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  • 1
    Electronic Resource
    Electronic Resource
    Chromosome number in germplasm accessions of Paspalum (Plicatula group) from different regions in Brazil (1998)
    Springer
    Euphytica 99 (1998), S. 89-94 
    Details
    ISSN: 1573-5060
    Keywords: Paspalum ; Brazilian accessions ; chromosome number ; polyploidy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract We determined the chromosome number of 52 accessions of Paspalum from the germplasm collection of the Centro de Pesquisa de Pecuária do Sudeste (CPPSE/EMBRAPA) originating from different regions in Brazil. All accessions belonged to the Plicatula group, 13 of them being P. plicatulum, three P. guenoarum, two P. yaguaronense, two P. compressifolium, one P. atratum, and 31 still unidentified Paspalum sp. Except for a P. yaguaronense accession that presented 2n=60, all the remaining ones presented 2n=40 chromosomes. This is the first report of the chromosome number of P. atratum. Considering that the basic number for most species in the genus Paspalum is ×=10, the accessions analyzed are tetraploids (2n=4×=40) and hexaploids (2n=6×=60).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018336200053
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  • 2
    Electronic Resource
    Electronic Resource
    Failure of cytokinesis and 2n gamete formation in Brazilian accessions of Paspalum (1999)
    Springer
    Euphytica 108 (1999), S. 129-135 
    Details
    ISSN: 1573-5060
    Keywords: cytokinesis ; 2n gametes ; microsporogenesis ; Paspalum ; polyploid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract 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. The absence of cytokinesis indicates the possibility that the widespread occurrence of polyploidy in the genus Paspalum originates from 2n pollen grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003660327223
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    Paper (German National Licenses)
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