Hybridization and heterosis in the plicatula group of paspalum

Most forage cultivars released for thegenus Paspalum belong to a section named Plicatula.The species of Plicatula are mostly apomictic andconsequently the genetic diversity is locked for theirgeneticimprovement. The objectives were to evaluatethe crossability, hybrid fertility, heterosis, and geneti...

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Autores principales: Novo, Patricia Elda, Acuña, Carlos Alberto, Quarin, Camilo Luis, Urbani, Mario Hugo, Marcón, Florencia, Espinoza, Francisco
Formato: Artículo
Lenguaje:Inglés
Publicado: Springer 2022
Materias:
Polyploidy
Crossability
Genetic distance
Hybrid vigor
Seed fertility
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/47961
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-47961
record_format dspace
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 Polyploidy
Crossability
Genetic distance
Hybrid vigor
Seed fertility
spellingShingle Polyploidy
Crossability
Genetic distance
Hybrid vigor
Seed fertility
Novo, Patricia Elda
Acuña, Carlos Alberto
Quarin, Camilo Luis
Urbani, Mario Hugo
Marcón, Florencia
Espinoza, Francisco
Hybridization and heterosis in the plicatula group of paspalum
topic_facet Polyploidy
Crossability
Genetic distance
Hybrid vigor
Seed fertility
description Most forage cultivars released for thegenus Paspalum belong to a section named Plicatula.The species of Plicatula are mostly apomictic andconsequently the genetic diversity is locked for theirgeneticimprovement. The objectives were to evaluatethe crossability, hybrid fertility, heterosis, and genetic distances between apomictic accessions and asexual genotype of species of Plicatula group of Paspalum. Crosses were made using 22 apomictic tetraploid accessions belonging to 12 different species as pollen donors, and a sexual tetraploid genotype induced by colchicine from a sexual diploid accession of P. plicatulum. Crossability varied between 0 and 16% among crosses. Viable hybrid offspring were recovered from 15 out of 22 crosses. The most successful crosses involved P. guenoarum, P. plicatulum, P. chaseanum, and P. oteroi. Fertility of the sampled hybrids varied between 1.6% for the cross involving P. lenticulare, and 40.1% for an intraspecific cross (P. plicatulum, accession Hojs388). The genetic distance between parents was estimated using amplified fragment-length polymorphism, and it varied between 0.34 and 0.53. There was no correlation between genetic distances and crossability or fertility of the hybrids. Hybrids from the most numerous families were classified for mode of reproduction using flow cytometric seed analysis. The ratio between sexual and apomictic hybrids varied between 0.6:1 and 1.6:1. A selected group of apomictic hybrids were evaluated for several agronomic traits in the field. Heterosis was observed for frost tolerance and cattle preference. The results indicated that gene transfer via hybridization is possible among several species of Plicatula. Superior hybrids for specific traits can be generated and fixed by apomixis.
format Artículo
author Novo, Patricia Elda
Acuña, Carlos Alberto
Quarin, Camilo Luis
Urbani, Mario Hugo
Marcón, Florencia
Espinoza, Francisco
author_facet Novo, Patricia Elda
Acuña, Carlos Alberto
Quarin, Camilo Luis
Urbani, Mario Hugo
Marcón, Florencia
Espinoza, Francisco
author_sort Novo, Patricia Elda
title Hybridization and heterosis in the plicatula group of paspalum
title_short Hybridization and heterosis in the plicatula group of paspalum
title_full Hybridization and heterosis in the plicatula group of paspalum
title_fullStr Hybridization and heterosis in the plicatula group of paspalum
title_full_unstemmed Hybridization and heterosis in the plicatula group of paspalum
title_sort hybridization and heterosis in the plicatula group of paspalum
publisher Springer
publishDate 2022
url http://repositorio.unne.edu.ar/handle/123456789/47961
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