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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Detalles Bibliográficos
Autores principales: Hunziker, J.H., Comas, C.
Formato: JOUR
Materias:
Cytogenetics
Larrea hybrids
Zygophyllaceae
cytogenetics
genome
hybridization
Larrea
Larrea ameghinoi
Larrea cuneifolia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00116793_v40_n1-4_p33_Hunziker
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00116793_v40_n1-4_p33_Hunziker
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spelling todo:paper_00116793_v40_n1-4_p33_Hunziker2023-10-03T14:10:03Z Larrea interspecific hybrids revisited (Zygophyllaceae) Hunziker, J.H. Comas, C. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
Hunziker, J.H.
Comas, C.
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.
format JOUR
author Hunziker, J.H.
Comas, C.
author_facet Hunziker, J.H.
Comas, C.
author_sort Hunziker, J.H.
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)
url http://hdl.handle.net/20.500.12110/paper_00116793_v40_n1-4_p33_Hunziker
work_keys_str_mv AT hunzikerjh larreainterspecifichybridsrevisitedzygophyllaceae
AT comasc larreainterspecifichybridsrevisitedzygophyllaceae
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