The Genetic Mosaic of<i>Iris</i>Series<i>Hexagonae</i>in Florida: Inferences on the Holocene History of the Louisiana Irises and Anthropogenic Effects on Their Distribution

Meerow, Alan W.; Gideon, Michael; Kuhn, David N.; Mopper, Kenneth; Nakamura, Kyoko

doi:10.1086/661295

Cited by 10 publications

(34 citation statements)

References 106 publications

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“…Although there is some information concerning population genetic variation in I. hexagona (Meerow et al. ), the geographic distribution of genetic diversity for two of the species, I. brevicaulis and I. fulva , has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Determining population structure and hybridization for two iris species

Hamlin

Arnold

2014

Ecology and Evolution

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Identifying processes that promote or limit gene flow can help define the ecological and evolutionary history of a species. Furthermore, defining those factors that make up “species boundaries” can provide a definition of the independent evolutionary trajectories of related taxa. For many species, the historic processes that account for their distribution of genetic variation remain unresolved. In this study, we examine the geographic distribution of genetic diversity for two species of Louisiana Irises, Iris brevicaulis and Iris fulva. Specifically, we asked how populations are structured and if population structure coincides with potential barriers to gene flow. We also asked whether there is evidence of hybridization between these two species outside Louisiana hybrid zones. We used a genotyping-by-sequencing approach and sampled a large number of single nucleotide polymorphisms across these species' genomes. Two different population assignment methods were used to resolve population structure in I. brevicaulis; however, there was considerably less population structure in I. fulva. We used a species tree approach to infer phylogenies both within and between populations and species. For I. brevicaulis, the geography of the collection locality was reflected in the phylogeny. The I. fulva phylogeny reflected much less structure than detected for I. brevicaulis. Lastly, combining both species into a phylogenetic analysis resolved two of six populations of I. brevicaulis that shared alleles with I. fulva. Taken together, our results suggest major differences in the level and pattern of connectivity among populations of these two Louisiana Iris species.

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Section: Introductionmentioning

confidence: 99%

Determining population structure and hybridization for two iris species

Hamlin

Arnold

2014

Ecology and Evolution

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“…Slight amounts of salt cause severe physiological stress in freshwater plants (Hasegawa et al, 2000; Xiong and Zhu, 2002) because energy must be allocated to process Na + ions and to synthesize the osmolytes that balance water potential (Wang et al, 2008). Even among I. hexagona populations that are adapted to salinity (Pathikonda et al, 2010; Meerow et al, 2011), NaCl as low as 4 ppt can significantly affect endogenous hormones (Wang et al, 2001), reproductive mode (Van Zandt et al, 2003), flowering phenology (Van Zandt and Mopper, 2002), leaf senescence (Schile and Mopper, 2006), seed germination (Van Zandt and Mopper, 2004), florivory (Geddes and Mopper, 2006; Tobler et al, 2006), and herbivory (Wang and Mopper, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Iris hexagona is endemic to marshes and riparian zones in North America (Bennett and Grace, 1990; Meerow et al, 2011). In Louisiana, large, expansive populations inhabit freshwater and intermediate‐salinity coastal marsh, and smaller colonies occur in brackish wetlands (Van Zandt and Mopper, 2002).…”

Section: Methodsmentioning

confidence: 99%

“…Iris hexagona , series Hexagonae , is in a monophyletic complex of five species and associated hybrids, known as Louisiana irises (Meerow et al, 2011). Our previous work demonstrated profound effects of salinity on I. hexagona physiology, ecology, and reproduction (Wang et al, 2001, 2008; Van Zandt and Mopper, 2002, 2004; Van Zandt et al, 2003; Mopper et al, 2004; Geddes and Mopper, 2006; Schile and Mopper, 2006; Tobler et al, 2006; Wang and Mopper, 2008; Pathikonda et al, 2008, 2010).…”

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confidence: 99%

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Competition, salinity, and clonal growth in native and introduced irises

Mopper¹,

Wiens

Goranova

2016

American J of Botany

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Our results demonstrate that salt stress strongly reduced clonal reproduction in native and introduced irises; however, the introduced iris had a competitive advantage over the native, regardless of environmental salinity levels. Based on patterns in clonal reproduction, the introduced iris could potentially threaten native iris populations. We are currently investigating seed production and mortality during competition and stress because both clonal and sexual reproduction must be considered when predicting long-term population dynamics.

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“…Besides, secondary contact of diverged species, due to habitat disturbance, is thought to promote the formation of hybrid zones (Abbott, 2017). A handful of cases to date revealed that anthropogenic disturbance potentially promotes hybridization by extending and altering plant phenology, especially for flowering time, creating opportunities for species to exchange genes that otherwise would not under undisturbed conditions (Ellstrand & Schierenbeck, 2000;Lamont, He, Enright, Krauss, & Miller, 2003;Meerow, Gideon, Kuhn, Mopper, & Nakamura, 2011;Ortego, Gugger, & Sork, 2017;Vallejo-Marín & Hiscock, 2016;Yakimowski & Rieseberg, 2014).…”

Section: The Effect Of Anthropogenic Disturbancementioning

confidence: 99%

Homoploid hybridization of plants in the Hengduan mountains region

Yang

Folk

Zhang

et al. 2019

Ecology and Evolution

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The Hengduan Mountains Region (HMR) is a major global biodiversity hotspot. Complex tectonic and historical climatic conditions created opportunities for natural interspecific hybridization. Likewise, anthropogenic disturbance potentially raises the frequency of hybridization. Among species studies to date, the frequency of homoploid hybridization appears in the HMR. Of nine taxa in which natural hybridization has been detected, three groups are involved in homoploid hybrid speciation, and species pairs from the remaining six genera suggest that continuous gene flow occurs in hybrid zones. Reproductive isolation may greatly affect the dynamic and architecture of hybrid zones in the HMR. Asymmetrical hybridization and introgression can primarily be attributed to both prezygotic and postzygotic barriers. The frequent observation of such asymmetry may imply that reproductive barrier contributes to maintaining species boundaries in the alpine region. Ecological isolations with environmental disturbance may promote breeding barriers between parental species and hybrids. Hybrid zones may be an important phase for homoploid hybrid speciation. Hybrid zones potentially provided abundant genetic resources for the diversification of the HMR flora. The ecological and molecular mechanisms of control and mediation for natural hybridization will help biologists to understand the formation of biodiversity in the HMR. More researches from ecological and molecular aspects were required in future studies.

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The Genetic Mosaic ofIrisSeriesHexagonaein Florida: Inferences on the Holocene History of the Louisiana Irises and Anthropogenic Effects on Their Distribution

Cited by 10 publications

References 106 publications

Determining population structure and hybridization for two iris species

Determining population structure and hybridization for two iris species

Competition, salinity, and clonal growth in native and introduced irises

Homoploid hybridization of plants in the Hengduan mountains region

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