INVESTIGADORES
HONFI Ana Isabel
artículos
Título:
Interspecific hybrids between Paspalum plicatulum and grama-tio-pedro (P. oteroi): a key tool for forage breeding
Autor/es:
NOVO PATRICIA; VALLS J.F.M.; GALDEANO F.; HONFI ANA I.; ESPINOZA FRANCISCO; QUARIN CAMILO L.
Revista:
SCIENTIA AGRICOLA
Editorial:
UNIV SAO PAOLO
Referencias:
Lugar: Piracicaba; Año: 2016 vol. 73 p. 356 - 362
ISSN:
0103-9016
Resumen:
Grama-tio-pedro (Paspalum oteroi Swallen) is a rare stoloniferous grass of the Plicatula group of Paspalum, well adapted to continuous grazing in areas subject to seasonal flooding in the Pantanal region, in central western Brazil. The species is a facultative apomictic (asexual reproduction by seed) tetraploid, sporadically cultivated in Pantanal farms, either propagated by cuttings or seed. Due to its potential for extensive cultivation and its forage quality, it appears as a good candidate for genetic improvement within the Plicatula group through plant breeding. Taking advantage of a colchicine-induced sexual autotetraploid genotype of P. plicatulum Michx. we obtained interspecific hybrids by using the apomictic species, P. oteroi, as pollen donor. The very similar meiotic chromosome behavior observed in both parents, with mainly quadrivalent and bivalent associations, suggested that P. oteroi is a natural autotetraploid. The hybrids showed less irregular meiotic behavior with fewer quadrivalents and more bivalents than either parent. The fertility among interspecifichybrids varied from complete sterility in some of them, to seed productions in others that were approximately twice as much as for either parent. The great variability of seed set performance may well be a drastic genetic consequence of joining two homologous chromosome sets of P. plicatulum together with two homologous sets of P. oteroi which in turn have some homeology between them. Because most hybrids reproduce by mean of sexuality, they could be used as female parents in backcrosses and in crosses with other species of the Plicatula group for interspecific gene transferring in breeding programs.