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    Online Resource
    Differentiation and genetic diversity of Phaseolus lunatus wild populations from Chiapas, Mexico, and their genetic relationships with MI and MII groups
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2016
    In:  Botanical Sciences Vol. 94, No. 4 ( 2016-12-12), p. 712-
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 94, No. 4 ( 2016-12-12), p. 712-
    Abstract: Background . Understanding the genetic structure of wild relatives of domesticated species is crucial for its conservation and to elucidate the sites of crop domestication. Lima bean is one of the five domesticated Phaseolus species and Mexico is one of its centers of domestication. Recent studies showed the existence of two wild gene pools (MI and MII) of this species in Mexico and suggested that their genetic divergence occurred in southeast Mexico. Question . Did MI and MII groups diverged around the Isthmus of Tehuantepec, Mexico? Studied species . Lima bean: Neotropical plant species, herbaceous, with an annual/short life cycle and with autogamous tendency. Study site and years of study . Seven wild populations were collected in 2012 in the State of Chiapas, México, area underrepresented in previous studies. Methods . Genetic diversity and grouping patterns of collected populations and their relationship to MI and MII groups were analyzed at eight microsatellite loci. Results. High genetic structure ( F ST: 0.42 to 0.96) and a high level of genetic diversity ( H E = 0.48) were found. The analyses, and presence of admixed populations in MI and MII, suggested that the genetic divergence of these groups is an ongoing process centered around the Isthmus of Tehuantepec. Conclusions . Our results support the hypothesis that MI and MII groups diverged around the Isthmus of Tehuantepec; however, sampling should be increased both at population and genomic levels, to determine the precise organization of the genetic diversity of wild P. lunatus from Mexico
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.699
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2016
    detail.hit.zdb_id: 2679053-1
    SSG: 7,36
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  • 2
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    Online Resource
    Impact of Late Pleistocene-Holocene climatic fluctuations on the phylogeographic structure and historical demographics of Zamia prasina (Cycadales: Zamiaceae)
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2019
    In:  Botanical Sciences Vol. 97, No. 4 ( 2019-12-19), p. 588-608
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 97, No. 4 ( 2019-12-19), p. 588-608
    Abstract: Background: Glacial periods during the Pleistocene have been hypothesized to have greatly influenced geographical patterns of genetic structure and demography of many tropical species. The Glacial Refugium Hypothesis proposes that, during cold, dry glacial periods, populations of moisture-affinities tropical species were restricted to sheltered, humid areas and that, during warmer and more humid interglacial periods, these populations expanded. Some mountain regions in the tropics acted as refugia during the cold, dry periods of the Pleistocene for several temperate forest taxa, which recolonized the humid areas farther north during the interglacial periods. Questions: (1) Did Late Pleistocene-Holocene climate changes affect the historical demophraphy of Zamia prasina ? (2) Does the historical distribution of Zamia prasina agree with the Glacial Refugium Hypothesis? Study species: Zamia prasina W.Bull. (Zamiaceae), the only cycad native to the Yucatan Peninsula Biotic Province (YPBP). Methods: Five individuals were collected in 23 populations and characterized using two DNA regions: plastid atpF-atpH , and nuclear ITS2. Genetic diversity, phylogeographic structure, historical demography, and potential distributions were assessed.  Results: Our results showed moderately high genetic diversity and low, but significant, phylogeographic structure. Two genetic groups were identified, one in the eastern part of the Peninsula, the other in the western. The changes in historical demography suggest that Z. prasina experienced a population expansion following the warm conditions of the Holocene. Conclusions: The population dynamics of Zamia prasina are in accordance with the Glacial Refugium Hypothesis.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.2195
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2019
    detail.hit.zdb_id: 2679053-1
    SSG: 7,36
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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