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

• Autores: Marisa Toniolo Pozzobon, Ana Caroline de Carvalho Machado, Magdalena Vaio, José Francisco Montenegro Valls, Andréa del Pilar de Souza Peñaloza, Sileuza dos Santos, Ana Luiza Côrtes, Gabriel Hugo Rua
• Localización: Ciencia rural, ISSN 0103-8478, Vol. 38, Nº. 5, 2008, págs. 1292-1299
• Idioma: inglés
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• Resumen

  • 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