| Journal: | Genetics and molecular biology |
| Database: | PERIÓDICA |
| System number: | 000418149 |
| ISSN: | 1415-4757 |
| Authors: | Burchardt, Paula1 Souza-Chies, Tatiana T2 Chauveau, Olivier3 Callegari Jacques, Sidia Maria4 Brisolara-Correa, Lauis1 Inacio, Camila Dellanhese3 Eggers, Lilian3 Siljak-Yakovlev, Sonja5 Campos, Jose Marcello Salabert de6 Kaltchuk-Santos, Eliane7 |
| Institutions: | 1Universidade Federal do Rio Grande do Sul, Programa de Pos-Graduacao em Genetica e Biologia Molecular, Porto Alegre, Rio Grande do Sul. Brasil 2Universidade Federal do Rio Grande do Sul, Instituto de Biociencias, Porto Alegre, Rio Grande do Sul. Brasil 3Universidade Federal do Rio Grande do Sul, Programa de Pos-Graduacao em Botanica, Porto Alegre, Rio Grande do Sul. Brasil 4Universidade Federal do Rio Grande do Sul, Instituto de Matematica e Estatistica, Porto Alegre, Rio Grande do Sul. Brasil 5Universite Paris-Sud, Ecologie, Systematique et Evolution, Orsay, Paris. Francia 6Universidade Federal de Juiz de Fora, Instituto de Ciencias Biologicas, Juiz de Fora, Minas Gerais. Brasil 7Universidade Federal do Rio Grande do Sul, Departamento de Genetica, Porto Alegre, Rio Grande do Sul. Brasil |
| Year: | 2018 |
| Volumen: | 41 |
| Pages: | 288-307 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | Sisyrinchium is the largest genus of Iridaceae in the Americas and has the greatest amount of cytological data avail- able. This study aimed at investigating how genomes evolved in this genus. Chromosome number, genome size and altitude from species of sect. Viperella were analyzed in a phylogenetic context. Meiotic and pollen analyses were performed to assess reproductive success of natural populations, especially from those polyploid taxa. Character optimizations revealed that the common ancestor of sect. Viperella was probably diploid (2 n =2 x =18) with two sub - sequent polyplodization events. Total DNA content (2C) varied considerably across the phylogeny with larger genomes detected mainly in polyploid species . Altitude also varied across the phylogeny, however no significant re - lationship was found between DNA content changes and altitude in our data set. All taxa presented regular meiosis and pollen viability (> 87%), except for S. sp. nov. aff. alatum (22.70%), suggesting a recent hybrid origin. Chromo - some number is mostly constant within this section and polyploidy is the only source of modification. Although 2C varied considerably among the 20 taxa investigated, the diversity observed cannot be attributed only to polyploidy events because large variations of DNA content were also observed among diploids |
| Disciplines: | Biología |
| Keyword: | Biología celular, Genética, Evolución y filogenia, Número cromosómico, Contenido de ADN, Comportamiento meiótico, Viabilidad del polen, Poliploidía |
| Keyword: | Cell biology, Genetics, Evolution and phylogeny, Chromosome number, DNA content, Meiotic behavior, Pollen viability, Polyploidy |
| Full text: | Texto completo (Ver PDF) |
