Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids

The aim of this study was to analyse phenotype and cytogenetic behaviour of <i>Zea mays</i> ssp. <i>mays</i> and <i>Zea mays</i> ssp. <i>parviglumis</i> (Zpa) hybrids with different ploidy levels. Maize 2n=20 (Zm20) and Zpa hybrid plants (MPa20) were o...

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Detalles Bibliográficos
Autores principales: Molina, María del Carmen, García, María Dina
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Agrarias
Colchicine
Embryo rescue
Genomic formulae
Incompatible crosses
Maize hybrids
Ploidy level
Somatic embryogenesis
Zea
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84380
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84380
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Agrarias
Colchicine
Embryo rescue
Genomic formulae
Incompatible crosses
Maize hybrids
Ploidy level
Somatic embryogenesis
Zea
spellingShingle Ciencias Agrarias
Colchicine
Embryo rescue
Genomic formulae
Incompatible crosses
Maize hybrids
Ploidy level
Somatic embryogenesis
Zea
Molina, María del Carmen
García, María Dina
Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids
topic_facet Ciencias Agrarias
Colchicine
Embryo rescue
Genomic formulae
Incompatible crosses
Maize hybrids
Ploidy level
Somatic embryogenesis
Zea
description The aim of this study was to analyse phenotype and cytogenetic behaviour of <i>Zea mays</i> ssp. <i>mays</i> and <i>Zea mays</i> ssp. <i>parviglumis</i> (Zpa) hybrids with different ploidy levels. Maize 2n=20 (Zm20) and Zpa hybrid plants (MPa20) were obtained naturally, they showed regular meiosis and fertile progeny (+80%). Otherwise, maize 2n=40 (Zm40) and Zpa hybrids (MPa30) were obtained by embryo rescue, they showed irregular meiosis and sterile progeny (0-8%). Meiotic configurations more frequently observed in the species and the hybrids were: Zm20 (10II); Zm40 (3.24II+8.34IV); Zpa (0.46I+9.76II); MPa20 (0.40I+9.54II+0.05III+0.65IV); MPa30 (5.97I+5.93II+4.05III). After colchicine treatment the number of IV increased in Zm20, Zpa and MPa20 and 10III were observed MPa30, because of homoeologous chromosomes pairing. In conclusion, Zm20 (AmAm BmBm) and Zpa (ApaApa BpaBpa) are allotetraploids with 2 homoeologous genomes. Whilst in the hybrids, the homoeologous genomes A pair in all cases, genomes B only do if their homologous competing during pairing, does not exist except in colchicine-treated plants which also show homoeologous genomes B pairing.
format Articulo
Articulo
author Molina, María del Carmen
García, María Dina
author_facet Molina, María del Carmen
García, María Dina
author_sort Molina, María del Carmen
title Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids
title_short Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids
title_full Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids
title_fullStr Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids
title_full_unstemmed Ploidy levels affect phenotype and cytogenetic traits in Zea mays ssp. mays (2n=20 or 40) and Zea mays ssp. parviglumis hybrids
title_sort ploidy levels affect phenotype and cytogenetic traits in zea mays ssp. mays (2n=20 or 40) and zea mays ssp. parviglumis hybrids
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/84380
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bdutipo_str Repositorios
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