Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants
Basic findings from classical genetic studies are available for exploiting apomixis in the breeding of several forage grass genera. Most Paspalum species are multi- ploid with a sexual diploid cytotype and conspecific apomictic polyploid (mainly tetraploid) cytotypes. Experimental tetraploidi...
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| Formato: | Artículo |
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Crop Science Society of America
2024
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| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/53136 |
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I48-R184-123456789-531362024-03-14T23:04:20Z Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants Novo, Patricia Elda Acuña, Carlos Alberto Urbani, Mario Hugo Galdeano, Florencia Espinoza, Francisco Quarin, Camilo Luis Paspalum Apomixis Sexual plants Basic findings from classical genetic studies are available for exploiting apomixis in the breeding of several forage grass genera. Most Paspalum species are multi- ploid with a sexual diploid cytotype and conspecific apomictic polyploid (mainly tetraploid) cytotypes. Experimental tetraploidized diploids reproduce sexually and, when crossed with natural apomictic tetraploids, yield hybrid populations that segregate for reproductive mode. Genetic studies indicated that apomixis is inherited as a monogenic dominant factor. We recombined 50 selected sexual hybrids obtained from crosses between a tetraploidized sexual genotype of P. plicatulum and 9 natural apomictic tetraploid accessions of 6 species of the Plicatula group. A synthetic sexual tetraploid population (SSTP) of 600 individuals from mixed seed of the 50 intercrossed hybrids was space-planted in the field. Based on evaluations of plant vigor, seed set, ergot tolerance, regrowth after flowering, and cold tolerance, 31 plants were selected. Crosses between most selected plants and two testers, which belonged to P. guenoarum, were performed, and the generated progeny was planted into the field following a randomized block design with 3 replications. The progeny test was evaluated for seed fertility, biomass yield, and cold tolerance. This procedure allowed selection of 10 elite plants from the SSTP. These plants should contain genes recombined from six apomictic species, without the genetic determinants for apomixis. They may be polycrossed to generate an improved sexual population, or crossed with other apomictic genotypes to obtain improved apomictic hybrids. 2024-03-14T11:52:59Z 2024-03-14T11:52:59Z 2020 Artículo Novo, Patricia Elda, et al., 2020. Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants. Crop Science. Baltimore: Crop Science Society of America, vol. 60, no. 4, p. 1-11. E-ISSN 1435-0653. 0011-183X http://repositorio.unne.edu.ar/handle/123456789/53136 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 1-11 application/pdf Crop Science Society of America Crop Science, 2020, vol. 60. no. 4, p. 1-11. |
| 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 |
Paspalum Apomixis Sexual plants |
| spellingShingle |
Paspalum Apomixis Sexual plants Novo, Patricia Elda Acuña, Carlos Alberto Urbani, Mario Hugo Galdeano, Florencia Espinoza, Francisco Quarin, Camilo Luis Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| topic_facet |
Paspalum Apomixis Sexual plants |
| description |
Basic findings from classical genetic studies are available for exploiting apomixis
in the breeding of several forage grass genera. Most Paspalum species are multi-
ploid with a sexual diploid cytotype and conspecific apomictic polyploid (mainly
tetraploid) cytotypes. Experimental tetraploidized diploids reproduce sexually and,
when crossed with natural apomictic tetraploids, yield hybrid populations that
segregate for reproductive mode. Genetic studies indicated that apomixis is inherited
as a monogenic dominant factor. We recombined 50 selected sexual hybrids obtained
from crosses between a tetraploidized sexual genotype of P. plicatulum and 9 natural
apomictic tetraploid accessions of 6 species of the Plicatula group. A synthetic
sexual tetraploid population (SSTP) of 600 individuals from mixed seed of the 50
intercrossed hybrids was space-planted in the field. Based on evaluations of plant
vigor, seed set, ergot tolerance, regrowth after flowering, and cold tolerance, 31
plants were selected. Crosses between most selected plants and two testers, which
belonged to P. guenoarum, were performed, and the generated progeny was planted
into the field following a randomized block design with 3 replications. The progeny
test was evaluated for seed fertility, biomass yield, and cold tolerance. This procedure
allowed selection of 10 elite plants from the SSTP. These plants should contain
genes recombined from six apomictic species, without the genetic determinants for
apomixis. They may be polycrossed to generate an improved sexual population, or
crossed with other apomictic genotypes to obtain improved apomictic hybrids. |
| format |
Artículo |
| author |
Novo, Patricia Elda Acuña, Carlos Alberto Urbani, Mario Hugo Galdeano, Florencia Espinoza, Francisco Quarin, Camilo Luis |
| author_facet |
Novo, Patricia Elda Acuña, Carlos Alberto Urbani, Mario Hugo Galdeano, Florencia Espinoza, Francisco Quarin, Camilo Luis |
| author_sort |
Novo, Patricia Elda |
| title |
Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| title_short |
Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| title_full |
Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| title_fullStr |
Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| title_full_unstemmed |
Genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| title_sort |
genetic transfer from several apomictic tetraploid paspalum species to an elite group of sexual plants |
| publisher |
Crop Science Society of America |
| publishDate |
2024 |
| url |
http://repositorio.unne.edu.ar/handle/123456789/53136 |
| work_keys_str_mv |
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