scholarly journals Was maize domesticated in the Balsas Basin? Complex patterns of genetic divergence, gene flow and ancestral introgressions among Zea subspecies suggest an alternative scenario

2017 ◽  
Author(s):  
Alejandra Moreno-Letelier ◽  
J.A. Aguirre-Liguori ◽  
Maud I. Tenaillon ◽  
Daniel Piñero ◽  
Brandon S. Gaut ◽  
...  
Keyword(s):  
Zea Mays ◽  
Gene Flow ◽  
Pacific Coast ◽  
Population History ◽  
Geographic Structure ◽  
The Pacific ◽  
History Of ◽  
Maize Landraces ◽  
Maize Domestication ◽  
Shared Polymorphism

AbstractThe study of maize domestication has overlooked the genetic structure within maize’s wild relative teosinte. Prior to investigating the domestication history of maize (Zea mays subspecies mays), one should first understand the population history of teosintes and how they relate to maize. To achieve this, we used 32,739 SNPs obtained from a broad sampling of teosinte populations and 46 maize landraces and a) inferred current and past gene flow among teosinte populations and maize, b) analyzed the degree of introgression among Zea mays subspecies, and c) explored the putative domestication location of maize. We found geographic structure and introgression between Zea mays taxa. Teosinte subspecies have diverged significantly from maize, which indicates that current teosinte populations have evolved mainly independently from maize since the domestication. Our results further suggest that the likely ancestor of maize may maybe have come from Jalisco or the Pacific coast.One Sentence SummaryShared polymorphism in teosinte suggests a Jalisco origin of maize domestication.

scholarly journals The relevance of gene flow with wild relatives in understanding the domestication process

2020 ◽  
Vol 7 (4) ◽  
pp. 191545
Author(s):  
Alejandra Moreno-Letelier ◽  
Jonás A. Aguirre-Liguori ◽  
Daniel Piñero ◽  
Alejandra Vázquez-Lobo ◽  
Luis E. Eguiarte
Keyword(s):  
Zea Mays ◽  
Gene Flow ◽  
Evolutionary Dynamics ◽  
Wild Relatives ◽  
Nucleotide Polymorphisms ◽  
History Of ◽  
Maize Landraces ◽  
Different Populations ◽  
Domestication Process ◽  
The Many

The widespread use of genomic tools has allowed for a deeper understanding of the genetics and the evolutionary dynamics of domestication. Recent studies have suggested that multiple domestications and introgression are more common than previously thought. However, the ability to correctly infer the many aspects of domestication process depends on having an adequate representation of wild relatives. Cultivated maize ( Zea mays ssp. mays ) is one of the most important crops in the world, with a long and a relatively well-documented history of domestication. The current consensus points towards a single domestication event from teosinte Zea mays ssp. parviglumis from the Balsas Basin in Southwestern Mexico. However, the underlying diversity of teosintes from Z. mays ssp . parviglumis and Zea mays ssp. mexicana was not taken into account in early studies. We used 32 739 single nucleotide polymorphisms (SNPs) obtained from 29 teosinte populations and 43 maize landraces to explore the relationship between wild and cultivated members of Zea. We then inferred the levels of gene flow among teosinte populations and maize, the degree of population structure of Zea mays subspecies, and the potential domestication location of maize. We confirmed a strong geographic structure within Z. mays ssp. parviglumis and documented multiple gene flow events with other members of the genus, including an event between Z. mays ssp. mexicana and maize. Our results suggest that the likely ancestor of maize may have been domesticated in Jalisco or in the southern Pacific Coast and not in the Balsas Basin as previously thought. In this context, different populations of both teosinte subspecies have contributed to modern maize's gene pool. Our results point towards a long period of domestication marked by gene flow with wild relatives, confirming domestication as long and ongoing process.

