Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids

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-generatio...

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Autores principales: Acuña, Carlos Alberto, Blount, Ann R., Quesenberry, Kenneth H., Kenworthy, Kevin E., Hanna, Wayne W.
Formato: Artículo
Lenguaje:Inglés
Publicado: Springer Nature 2025
Materias:
Apomixis
Heterosis
Paspalum
Polyploidy
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/59338
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-59338
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spelling I48-R184-123456789-593382025-12-15T12:00:00Z 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. Apomixis Heterosis Paspalum Polyploidy 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. 2025-12-15T11:29:21Z 2025-12-15T11:29:21Z 2010 Artículo Acuña, Carlos Alberto, et al., 2010. Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids. Euphytica. Alemania: Springer Nature, vol. 179, p. 227-235. E-ISSN 1573-5060. 0014-2336 http://repositorio.unne.edu.ar/handle/123456789/59338 eng https://link.springer.com/article/10.1007/s10681-010-0276-y closedAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 227-235 application/pdf Springer Nature Euphytica, 2011, vol. 179, p. 227-235.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Apomixis
Heterosis
Paspalum
Polyploidy
spellingShingle Apomixis
Heterosis
Paspalum
Polyploidy
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
topic_facet Apomixis
Heterosis
Paspalum
Polyploidy
description 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.
format Artículo
author Acuña, Carlos Alberto
Blount, Ann R.
Quesenberry, Kenneth H.
Kenworthy, Kevin E.
Hanna, Wayne W.
author_facet Acuña, Carlos Alberto
Blount, Ann R.
Quesenberry, Kenneth H.
Kenworthy, Kevin E.
Hanna, Wayne W.
author_sort Acuña, Carlos Alberto
title Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
title_short Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
title_full Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
title_fullStr Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
title_full_unstemmed Tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
title_sort tetraploid bahiagrass hybrids : breeding technique, genetic variability and proportion of heterotic hybrids
publisher Springer Nature
publishDate 2025
url http://repositorio.unne.edu.ar/handle/123456789/59338
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AT kenworthykevine tetraploidbahiagrasshybridsbreedingtechniquegeneticvariabilityandproportionofheterotichybrids
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