| Revista: | Scientia agricola |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000359324 |
| ISSN: | 0103-9016 |
| Autors: | Veasey, Elizabeth Ann1 Bressan, Eduardo de Andrade2 Zucchi, Maria Imaculada3 Vencovsky, Roland1 Cardim, Daruska Cavalcante4 Silva, Rainerio Meireles da5 |
| Institucions: | 1Universidade de Sao Paulo, Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Sao Paulo. Brasil 2Universidade de Sao Paulo, Piracicaba, Sao Paulo. Brasil 3Empresa Brasileira de Pesquisa Agropecuaria, Polo Apta Centro Sul, Piracicaba, Sao Paulo. Brasil 4Servico Municipal de Saneamento Ambiental de Santo Andre, Santo Andre, Sao Paulo. Brasil 5Universidade Federal do Para, Centro Agropecuario, Altamira, Para. Brasil |
| Any: | 2011 |
| Període: | Jul-Ago |
| Volum: | 68 |
| Número: | 4 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | Studies on genetic diversity and genetic structure of natural populations are important in order to define strategies for in situ and ex situ conservation actions and for plant pre-breeding programs. Aiming to assess the genetic diversity and genetic structure of three wild American Oryza species with isozyme markers, 14 populations of the diploid O. glumaepatula (AglAgl), 11 populations of the tetraploid O. grandiglumis (CCDD) and five populations of the also tetraploid O. latifolia (CCDD) were studied. They were all originated from Rio Paraguay hydrographic basin and the Amazon. Four enzymes were used and they gave 40 polymorphic bands. The most polymorphic species was O. glumaepatula, followed by O. latifolia and O. grandiglumis. A cluster analysis with the Jaccard similarity coefficient separated the diploid from the two tetraploid species, and also the two tetraploid species. This separation was also evident on a scatter plot from a principal component analysis, suggesting that they should be treated as two separate species, although further studies are necessary to provide support for this affirmative. The AMOVA analyses showed a high intrapopulational variability for O. latifolia (67.6%) and O. grandiglumis (52.2%), when compared to their interpopulational variability (32.4% and 47.8%, respectively), which suggests the hypothesis of a higher degree of outcrossing events within these species. When studying the correlation between the Jaccard dissimilarity coefficient and geographic distances, a spatial genetic structure was observed for O. glumaepatula only. These results are important for defining strategies of both in situ and ex situ conservation |
| Disciplines | Agrociencias |
| Paraules clau: | Gramíneas, Genética, Arroz, Oryza glumaepatula, Oryza latifolia, Oryza grandiglumis, Plantas silvestres, Amazonas, Diversidad genética |
| Keyword: | Agricultural sciences, Gramineae, Genetics, Rice, Oryza glumaepatula, Oryza latifolia, Oryza grandiglumis, Wild plants, Amazon, Genetic diversity |
| Text complet: | Texto completo (Ver HTML) |
