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metadata.dc.type: Artigo de Periódico
Issue Date: Aug-2011
metadata.dc.creator: VEASEY, Elizabeth Ann
BRESSAN, Eduardo de Andrade
ZUCCHI, Maria Imaculada
CARDIM, Daruska Cavalcante
SILVA, Rainério Meireles da
metadata.dc.description.affiliation: SILVA, R. M. Universidade Federal do Pará
Title: Genetic diversity of American wild rice species
Citation: VEASEY, Elizabeth Ann et al. Genetic diversity of American wild rice species. Scientia Agricola, Piracicaba, SP, v. 68, n. 4, p. 440-446, jul./ago. 2011. Disponível em: <>. Acesso em:.
Abstract: 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.
Keywords: Genética vegetal
Arroz selvagem
Oryza glumaepatula
Oryza latifolia
Oryza grandiglumis
Series/Report no.: Scientia Agricola
ISSN: 1678-992X Brasil
Publisher: Universidade Federal do Pará
metadata.dc.publisher.initials: UFPA
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - CALTA

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