“Filipinos are the Dandies of the Foreign Colonies”: Race, Labor Struggles, and the Transpacific Routes of Hollywood and Philippine Films, 1924–1948

2012 ◽  
Vol 81 (3) ◽  
pp. 371-403
Author(s):  
Denise Khor
Keyword(s):  
Public Sphere ◽  
Pacific Coast ◽  
Cultural Encounters ◽  
Movie Theaters ◽  
Japanese Immigrants ◽  
The Pacific ◽  
History Of ◽  
Western City ◽  
Urban Leisure ◽  
The U.S

In the 1930s and 1940s Filipino laborers, many of whom were en route to agricultural hubs on the Pacific Coast, packed into movie theaters owned by Japanese immigrants to view Hollywood and Philippine-produced films. These cultural encounters formed an urban public sphere that connected both sides of the Pacific. Filipino patrons remade their public identities and communities through their consumption of film and urban leisure in the western city. This article traces this localized history of spectatorship and exhibition in order to reconsider prevailing understandings of the history of the U.S. West and the rise of cinema and mass commercial culture in the early twentieth century.

scholarly journals Framing "Nova Albion": Marking possession in Richard Hakluyt’s The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation

Sederi ◽  
2014 ◽  
pp. 47-68
Author(s):  
Colm MacCrossan
Keyword(s):  
North America ◽  
Pacific Coast ◽  
The Pacific ◽  
Sir Walter Ralegh ◽  
History Of ◽  
Territorial Claims

This article examines the textual framing of a cluster of items in Richard Hakluyt’s The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation (1598-1600) relating to the area on the Pacific coast of North America that Francis Drake named “Nova Albion.” Contextualised in relation to the colonial programmes of Sir Humphrey Gilbert and Sir Walter Ralegh, it explores how a variety of editorial techniques combine to encourage a particular understanding of the history of exploration in this region that privileges English territorial claims over those of Spain. What is revealed is a delicate negotiation of the tensions raised by Hakluyt’s use of pre-existing, mainly non-English materials to attempt to legitimise Drake’s actions by aligning them with the Spanish conquistadorial tradition, while at the same time down-playing the extent and significance of previous Spanish activity in that region.

scholarly journals Population structure and demographic history of the chukar partridge Alectoris chukar in China

2013 ◽  
Vol 59 (4) ◽  
pp. 458-474 ◽  
Author(s):  
Sen Song ◽  
Shijie Bao ◽  
Ying Wang ◽  
Xinkang Bao ◽  
Bei An ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
North America ◽  
Demographic History ◽  
Population Expansion ◽  
Northwest China ◽  
Population History ◽  
Extant Species ◽  
History Of ◽  
Chukar Partridge

Abstract Pleistocene climate fluctuations have shaped the patterns of genetic diversity observed in extant species. Although the effects of recent glacial cycles on genetic diversity have been well studied on species in Europe and North America, genetic legacy of species in the Pleistocene in north and northwest of China where glaciations was not synchronous with the ice sheet development in the Northern Hemisphere or or had little or no ice cover during the glaciations’ period, remains poorly understood. Here we used phylogeographic methods to investigate the genetic structure and population history of the chukar partridge Alec-toris chukar in north and northwest China. A 1,152 – 1,154 bp portion of the mtDNA CR were sequenced for all 279 specimens and a total number of 91 haplotypes were defined by 113 variable sites. High levels of gene flow were found and gene flow estimates were greater than 1 for most population pairs in our study. The AMOVA analysis showed that 81% and 16% of the total genetic variability was found within populations and among populations within groups, respectively. The demographic history of chukar was examined using neutrality tests and mismatch distribution analyses and results indicated Late Pleistocene population expansion. Results revealed that most populations of chukar experienced population expansion during 0.027 ? 0.06 Ma. These results are at odds with the results found in Europe and North America, where population expansions occurred after Last Glacial Maximum (LGM, 0.023 to 0.018 Ma). Our results are not consistent with the results from avian species of Tibetan Plateau, either, where species experienced population expansion following the retreat of the extensive glaciation period (0.5 to 0.175 Ma).

scholarly journals Denisovan ancestry and population history of early East Asians

2020 ◽  
Author(s):  
Diyendo Massilani ◽  
Laurits Skov ◽  
Mateja Hajdinjak ◽  
Byambaa Gunchinsuren ◽  
Damdinsuren Tseveendorj ◽  
...  
Keyword(s):  
Gene Flow ◽  
Human Population ◽  
Modern Human ◽  
Population History ◽  
East Asians ◽  
Aboriginal Australians ◽  
North East ◽  
History Of ◽  
Female Member ◽  
Admixture Event

