The breeding system of three Paspalum species with outstanding forage potential

Autores
Espinoza, Francisco; Urbani, Mario Hugo; Martínez, Eric Javier; Quarin, Camilo Luis
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Knowledge of the breeding system is a fundamental step in any program dealing with genetic improvement of wild grasses for forage purposes. This information is essential for Paspalum, a large genus with a variety of reproductive methods including apomixis. We conducted cytoembryological studies in 3 species of the group Plicatula (Paspalum limbatum, Paspalum lenticulare and Paspalum guenoarum) in order to understand the breeding systems of 9 accessions which are currently under selection and being bred for forage purposes in our institution. Both accessions of P. limbatum were diploid (2n = 2x = 20), showed bivalent chromosome pairing at meiosis and were allogamous due to self-incompatibility. Five accessions of P. lenticulare and 2 of P. guenoarum were tetraploid (2n = 4x = 40) with mainly bivalent and quadrivalent chromosome pairing at meiosis. The high frequency of quadrivalents suggests autoploidy as the most probable origin for these tetraploids. All these tetraploid accessions showed complete degeneration of the megaspores. The embryo sacs, one to several per ovule, always developed from somatic nucellar cells. These nonreduced embryo sacs produced embryos through parthenogenesis, and were hence genetically identical with the mother plant. Notwithstanding, pollination was required for the development of the endosperm. Only one accession of P. lenticulare has some reduced potential for sexual reproduction. Our results indicate that P. limbatum is a sexual allogamous diploid species while P. lenticulare and P. guenoarum reproduce by means of aposporous obligate apomixis.
Fil: Espinoza, Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Fil: Urbani, Mario Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Fil: Martínez, Eric Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Fil: Quarin, Camilo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Materia
Paspalum limbatum
Paspalum lenticulare
breeding system
Forage
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/30568
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/30568
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The breeding system of three Paspalum species with outstanding forage potentialEspinoza, FranciscoUrbani, Mario HugoMartínez, Eric JavierQuarin, Camilo LuisPaspalum limbatumPaspalum lenticularebreeding systemForagehttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Knowledge of the breeding system is a fundamental step in any program dealing with genetic improvement of wild grasses for forage purposes. This information is essential for Paspalum, a large genus with a variety of reproductive methods including apomixis. We conducted cytoembryological studies in 3 species of the group Plicatula (Paspalum limbatum, Paspalum lenticulare and Paspalum guenoarum) in order to understand the breeding systems of 9 accessions which are currently under selection and being bred for forage purposes in our institution. Both accessions of P. limbatum were diploid (2n = 2x = 20), showed bivalent chromosome pairing at meiosis and were allogamous due to self-incompatibility. Five accessions of P. lenticulare and 2 of P. guenoarum were tetraploid (2n = 4x = 40) with mainly bivalent and quadrivalent chromosome pairing at meiosis. The high frequency of quadrivalents suggests autoploidy as the most probable origin for these tetraploids. All these tetraploid accessions showed complete degeneration of the megaspores. The embryo sacs, one to several per ovule, always developed from somatic nucellar cells. These nonreduced embryo sacs produced embryos through parthenogenesis, and were hence genetically identical with the mother plant. Notwithstanding, pollination was required for the development of the endosperm. Only one accession of P. lenticulare has some reduced potential for sexual reproduction. Our results indicate that P. limbatum is a sexual allogamous diploid species while P. lenticulare and P. guenoarum reproduce by means of aposporous obligate apomixis.Fil: Espinoza, Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Urbani, Mario Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Martínez, Eric Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Quarin, Camilo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaTropical Grassland Soc Aust2001-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/30568Espinoza, Francisco; Urbani, Mario Hugo; Martínez, Eric Javier; Quarin, Camilo Luis; The breeding system of three Paspalum species with outstanding forage potential; Tropical Grassland Soc Aust; Tropical Grasslands; 35; 4; 12-2001; 211-2170049-47632346-3775CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.tropicalgrasslands.info/index.php/tgft/pages/view/tropicalGrasslandsinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:46:03Zoai:ri.conicet.gov.ar:11336/30568instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:46:03.52CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The breeding system of three Paspalum species with outstanding forage potential
title The breeding system of three Paspalum species with outstanding forage potential
spellingShingle The breeding system of three Paspalum species with outstanding forage potential
Espinoza, Francisco
Paspalum limbatum
Paspalum lenticulare
breeding system
Forage
