Larrea interspecific hybrids revisited (Zygophyllaceae)
Evidence from recent molecular studies suggested a reappraisal of genome relationships between Larrea ameghinoi and the other South American species of the genus. As a consequence, new attemps to study the meiotic pairing of the L. ameghinoi x L. cuneifolia hybrids were undertaken (2n = 3x = 39). Me...
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2002
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v40_n1-4_p33_Hunziker http://hdl.handle.net/20.500.12110/paper_00116793_v40_n1-4_p33_Hunziker |
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paper:paper_00116793_v40_n1-4_p33_Hunziker2023-06-08T14:35:08Z Larrea interspecific hybrids revisited (Zygophyllaceae) Cytogenetics Larrea hybrids Zygophyllaceae cytogenetics genome hybridization Larrea Larrea ameghinoi Larrea cuneifolia Zygophyllaceae Evidence from recent molecular studies suggested a reappraisal of genome relationships between Larrea ameghinoi and the other South American species of the genus. As a consequence, new attemps to study the meiotic pairing of the L. ameghinoi x L. cuneifolia hybrids were undertaken (2n = 3x = 39). Mean number of bivalents and univalents were 9.8 and 19.4, respectively. Since the basic number x is 13, the interpretation that is favored is that L. ameghinoi (2n = 2x = 26) (AA) and L. cuneifolia (2n = 4x = 52) (DDCC) share partially homeologous genomes (A and C) that are involved in most bivalent pairing and this would explain the partial seed fertility of these triploid hybrids (15-19.4 %). L. ameghinoi genome (A) could have retained several parts of an ancestral genome which makes possible at least some pairing with those of the other species and enable it to function as a pivotal genome producing some fertility (from partial to complete) in all the possible hybrid combinations with its three South American congeners. An appendix is included with the captions of the figures of chapter 2 from the book edited by Mabry et al. (1977) which were erroneously omitted in the editorial and printing process. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v40_n1-4_p33_Hunziker http://hdl.handle.net/20.500.12110/paper_00116793_v40_n1-4_p33_Hunziker |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Cytogenetics Larrea hybrids Zygophyllaceae cytogenetics genome hybridization Larrea Larrea ameghinoi Larrea cuneifolia Zygophyllaceae |
spellingShingle |
Cytogenetics Larrea hybrids Zygophyllaceae cytogenetics genome hybridization Larrea Larrea ameghinoi Larrea cuneifolia Zygophyllaceae Larrea interspecific hybrids revisited (Zygophyllaceae) |
topic_facet |
Cytogenetics Larrea hybrids Zygophyllaceae cytogenetics genome hybridization Larrea Larrea ameghinoi Larrea cuneifolia Zygophyllaceae |
description |
Evidence from recent molecular studies suggested a reappraisal of genome relationships between Larrea ameghinoi and the other South American species of the genus. As a consequence, new attemps to study the meiotic pairing of the L. ameghinoi x L. cuneifolia hybrids were undertaken (2n = 3x = 39). Mean number of bivalents and univalents were 9.8 and 19.4, respectively. Since the basic number x is 13, the interpretation that is favored is that L. ameghinoi (2n = 2x = 26) (AA) and L. cuneifolia (2n = 4x = 52) (DDCC) share partially homeologous genomes (A and C) that are involved in most bivalent pairing and this would explain the partial seed fertility of these triploid hybrids (15-19.4 %). L. ameghinoi genome (A) could have retained several parts of an ancestral genome which makes possible at least some pairing with those of the other species and enable it to function as a pivotal genome producing some fertility (from partial to complete) in all the possible hybrid combinations with its three South American congeners. An appendix is included with the captions of the figures of chapter 2 from the book edited by Mabry et al. (1977) which were erroneously omitted in the editorial and printing process. |
title |
Larrea interspecific hybrids revisited (Zygophyllaceae) |
title_short |
Larrea interspecific hybrids revisited (Zygophyllaceae) |
title_full |
Larrea interspecific hybrids revisited (Zygophyllaceae) |
title_fullStr |
Larrea interspecific hybrids revisited (Zygophyllaceae) |
title_full_unstemmed |
Larrea interspecific hybrids revisited (Zygophyllaceae) |
title_sort |
larrea interspecific hybrids revisited (zygophyllaceae) |
publishDate |
2002 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v40_n1-4_p33_Hunziker http://hdl.handle.net/20.500.12110/paper_00116793_v40_n1-4_p33_Hunziker |
_version_ |
1768545955697655808 |