moist climate, while that of outcrossing Z. nudicarpum is likely moisture, but not mountain ranges, due to gene flow via pollen.

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“…Honnay and Jacquemyn (2007) concluded that outcrossing species were more vulnerable than selfing species to the loss of genetic variation through habitat fragmentation. The role of gene flow in maintaining genetic diversity in outbreeding species is very important; it can maintain a high degree of genetic diversity in a population by frequent exchange of genes with other populations and even a very few migrants per generation are sufficient to counter genetic differentiation ( Wright 1931 ; Jacquemyn et al 2007 ; Ohbayashi et al 2017 ). Aguilar et al (2008) also suggested that mixed-mating and selfing species suffer fewer losses of alleles and polymorphic loci than self-incompatible and outcrossing species in fragmented populations by reduced gene flow.…”

Section: Introductionmentioning

confidence: 99%

Genetic variation and genetic structure within metapopulations of two closely related selfing and outcrossingZingiberspecies (Zingiberaceae)

Huang

Zhang

et al. 2020

AoB PLANTS

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Habitat fragmentation strongly affects the genetic diversity of plant populations, and this has always attracted much research interest. Although numerous studies have investigated the effects of habitat fragmentation on the genetic diversity of plant populations, fewer studies have compared species with contrasting breeding systems while accounting for phylogenetic distance. Here, we compare the levels of genetic diversity and differentiation within and among subpopulations in metapopulations (at fine-scale level) of two closely related Zingiber species, selfing Zingiber corallinum and outcrossing Zingiber nudicarpum. Comparisons of the genetic structure of species from unrelated taxa may be confounded by the effects of correlated ecological traits or/and phylogeny. Thus, we possibly reveal the differences in genetic diversity and spatial distribution of genetic variation within metapopulations that relate to mating systems. Compared to outcrossing Z. nudicarpum, the subpopulation genetic diversity in selfing Z. corallinum was significantly lower, but the metapopulation genetic diversity was not different. Most genetic variation resided among subpopulations in selfing Z. corallinum metapopulations, while a significant portion of variation resided either within or among subpopulations in outcrossing Z. nudicarpum, depending on whether the degree of subpopulation isolation surpass the dispersal ability of pollen and seed. A stronger spatial genetic structure appeared within subpopulations of selfing Z. corallinum potentially due to restricted pollen flow and seed dispersal. In contrast, a weaker genetic structure was apparent in subpopulations of outcrossing Z. nudicarpum most likely caused by extensive pollen movement. Our study shows that high genetic variation can be maintained within metapopulations of selfing Zingiber species, due to increased genetic differentiation intensified primarily by the stochastic force of genetic drift among subpopulations. Therefore, maintenance of natural variability among subpopulations in fragmented areas is key to conserve the full range of genetic diversity of selfing Zingiber species. For outcrossing Zingiber species, maintenance of large populations is an important factor to enhance genetic diversity.

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A massive tsunami promoted gene flow and increased genetic diversity in a near threatened plant species

Cited by 12 publications

References 39 publications

Global gene flow releases invasive plants from environmental constraints on genetic diversity

Global gene flow releases invasive plants from environmental constraints on genetic diversity

Comparative studies on population genetic structure of two closely related selfing and outcrossing Zingiber species in Hainan Island

Genetic variation and genetic structure within metapopulations of two closely related selfing and outcrossingZingiberspecies (Zingiberaceae)

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