Full text in pdf format
Chromosome number in germplasm accessions of Paspalum notatum (Gramineae)
Marisa T. Pozzobon; José Francisco M. Valls
Centro Nacional de Pesquisa de Recursos Genéticos e Biotecnologia, CENARGEN/EMBRAPA, Caixa Postal 02372, 70770-900 Brasília, DF, Brasil. J.F.M.V. is the recipient of a CNPq fellowship. Send correspondence to M.T.P.
ABSTRACT
Chromosome numbers are reported for 127 germplasm accessions of Paspalum notatum maintained by EMBRAPA (Empresa Brasileira de Pesquisa Agropecuária) in two research centers in Brazil. Most accessions were collected in their natural habitats in Southern Brazil.
Tetraploidy (2n = 40 chromosomes) was predominant (91% of the accessions studied), confirming previous reports for the species. Eleven accessions with 2n = 20 chromosomes, although collected in the wild, are possibly derived from 'Pensacola' bahiagrass, commonly cultivated in the area since its introduction from the United States in the 60's, for the establishment of permanent pastures.
Keywords: germplasm; Gramineae; Chromosome number.
REFERENCES
Barreto, I.L. (1974). 0 gênero Paspalum (Gramineae) no Rio Grande do Sul. Livre Docência thesis, Departamento de Fitotecnia da Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS.
Bashaw, E.C., Hovin, A.W. and Holt, E.C. (1970). Apomixis, its evolutionary significance and utilization in plant breeding. In: Proceedings of the 11th International Grassland Congress (Norman, M.J.T., ed.). University of Queensland Press, St. Lucia, pp. 245-248.
Burson, B.L., Lee, H. and Bennett, H.W. (1973). Genome relations between tetraploid Paspalum dilatatum and four diploid Paspalum species. Crop Sci. 13: 739-743.
Burton, G.W. (1940). A cytological study of some species in the genus Paspalum. J. Agric. Res. 60: 193-197.
Burton, G.W. (1948). The method of reproduction in common Bahiagrass, Paspalum notatum. J. Amer. Soc. Agron. 40: 443-452.
Burton, G.W. (1955). Breeding Pensacola bahiagrass, Paspalum notatum. I. Method of reproduction. Agron. J. 47: 311-314.
Burton, G.W. (1967). A search for the origin of Pensacola Bahiagrass. Econ. Bot. 21: 379-382.
Burton, G.W. (1990). Enhancing germplasrn with mass selection. In: Advances in New Crops (Janick, J. and Simon, J.E., eds.). Timber Press, Portland, pp. 99-100.
Fernandes, M.I.B.M., Barreto, I.L., Salzano, F.M. and Sacchet, A.M.O.F. (1974). Cytological and evolutionary relationships in Brazilian forms of Paspalum (Gramineae). Garyologia 27: 455-465.
Forbes Jr., I. and Burton, G.W. (1961). Cytology of diploids, natural and induced tetraploids, and intraspecific hybrids of Bahiagrass, Paspalum notatum FLOGGE. Crop. Sci. 1: 402-406.
Gould, F.W. (1966). Chromosome numbers of Mexican grasses. Can. J. Bot. 44: 1683-1696.
Honfi, A.., Quarín, C.L. and Balls, J.F.M. (1990). Estudios cariológicos en gramineas sudamericanas. Darwiniana 30: 87-94.
Parodi, L.R. (1937). Contribución al estudio de ias gramíneas del género Paspalum de la flora uruguaya. Revista del Museo de La Plata, N.S., Bot. 1: 211-250.
Quarín, C.L. and Burson, B.L. (1983). Cytogenetic relations among Paspalum not atum var. saurae, P. pumilum, P. indecorum and P. vaginatum. Bot. Gaz. 144: 433-438.
Quarín, C.L., Burson, B.. and Burton, G.W. (1984). Cytology of intra- and interspecific hybrids between two cytotypes of Paspalum notatum and P. cromyorrhizon. Bot. Gaz. 145: 420-426.
Saura, F. (1948). Cariología de gramíneas en Argentina. Rev. Fac. Agron. Vet. Buenos Aires 12: 51-67.
Urbani, M.H. (1987). Mejoramiento genético de una especie apomítica: P. notatum. In: Encontro Internacional sobre Melhoramento Genético de Paspalum (Anais). Nova Odessa, SP, pp. 67-68.
Valls, J.F.M. and Pozzobon, M.T. (1987). Variação apresentada pelos principais grupos taxonômicos de Paspalum com interesse forrageiro no Brasil. In: Encontro Internacional sobre Melhoramento Genético de Paspalum (Anais). Nova Odessa, SP, pp. 15-21.