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

Ciência Rural

Marisa Toniolo Pozzobon²  Ana Caroline De Carvalho Machado¹  Magdalena Vaio¹  José Francisco Montenegro Valls²  Andréa Del Pilar De Souza Peñaloza²  Sileuza Dos Santos²  Ana Luiza Côrtes¹  Gabriel Hugo Rua¹ 

[1] ,Embrapa Recursos Genéticos e Biotecnologia Parque Estação Biológica Brasília DF ,Brasil

关键词: chromosome;    diploid;    polyploid;    ploidy level;    hybrid;    genetic resources;    cromossomo;    diplóide;    poliplóide;    híbrido;    nível de ploidia;    recursos genéticos;   

DOI  :  10.1590/S0103-84782008000500014

来源: SciELO

【 摘 要 】

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.

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