AbstractWe present analyses of the genome of a ~34,000-year-old hominin skull cap discovered in the Salkhit Valley in North East Mongolia. We show that this individual was a female member of a modern human population that, following the split between East and West Eurasians, experienced substantial gene flow from West Eurasians. Both she and a 40,000-year-old individual from Tianyuan outside Beijing carried genomic segments of Denisovan ancestry. These segments derive from the same Denisovan admixture event(s) that contributed to present-day mainland Asians but are distinct from the Denisovan DNA segments in present-day Papuans and Aboriginal Australians.

Gene flow from multiple sources maintains high genetic diversity and stable population history of Common MoorhenGallinula chloropusin China

Ibis ◽  
2018 ◽  
Vol 160 (4) ◽  
pp. 855-869 ◽  
Author(s):  
Luzhang Ruan ◽  
Wei Xu ◽  
Yuqing Han ◽  
Chaoying Zhu ◽  
Bicai Guan ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Population History ◽  
Stable Population ◽  
Multiple Sources ◽  
High Genetic Diversity ◽  
History Of

scholarly journals Traces and Representations of the U.S.-Mexico Frontera

2018 ◽  
Vol 87 (1) ◽  
pp. 150-172
Author(s):  
Katherine G. Morrissey
Keyword(s):  
Pacific Coast ◽  
Mexican Revolution ◽  
Presidential Address ◽  
The United States ◽  
Border Region ◽  
The Other ◽  
The Pacific ◽  
History Of ◽  
The U.S ◽  
Visual History

The following was the author’s presidential address at the annual meeting of the Pacific Coast Branch, American Historical Association, in Northridge, California, on August 4, 2017. The twentieth-century visual history of the U.S.-Mexico borderlands, la frontera, offers a rich set of representations of the shared border environments. Photographs, distributed in the United States and in Mexico, allow us to trace emerging ideas about the border region and the politicized borderline. This essay explores two border visualization projects—one centered on the Mexican Revolution and the visual vocabulary of the Mexican nation and the other on the repeat photography of plant ecologists—that illustrate the simultaneous instability and power of borders.

scholarly journals Denisovan ancestry and population history of early East Asians

Science ◽  
2020 ◽  
Vol 370 (6516) ◽  
pp. 579-583
Author(s):  
Diyendo Massilani ◽  
Laurits Skov ◽  
Mateja Hajdinjak ◽  
Byambaa Gunchinsuren ◽  
Damdinsuren Tseveendorj ◽  
...  
Keyword(s):  
Gene Flow ◽  
Human Population ◽  
Modern Human ◽  
Population History ◽  
East Asians ◽  
Aboriginal Australians ◽  
History Of ◽  
East And West ◽  
Female Member ◽  
Admixture Event

We present analyses of the genome of a ~34,000-year-old hominin skull cap discovered in the Salkhit Valley in northeastern Mongolia. We show that this individual was a female member of a modern human population that, following the split between East and West Eurasians, experienced substantial gene flow from West Eurasians. Both she and a 40,000-year-old individual from Tianyuan outside Beijing carried genomic segments of Denisovan ancestry. These segments derive from the same Denisovan admixture event(s) that contributed to present-day mainland Asians but are distinct from the Denisovan DNA segments in present-day Papuans and Aboriginal Australians.

Phylogeography, postglacial gene flow, and population history of North American Northern Goshawks (Accipiter gentilis)

The Auk ◽  
2013 ◽  
Vol 130 (2) ◽  
pp. 342-354 ◽  
Author(s):  
Shelley Bayard de Volo ◽  
Richard T. Reynolds ◽  
Sarah A. Sonsthagen ◽  
Sandra L. Talbot ◽  
Michael F. Antolin
Keyword(s):  
Gene Flow ◽  
North American ◽  
Population History ◽  
Accipiter Gentilis ◽  
History Of ◽  
Northern Goshawks
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