Artículo
Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
Acuña, Carlos Alberto
; Blount, Ann R.; Quesenberry, Kenneth H.; Kenworthy, Kevin E.; Hanna, Wayne W.
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Fecha de publicación:
05/2011
Editorial:
Springer
Revista:
Euphytica
ISSN:
0014-2336
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Manipulating apomixis for fixing tetraploid bahiagrass (Paspalum notatum Flüggé) hybrids exhibiting superior agronomic characteristics would be a valuable tool for the genetic improvement of this species. The objectives were to create a second generation of hybrids by crossing sexual first-generation tetraploid hybrids (FGTH) and unrelated apomictic FGTH or ecotypes, determine the segregation for mode of reproduction, and estimate the resulting genetic variation and heterosis for several agronomic characteristics. The segregation for mode of reproduction was analyzed using mature embryo sac observations. Field measurements and visual ratings were used to evaluate the growth habit, production of inflorescences, cool-season growth and freeze resistance of hybrids. A ratio of 4.6:1 between sexual and apomictic hybrids was observed. Only 3% of the progeny was classified as highly apomictic. The low proportion of highly apomictic progeny restricts the feasibility of this breeding approach. Large genetic variation was observed among hybrids for growth habit, cool-season growth and freeze resistance. The proportion of hybrids exhibiting heterosis was high for plant height, cool-season growth, and freeze resistance. The tetraploid bahiagrass germplasm contains a large diversity for traits of agronomic importance that can be exploited for the genetic improvement of this species.
Palabras clave:
APOMIXIS
,
HETEROSIS
,
PASPALUM
,
POLYPLOIDY
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - NORDESTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - NORDESTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - NORDESTE
Articulos(IBONE)
Articulos de INST.DE BOTANICA DEL NORDESTE (I)
Articulos de INST.DE BOTANICA DEL NORDESTE (I)
Citación
Acuña, Carlos Alberto; Blount, Ann R.; Quesenberry, Kenneth H.; Kenworthy, Kevin E.; Hanna, Wayne W.; Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids; Springer; Euphytica; 179; 2; 5-2011; 227-235
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