title_short The breeding system of three Paspalum species with outstanding forage potential
title_full The breeding system of three Paspalum species with outstanding forage potential
title_fullStr The breeding system of three Paspalum species with outstanding forage potential
title_full_unstemmed The breeding system of three Paspalum species with outstanding forage potential
title_sort The breeding system of three Paspalum species with outstanding forage potential
dc.creator.none.fl_str_mv Espinoza, Francisco
Urbani, Mario Hugo
Martínez, Eric Javier
Quarin, Camilo Luis
author Espinoza, Francisco
author_facet Espinoza, Francisco
Urbani, Mario Hugo
Martínez, Eric Javier
Quarin, Camilo Luis
author_role author
author2 Urbani, Mario Hugo
Martínez, Eric Javier
Quarin, Camilo Luis
author2_role author
author
author
dc.subject.none.fl_str_mv Paspalum limbatum
Paspalum lenticulare
breeding system
Forage
topic Paspalum limbatum
Paspalum lenticulare
breeding system
Forage
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Knowledge of the breeding system is a fundamental step in any program dealing with genetic improvement of wild grasses for forage purposes. This information is essential for Paspalum, a large genus with a variety of reproductive methods including apomixis. We conducted cytoembryological studies in 3 species of the group Plicatula (Paspalum limbatum, Paspalum lenticulare and Paspalum guenoarum) in order to understand the breeding systems of 9 accessions which are currently under selection and being bred for forage purposes in our institution. Both accessions of P. limbatum were diploid (2n = 2x = 20), showed bivalent chromosome pairing at meiosis and were allogamous due to self-incompatibility. Five accessions of P. lenticulare and 2 of P. guenoarum were tetraploid (2n = 4x = 40) with mainly bivalent and quadrivalent chromosome pairing at meiosis. The high frequency of quadrivalents suggests autoploidy as the most probable origin for these tetraploids. All these tetraploid accessions showed complete degeneration of the megaspores. The embryo sacs, one to several per ovule, always developed from somatic nucellar cells. These nonreduced embryo sacs produced embryos through parthenogenesis, and were hence genetically identical with the mother plant. Notwithstanding, pollination was required for the development of the endosperm. Only one accession of P. lenticulare has some reduced potential for sexual reproduction. Our results indicate that P. limbatum is a sexual allogamous diploid species while P. lenticulare and P. guenoarum reproduce by means of aposporous obligate apomixis.
Fil: Espinoza, Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Fil: Urbani, Mario Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Fil: Martínez, Eric Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
Fil: Quarin, Camilo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
description Knowledge of the breeding system is a fundamental step in any program dealing with genetic improvement of wild grasses for forage purposes. This information is essential for Paspalum, a large genus with a variety of reproductive methods including apomixis. We conducted cytoembryological studies in 3 species of the group Plicatula (Paspalum limbatum, Paspalum lenticulare and Paspalum guenoarum) in order to understand the breeding systems of 9 accessions which are currently under selection and being bred for forage purposes in our institution. Both accessions of P. limbatum were diploid (2n = 2x = 20), showed bivalent chromosome pairing at meiosis and were allogamous due to self-incompatibility. Five accessions of P. lenticulare and 2 of P. guenoarum were tetraploid (2n = 4x = 40) with mainly bivalent and quadrivalent chromosome pairing at meiosis. The high frequency of quadrivalents suggests autoploidy as the most probable origin for these tetraploids. All these tetraploid accessions showed complete degeneration of the megaspores. The embryo sacs, one to several per ovule, always developed from somatic nucellar cells. These nonreduced embryo sacs produced embryos through parthenogenesis, and were hence genetically identical with the mother plant. Notwithstanding, pollination was required for the development of the endosperm. Only one accession of P. lenticulare has some reduced potential for sexual reproduction. Our results indicate that P. limbatum is a sexual allogamous diploid species while P. lenticulare and P. guenoarum reproduce by means of aposporous obligate apomixis.
publishDate 2001
dc.date.none.fl_str_mv 2001-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/30568
Espinoza, Francisco; Urbani, Mario Hugo; Martínez, Eric Javier; Quarin, Camilo Luis; The breeding system of three Paspalum species with outstanding forage potential; Tropical Grassland Soc Aust; Tropical Grasslands; 35; 4; 12-2001; 211-217
0049-4763
2346-3775
CONICET Digital
CONICET
url http://hdl.handle.net/11336/30568
identifier_str_mv Espinoza, Francisco; Urbani, Mario Hugo; Martínez, Eric Javier; Quarin, Camilo Luis; The breeding system of three Paspalum species with outstanding forage potential; Tropical Grassland Soc Aust; Tropical Grasslands; 35; 4; 12-2001; 211-217
0049-4763
2346-3775
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.tropicalgrasslands.info/index.php/tgft/pages/view/tropicalGrasslands
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Tropical Grassland Soc Aust
publisher.none.fl_str_mv Tropical Grassland Soc Aust
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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