{"id":16218,"date":"2025-06-26T11:05:09","date_gmt":"2025-06-26T14:05:09","guid":{"rendered":"https:\/\/www.ufrgs.br\/ppgbm\/?p=16218"},"modified":"2025-06-26T11:05:09","modified_gmt":"2025-06-26T14:05:09","slug":"30-06-seminario-de-qualificacao-sebastian-guzman-rodriguez","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ppgbm\/30-06-seminario-de-qualificacao-sebastian-guzman-rodriguez\/","title":{"rendered":"30\/06 &#8211; SEMIN\u00c1RIO DE QUALIFICA\u00c7\u00c3O &#8211; SEBASTI\u00c1N GUZM\u00c1N RODR\u00cdGUEZ"},"content":{"rendered":"<p><strong>SEMIN\u00c1RIO DE QUALIFICA\u00c7\u00c3O (Doutorado)<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>SEBASTI\u00c1N GUZM\u00c1N RODR\u00cdGUEZ<\/strong><\/p>\n<p><strong>The Center-Periphery Hypothesis Accounts for Most Genetic Diversity in a Widely Distributed Herbaceous Species<\/strong><\/p>\n<p>Orientadora: Dra. Loreta Brand\u00e3o de Freitas<\/p>\n<p>Banca examinadora: Dr. Pedro Henrique Pezzi (Universidade de Arkansas, EUA)) e Dr. Nelson J. Rosa Fagundes (PPGBM\/UFRGS)<\/p>\n<p>30 de junho de 2025 (segunda-feira)<\/p>\n<p><strong>10h30min<\/strong><\/p>\n<p>Sala virtual:\u00a0<a href=\"https:\/\/mconf.ufrgs.br\/webconf\/ppgbm\">https:\/\/mconf.ufrgs.br\/webconf\/ppgbm<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Observa\u00e7\u00e3o:<\/strong> Este semin\u00e1rio ser\u00e1 apresentado somente na modalidade virtual.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Abstract<\/strong><\/p>\n<p>In plants, lineage diversification is often driven by climatic oscillations, habitat fragmentation, and adaptive divergence, particularly in heterogeneous landscapes where species exhibit local adaptation. Spatial isolation can limit connectivity, while dispersal capacity plays a crucial role in modeling diversification through distribution. The center-periphery hypothesis helps explain the distribution and diversity of many plant species. In this work, we investigated the genetic diversity and population structure of <em>Petunia axillaris<\/em>, a widely distributed herbaceous species found throughout the Pampa ecosystem in Uruguay and southern Brazil. We based our analysis on DArT-derived single-nucleotide polymorphisms, aiming to address three central questions: 1) How is genetic diversity distributed throughout the species\u2019 range? 2) How does the previously described diversity in floral morphology relate to genome-wide diversity within the species\u2019 range? 3) What environmental factors contribute to adaptive divergence among populations, exemplifying CPH or local adaptation? Our results revealed that <em>P. axillaris<\/em> is divided into four main genetic clusters, which partially correspond to morphological diversity and follow a center-periphery distribution. Southern and central distributed populations display higher genetic diversity and preserve gene flow within each cluster, inhabiting stable and uniform areas. In contrast, populations at the northernmost and easternmost borders are differentiated, show lower diversity, and do not have gene flow between them or with other populations across the species\u2019 range. Potentially neutral and mainly outlier loci indicate local adaptation; taken together, our results support the center-periphery hypothesis as the best explanation for <em>P. axillaris<\/em> diversity.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Resumo<\/strong><\/p>\n<p>Em plantas, a diversifica\u00e7\u00e3o de linhagens \u00e9 frequentemente impulsionada por oscila\u00e7\u00f5es clim\u00e1ticas, fragmenta\u00e7\u00e3o de habitat e diverg\u00eancia adaptativa, particularmente em paisagens heterog\u00eaneas onde as esp\u00e9cies exibem adapta\u00e7\u00e3o local. O isolamento espacial pode limitar a conectividade, enquanto a capacidade de dispers\u00e3o desempenha um papel crucial na modelagem da diversifica\u00e7\u00e3o por meio da distribui\u00e7\u00e3o. A hip\u00f3tese centro-periferia ajuda a explicar a distribui\u00e7\u00e3o e a diversidade de muitas esp\u00e9cies de plantas. Neste trabalho, investigamos a diversidade gen\u00e9tica e a estrutura populacional de <em>Petunia axillaris<\/em>, uma esp\u00e9cie herb\u00e1cea amplamente distribu\u00edda por todo o ecossistema Pampa, no Uruguai e no sul do Brasil. Baseamos nossa an\u00e1lise em polimorfismos de nucleot\u00eddeo \u00fanico derivados de DArT-seq, visando responder tr\u00eas quest\u00f5es centrais: 1) Como a diversidade gen\u00e9tica est\u00e1 distribu\u00edda ao longo da distribui\u00e7\u00e3o geogr\u00e1fica da esp\u00e9cie? 2) Como a diversidade previamente descrita na morfologia floral se relaciona com a diversidade gen\u00f4mica dentro da \u00e1rea de distribui\u00e7\u00e3o da esp\u00e9cie? 3) Quais fatores ambientais contribuem para a diverg\u00eancia adaptativa entre popula\u00e7\u00f5es, exemplificando CPH ou adapta\u00e7\u00e3o local? Nossos resultados revelaram que <em>P. axillaris<\/em> est\u00e1 dividida em quatro grupos gen\u00e9ticos principais, que correspondem parcialmente \u00e0 diversidade morfol\u00f3gica e seguem uma distribui\u00e7\u00e3o centro-periferia. Popula\u00e7\u00f5es distribu\u00eddas ao sul e ao centro apresentam maior diversidade gen\u00e9tica e preservam o fluxo g\u00eanico dentro de cada grupo, habitando \u00e1reas est\u00e1veis e homog\u00eaneas. Em contraste, popula\u00e7\u00f5es nos extremos norte e leste da distribui\u00e7\u00e3o s\u00e3o diferenciadas, apresentam menor diversidade e n\u00e3o tem fluxo g\u00eanico entre si ou com outras popula\u00e7\u00f5es do restante da distribui\u00e7\u00e3o da esp\u00e9cie. Loci potencialmente neutros e principalmente os outliers indicaram adapta\u00e7\u00e3o local; em conjunto, nossos resultados corroboram a hip\u00f3tese centro-periferia como a melhor explica\u00e7\u00e3o para a diversidade de <em>P. axillaris<\/em>.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SEMIN\u00c1RIO DE QUALIFICA\u00c7\u00c3O (Doutorado) &nbsp; SEBASTI\u00c1N GUZM\u00c1N RODR\u00cdGUEZ The Center-Periphery Hypothesis Accounts for Most Genetic Diversity in a Widely Distributed Herbaceous Species Orientadora: Dra. Loreta Brand\u00e3o de Freitas Banca examinadora: [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":16219,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-16218","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seminarios-e-defesas"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/posts\/16218","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/comments?post=16218"}],"version-history":[{"count":1,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/posts\/16218\/revisions"}],"predecessor-version":[{"id":16220,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/posts\/16218\/revisions\/16220"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/media\/16219"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/media?parent=16218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/categories?post=16218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgbm\/wp-json\/wp\/v2\/tags?post=16218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}