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Abstract Detail


Recent Topics Posters

Angulo-Perez, Diego [1], Sosa, Victoria [2].

Genetic and ecological differentiation in the North American desert shrub Berberis trifoliolata (Berberidaceae).

In heterogeneous landscapes, restriction of gene flow among populations can be caused by geographical barriers,isolation by distance, and non-vicariant factors when environmental conditions and selective regimes differ sufficiently between populations. In North America, The Sierra Madre Oriental with a complex topography and climatic fluctuations has been detected as one of these barriers. This mountain system harbors an elevated diversity of plants. Berberis trifoliolata, an abundant shrub from the Chihuahuan Desert and the Sierra Madre Oriental was selected to conduct phylogeographic research to understand the role of this mountain chain and climate differences in this North American desert in preventing gene flow. Plants of this shrubby species have trifoliolate leaves ending in spines, racemose inflorescences with showy yellow flowers and red edible fruits. The objectives of this research are to determine phylogeographic patterns in B. trifoliolata and to understand the role of mountain systems and/or climatic barriers in the genetic isolation among populations of B. trifoliolata. A total of 76 individuals of this species from 18 localities were collected. Total genomic DNA was isolated from silica-gel-dried leaf tissue using a modified CTAB. The chloroplast spacers trnH-psbA and rpl32-trnL(UAG) were amplified and sequenced. A statistical parsimony network (SPN) was obtained in TCS. Based in the results of the SPN, we selected four subregions in the total range of distribution of B.trifoliolata. Species distribution models were created in each subregion using MAXENT with bioclimatic variables. Twelve haplotypes were detected. Two haplotypes are shared in most populations, suggesting gene flow between populations. Private haplotypes are found at the ends of the distribution in the Purola preserve (Texas), Ojinaga (Chihuahua), Cerro El Potosi (Nuevo Leon),Guadalcazar (San Luis Potosi) and Ixmiquilpan (Hidalgo) populations.

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1 - Instituto De Ecologia, A.C., Biologia Evolutiva Km. 2.5 Antigua Careet, Km. 2.5 Antigua Carret. A Coatepec 351 Cong. El Haya Xalapa, Veracruz, N/A, 91070, Mexico
2 -

Keywords:
Sierra Madre Oriental
Chihuahuan Desert.

Presentation Type: Recent Topics Poster
Session: P
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM
Number: PRT024
Abstract ID:1317


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