Mode of reproduction and meiotic chromosome behavior in acroceras macrum

Acroceras macrum Stapf is a high-quality C3 grass species adapted to the subtropics. It is a valuable forage resource in frequently flooded environments. The objectives were to analyze the type of polyploidy, mode of reproduction, and estimate seed and pollen fertility. A living collection of 22 tet...

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Autores principales: Ferrari Usandizaga, Silvana Consuelo, Martínez, Eric Javier, Schedler, Mara, Honfi, Ana Isabel, Acuña, Carlos Alberto
Formato: Artículo
Lenguaje:Inglés
Publicado: Crop Science Society of America 2025
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/59377
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RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
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spelling I48-R184-123456789-593772025-12-15T12:04:27Z Mode of reproduction and meiotic chromosome behavior in acroceras macrum Ferrari Usandizaga, Silvana Consuelo Martínez, Eric Javier Schedler, Mara Honfi, Ana Isabel Acuña, Carlos Alberto Acroceras macrum Stapf is a high-quality C3 grass species adapted to the subtropics. It is a valuable forage resource in frequently flooded environments. The objectives were to analyze the type of polyploidy, mode of reproduction, and estimate seed and pollen fertility. A living collection of 22 tetraploid and five hexaploid genotypes of A. macrum was analyzed. Type of polyploidy was analyzed from chromosomal pairing at diakinesis and prometaphase I, and meiotic irregularities were evaluated during the microsporogenesis. Pollen viability was also examined. Bivalents predominated in tetraploids and trivalents in hexaploids. Meiotic abnormalities were more frequent in hexaploids than in tetraploids, and they were mainly related to mechanisms of chromosome nondisjunction. The reproductive mode was determined by cytological analysis of megasporogenesis and megagametogenesis, seed fertility under different pollination methods, and molecular progeny tests. In both tetraploid and hexaploid races, only the development of single meiotically derived embryo sacs was observed. Greater seed production in outcrossing compared with selfing indicated a primarily allogamous matting system. Progenies from crosses between genetically different tetraploid genotypes amplified male-specific molecular markers, indicating a hybrid origin and solid evidence of sexual reproduction. Population breeding approaches developed for sexual cross-pollinated species are suited for improving A. macrum. 2025-12-15T11:33:37Z 2025-12-15T11:33:37Z 2020-01 Artículo Ferrari Usandizaga, Silvana Consuelo, et al., 2020. Mode of reproduction and meiotic chromosome behavior in acroceras macrum. Baltimore: Crop Science Society of America, vol. 60, no. 1, p. 330-344. E-ISSN0011-183X. 1435-0653 http://repositorio.unne.edu.ar/handle/123456789/59377 eng https://doi.org/10.1002/csc2.20081 closedAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 330-344 application/pdf Crop Science Society of America Crop Science, 2020, vol. 60, no. 1, p. 330-344.
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
description Acroceras macrum Stapf is a high-quality C3 grass species adapted to the subtropics. It is a valuable forage resource in frequently flooded environments. The objectives were to analyze the type of polyploidy, mode of reproduction, and estimate seed and pollen fertility. A living collection of 22 tetraploid and five hexaploid genotypes of A. macrum was analyzed. Type of polyploidy was analyzed from chromosomal pairing at diakinesis and prometaphase I, and meiotic irregularities were evaluated during the microsporogenesis. Pollen viability was also examined. Bivalents predominated in tetraploids and trivalents in hexaploids. Meiotic abnormalities were more frequent in hexaploids than in tetraploids, and they were mainly related to mechanisms of chromosome nondisjunction. The reproductive mode was determined by cytological analysis of megasporogenesis and megagametogenesis, seed fertility under different pollination methods, and molecular progeny tests. In both tetraploid and hexaploid races, only the development of single meiotically derived embryo sacs was observed. Greater seed production in outcrossing compared with selfing indicated a primarily allogamous matting system. Progenies from crosses between genetically different tetraploid genotypes amplified male-specific molecular markers, indicating a hybrid origin and solid evidence of sexual reproduction. Population breeding approaches developed for sexual cross-pollinated species are suited for improving A. macrum.
format Artículo
author Ferrari Usandizaga, Silvana Consuelo
Martínez, Eric Javier
Schedler, Mara
Honfi, Ana Isabel
Acuña, Carlos Alberto
spellingShingle Ferrari Usandizaga, Silvana Consuelo
Martínez, Eric Javier
Schedler, Mara
Honfi, Ana Isabel
Acuña, Carlos Alberto
Mode of reproduction and meiotic chromosome behavior in acroceras macrum
author_facet Ferrari Usandizaga, Silvana Consuelo
Martínez, Eric Javier
Schedler, Mara
Honfi, Ana Isabel
Acuña, Carlos Alberto
author_sort Ferrari Usandizaga, Silvana Consuelo
title Mode of reproduction and meiotic chromosome behavior in acroceras macrum
title_short Mode of reproduction and meiotic chromosome behavior in acroceras macrum
title_full Mode of reproduction and meiotic chromosome behavior in acroceras macrum
title_fullStr Mode of reproduction and meiotic chromosome behavior in acroceras macrum
title_full_unstemmed Mode of reproduction and meiotic chromosome behavior in acroceras macrum
title_sort mode of reproduction and meiotic chromosome behavior in acroceras macrum
publisher Crop Science Society of America
publishDate 2025
url http://repositorio.unne.edu.ar/handle/123456789/59377
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