Cytogenetic analyses in Paspalum L. reveal new diploid species and accessions

• Autor(a) principal: Pozzobon,Marisa Toniolo
• Data de Publicação: 2008
• Outros Autores: Machado,Ana Caroline de Carvalho, Vaio,Magdalena, Valls,José Francisco Montenegro, Peñaloza,Andréa del Pilar de Souza, Santos,Sileuza dos, Côrtes,Ana Luiza, Rua,Gabriel Hugo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Ciência Rural
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000500014
• topic: chromosome; diploid; polyploid; ploidy level; hybrid; genetic resources

Chromosome numbers were counted in 126 new accessions of 50 Paspalum species from Brazil, Argentina, Paraguay and Bolivia. The chromosome numbers 2n=12, 20, 24, 30, 40, 50, 60, 80 were confirmed. Chromosome numbers for P. arenarium (2n=20), P. barretoi (2n=20), P. aff. ceresia (2n=40), P. corcovadense (2n=20), P. crispulum (2n=20), P. flaccidum (2n=40), P. nummularium (2n=20), P. scalare (2n=20), P. vescum (2n=20) and P. rectum (2n=20) and a diploid cytotype of P. malacophyllum are reported for the first time. The predominance of tetraploid accessions (43.6%) was confirmed, but an unusually high number of diploid species (44%) and accessions (35.7%) was found. These results open new perspectives for breeding programs, phylogenetic studies, and for research on apomixis control, since diploids of Paspalum are typically sexual.