Competition between meiotic and apomictic pathways during ovule and seed development results in clonality

Meiotic and apomictic reproductive pathways develop simultaneously in facultative aposporous species, and compete to form a seed as a final goal. This developmental competition was evaluated in tetraploid genotypes of Paspalum malacophyllum in order to understand the low level of sexuality in fac...

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Autores principales: Hojsgaard, Diego Hernán, Martínez, Eric Javier, Quarin, Camilo Luis
Formato: Artículo
Lenguaje:Inglés
Publicado: Wiley 2022
Materias:
AFLP
Apomixis
Cytoembryology
Flow cytometry
Meiosis
Progeny test
Sexual reproduction
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/37737
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-37737
record_format dspace
spelling I48-R184-123456789-377372024-09-30T12:16:35Z Competition between meiotic and apomictic pathways during ovule and seed development results in clonality Hojsgaard, Diego Hernán Martínez, Eric Javier Quarin, Camilo Luis AFLP Apomixis Cytoembryology Flow cytometry Meiosis Progeny test Sexual reproduction Meiotic and apomictic reproductive pathways develop simultaneously in facultative aposporous species, and compete to form a seed as a final goal. This developmental competition was evaluated in tetraploid genotypes of Paspalum malacophyllum in order to understand the low level of sexuality in facultative apomictic populations. Cyto-embryology on ovules, flow cytometry on seeds and progeny tests by DNA fingerprinting were used to measure the relative incidence of each meiotic or apomictic pathway along four different stages of the plant’s life cycle, namely the beginning and end of gametogenesis, seed formation and adult offspring. A high variation in the frequencies of sexual and apomictic pathways occurred at the first two stages. A trend of radical decline in realized sexuality was then observed. Sexual and apomictic seeds were produced, but the efficiency of the sexual pathway dropped drastically, and exclusively clonal offspring remained. Both reproductive pathways are unstable at the beginning of development, and only the apomictic one remains functional. Key factors reducing sexuality are the faster growth and parthenogenetic development in the aposporous pathway, and an (epi)genetically negative background related to the extensive gene de-regulation pattern responsible for apomixis. The effects of inbreeding depression during post-fertilization development may further decrease the frequency of effective sexuality. 2022-04-21T13:09:54Z 2022-04-21T13:09:54Z 2013-01 Artículo Hojsgaard, Diego Hernán, Martínez, Eric Javier y Quarin, Camilo Luis, 2013. Competition between meiotic and apomictic pathways during ovule and seed development results in clonality. New Phytologist. Londres: Wiley, vol. 197, no. 1, p. 336-347. ISSN-e 1469-8137. http://repositorio.unne.edu.ar/handle/123456789/37737 eng https://nph.onlinelibrary.wiley.com/doi/epdf/10.1111/j.1469-8137.2012.04381.x openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Wiley New Phytologist, 2013, vol. 197, no. 1, p. 336-347.
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 AFLP
Apomixis
Cytoembryology
Flow cytometry
Meiosis
Progeny test
Sexual reproduction
spellingShingle AFLP
Apomixis
Cytoembryology
Flow cytometry
Meiosis
Progeny test
Sexual reproduction
Hojsgaard, Diego Hernán
Martínez, Eric Javier
Quarin, Camilo Luis
Competition between meiotic and apomictic pathways during ovule and seed development results in clonality
topic_facet AFLP
Apomixis
Cytoembryology
Flow cytometry
Meiosis
Progeny test
Sexual reproduction
description Meiotic and apomictic reproductive pathways develop simultaneously in facultative aposporous species, and compete to form a seed as a final goal. This developmental competition was evaluated in tetraploid genotypes of Paspalum malacophyllum in order to understand the low level of sexuality in facultative apomictic populations. Cyto-embryology on ovules, flow cytometry on seeds and progeny tests by DNA fingerprinting were used to measure the relative incidence of each meiotic or apomictic pathway along four different stages of the plant’s life cycle, namely the beginning and end of gametogenesis, seed formation and adult offspring. A high variation in the frequencies of sexual and apomictic pathways occurred at the first two stages. A trend of radical decline in realized sexuality was then observed. Sexual and apomictic seeds were produced, but the efficiency of the sexual pathway dropped drastically, and exclusively clonal offspring remained. Both reproductive pathways are unstable at the beginning of development, and only the apomictic one remains functional. Key factors reducing sexuality are the faster growth and parthenogenetic development in the aposporous pathway, and an (epi)genetically negative background related to the extensive gene de-regulation pattern responsible for apomixis. The effects of inbreeding depression during post-fertilization development may further decrease the frequency of effective sexuality.
format Artículo
author Hojsgaard, Diego Hernán
Martínez, Eric Javier
Quarin, Camilo Luis
author_facet Hojsgaard, Diego Hernán
Martínez, Eric Javier
Quarin, Camilo Luis
author_sort Hojsgaard, Diego Hernán
title Competition between meiotic and apomictic pathways during ovule and seed development results in clonality
title_short Competition between meiotic and apomictic pathways during ovule and seed development results in clonality
title_full Competition between meiotic and apomictic pathways during ovule and seed development results in clonality
title_fullStr Competition between meiotic and apomictic pathways during ovule and seed development results in clonality
title_full_unstemmed Competition between meiotic and apomictic pathways during ovule and seed development results in clonality
title_sort competition between meiotic and apomictic pathways during ovule and seed development results in clonality
publisher Wiley
publishDate 2022
url http://repositorio.unne.edu.ar/handle/123456789/37737
work_keys_str_mv AT hojsgaarddiegohernan competitionbetweenmeioticandapomicticpathwaysduringovuleandseeddevelopmentresultsinclonality
AT martinezericjavier competitionbetweenmeioticandapomicticpathwaysduringovuleandseeddevelopmentresultsinclonality
AT quarincamiloluis competitionbetweenmeioticandapomicticpathwaysduringovuleandseeddevelopmentresultsinclonality
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