Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)

In gynodioecious species, male-steriles (termed ‘‘females’’ hereafter) usually exhibit some reproductive advantage over hermaph- rodites that allow them to compensate for the loss of male reproductive function. This compensation can result from higher fecundity, vegetative outperformance, and/or low...

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Detalles Bibliográficos
Autores: Alonso, Conchita, Herrera, Carlos M.
Tipo de recurso: artículo
Fecha de publicación:2001
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/41958
Acceso en línea:http://hdl.handle.net/10261/41958
Access Level:acceso abierto
Palabra clave:Altitudinal gradients
Daphne laureola
gynodioecy
inbreeding depression
sex ratio
Sexual dimorphism
Thymelaeaceae
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spelling Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)Alonso, ConchitaHerrera, Carlos M.Altitudinal gradientsDaphne laureolagynodioecyinbreeding depressionsex ratioSexual dimorphismThymelaeaceaeIn gynodioecious species, male-steriles (termed ‘‘females’’ hereafter) usually exhibit some reproductive advantage over hermaph- rodites that allow them to compensate for the loss of male reproductive function. This compensation can result from higher fecundity, vegetative outperformance, and/or lower inbreeding depression. In this study we compared vegetative and reproductive parameters of female and hermaphrodite Daphne laureola individuals in two southeastern Spanish populations and estimated the magnitude of inbreeding depression up to the seedling emergence stage by conducting controlled pollinations and experimental sowings of seed progenies in the field. Reproductive shrubs of both sexes did not differ significantly in size, leaf production, leaf size, leaf growth, nutrient allocation to leaves, and production of flowers and fruits. Seed set and seed size of cross- and self-pollinated flowers of hermaphrodites and cross-pollinated females were also similar. Seedling emergence rates of self- and cross-pollinated seeds from hermaphrodites under natural field conditions were similar, suggesting a minor role of inbreeding depression up to that reproductive stage. Seeds from females produced more seedlings than selfed seeds from hermaphrodites. In 21 populations surveyed in the study region over a broad geographical and elevational gradient, the proportion of females ranged between 20.6 and 56.1% and was inversely related to elevation. The establishment and maintenance of females in southeastern Spanish populations of D. laureola seem to be mainly mediated by ecological factorsPeer reviewedBotanical Society of America201120112001info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/41958reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.amjbot.org/content/88/6/1016.full.pdf+htmlinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/419582026-05-22T06:33:51Z
dc.title.none.fl_str_mv Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
title Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
spellingShingle Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
Alonso, Conchita
Altitudinal gradients
Daphne laureola
gynodioecy
inbreeding depression
sex ratio
Sexual dimorphism
Thymelaeaceae
title_short Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
title_full Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
title_fullStr Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
title_full_unstemmed Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
title_sort Neither vegetative nor reproductive advantages account for high frequency of male-steriles in Southern spanish Gynodioecious Daphne laureola (Thymelaeaceae)
dc.creator.none.fl_str_mv Alonso, Conchita
Herrera, Carlos M.
author Alonso, Conchita
author_facet Alonso, Conchita
Herrera, Carlos M.
author_role author
author2 Herrera, Carlos M.
author2_role author
dc.subject.none.fl_str_mv Altitudinal gradients
Daphne laureola
gynodioecy
inbreeding depression
sex ratio
Sexual dimorphism
Thymelaeaceae
topic Altitudinal gradients
Daphne laureola
gynodioecy
inbreeding depression
sex ratio
Sexual dimorphism
Thymelaeaceae
description In gynodioecious species, male-steriles (termed ‘‘females’’ hereafter) usually exhibit some reproductive advantage over hermaph- rodites that allow them to compensate for the loss of male reproductive function. This compensation can result from higher fecundity, vegetative outperformance, and/or lower inbreeding depression. In this study we compared vegetative and reproductive parameters of female and hermaphrodite Daphne laureola individuals in two southeastern Spanish populations and estimated the magnitude of inbreeding depression up to the seedling emergence stage by conducting controlled pollinations and experimental sowings of seed progenies in the field. Reproductive shrubs of both sexes did not differ significantly in size, leaf production, leaf size, leaf growth, nutrient allocation to leaves, and production of flowers and fruits. Seed set and seed size of cross- and self-pollinated flowers of hermaphrodites and cross-pollinated females were also similar. Seedling emergence rates of self- and cross-pollinated seeds from hermaphrodites under natural field conditions were similar, suggesting a minor role of inbreeding depression up to that reproductive stage. Seeds from females produced more seedlings than selfed seeds from hermaphrodites. In 21 populations surveyed in the study region over a broad geographical and elevational gradient, the proportion of females ranged between 20.6 and 56.1% and was inversely related to elevation. The establishment and maintenance of females in southeastern Spanish populations of D. laureola seem to be mainly mediated by ecological factors
publishDate 2001
dc.date.none.fl_str_mv 2001
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/41958
url http://hdl.handle.net/10261/41958
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.amjbot.org/content/88/6/1016.full.pdf+html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Botanical Society of America
publisher.none.fl_str_mv Botanical Society of America
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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