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Cytogenetic analyses in Paspalum L. reveal new diploid species and accessions Ciência Rural
Pozzobon,Marisa Toniolo; 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.
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome; Diploid; Polyploid; Ploidy level; Hybrid; Genetic resources.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000500014
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Failure of cytokinesis and 2n gamete formation in Brazilian accessions of Paspalum. Repositório Alice
PAGLIARINI, M. S.; TAKAYAMA, S. Y.; FREITAS, P. M.; CARRARO, L. R.; SAMOWSKI, E. V.; SILA, N.; BATISTA, L. A. R..
Cytological analysis on 112 Brazilian accessions of Paspalum showed that 52 were affected by failure of first or second cytokinesis during microsporogenesis. When the failure of cytokinesis occurred only in the first division and in the second division the cytokinesis was normal, a dyad of microspores was formed. In most of them the two cells remained binucleate, but in some a restitutional nucleus was observed. When the first division was normal and the failure of cytokinesis occurred only in the second division, dyads and triads were observed. A restitutional nucleus in one or both cells of the dyad, or in the binucleate cell of the triad was also observed. The percentage of dyads and triads varied among accessions, reaching 15.75 of the sporads in some....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cytikinesis; 2n gametes; Microsporogenesis; Paspalum; Polyploid.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/44723
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Meiotic behavior during microsporogenesis of Alchornea triplinervia (Sprengel) Müller Argoviensis Ciência Rural
Godoy,Sara Mataroli de; Pereira,Andréia Rodrigues Alonso; Romagnolo,Mariza Barion; Risso-Pascotto,Claudicéia.
The Alchornea triplinervia specie belongs to the Euphorbiaceae family, one of the main families of the Brazilian flora. In order to contribute to a better understanding of the specie, a counting of chromosome number and the microsporogenesis analysis of A. triplinervia were done. The inflorescences were collected in the municipalities of Paranavaí and Diamante do Norte, State of Paraná, Brazil, and the slides were prepared by squashing technique and staining with 1% acetic carmine. The analysis were performed using an optical microscope and showed a chromosome number for the specie equal to 2n=8x=72. Irregularities in the chromosome segregation process were the main meiotic abnormalities, presenting typical polyploid behavior. Other irregularities were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Euphorbiaceae; Chromosome number; 2n gametes; Meiosis; Polyploid.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000600012
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Morphological features of polyploidy populations of Astragalus adsurgens PALL. collected from the Loess Plateau in China and Hokkaido in Japan OAK
Hongo, Akio; Kita, Fumiji; Iwashita, kunihiro; Kudho, Makiko; 本江, 昭夫; 喜多, 富美治; 岩下, 有宏; 工藤, 麻紀子.
Palavras-chave: Astragalus adsurgens; Loess Plateau; Morphology; Polyploid; ムラサキモメンズル; 黄土高原; 形態; 倍数体.
Ano: 1996 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1357
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