Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower

Background and Aims In distylous species, the reciprocal arrangement of sexual organs between long-styled and short-styled individuals promotes disassortative pollen flow through a fine-tuned interaction with pollinators. Despite its evolutionary importance, deviation from this expectation due to su...

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Autor: Valverde Morillas, Francisco Javier
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:dnet:idus________::2228e20e960f71cf35aa4525e0f9241c
Acesso em linha:https://hdl.handle.net/11441/184452
https://doi.org/10.1093/aob/mcaf281
Access Level:acceso abierto
Palavra-chave:Pollination
Pollination success
Flower polymorphism
Distyly
Linum narbonense
Pollen receipt
Pollen tubes
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spelling Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flowerValverde Morillas, Francisco JavierPollinationPollination successFlower polymorphismDistylyLinum narbonensePollen receiptPollen tubesBackground and Aims In distylous species, the reciprocal arrangement of sexual organs between long-styled and short-styled individuals promotes disassortative pollen flow through a fine-tuned interaction with pollinators. Despite its evolutionary importance, deviation from this expectation due to suboptimal pollinator performance has been little studied in species with open corollas. This study addresses which insects visiting the flowers of Linum narbonense (Linaceae) promote or break down the expected patterns of pollination. Methods Sixteen samplings performed in 12 populations allowed me to analyse the relationship between flower visitors and pollination performance of each floral morph. A total of 3494 stigmas were analysed to measure two components of pollination success: a quantity component that included the proportion of pollinated stigmas and pollen load on stigmas; and a quality component that included for the first time the relationship between pollen tubes and pollen grains on stigmas. Hand-pollination experiments made it possible to characterize the breeding system and to construct a null model of the pollen tube response to legitimate pollen. Key Results Contrary to long-styled flowers, flowers with short stigmas showed wide variation in the quality of pollen receipt across sampling units, usually being lower than expected by the null model. This variation depended on the proportion of flower visits by insects from the Usia genus (Bombyliidae): low visitation rates by these insects were associated with lower pollen quality deposited on short stigmas. Conclusions This study demonstrates the value of addressing the quantity and quality of pollen receipt to correlate pollination success with contemporary pollinator environment. The novel use of the relationship of pollen tube to pollen grain demonstrated the importance of Usia pollinators in promoting disassortative pollination in the distylous L. narbonense. These findings emphasize the importance of identifying which flower visitors promote the functioning of distyly or, conversely, disrupt it, biasing the functional gender of floral morphs.Oxford University PressBiología Vegetal y Ecología2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/184452https://doi.org/10.1093/aob/mcaf281reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésAnnals of Botany, 137 (3), 713-724. info:eu-repo/semantics/openAccessoai:dnet:idus________::2228e20e960f71cf35aa4525e0f9241c2026-06-17T12:51:07Z
dc.title.none.fl_str_mv Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
title Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
spellingShingle Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
Valverde Morillas, Francisco Javier
Pollination
Pollination success
Flower polymorphism
Distyly
Linum narbonense
Pollen receipt
Pollen tubes
title_short Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
title_full Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
title_fullStr Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
title_full_unstemmed Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
title_sort Contrasting effects of pollinators on the pollination success of floral morphs of a distylous bowl-shaped flower
dc.creator.none.fl_str_mv Valverde Morillas, Francisco Javier
author Valverde Morillas, Francisco Javier
author_facet Valverde Morillas, Francisco Javier
author_role author
dc.contributor.none.fl_str_mv Biología Vegetal y Ecología
dc.subject.none.fl_str_mv Pollination
Pollination success
Flower polymorphism
Distyly
Linum narbonense
Pollen receipt
Pollen tubes
topic Pollination
Pollination success
Flower polymorphism
Distyly
Linum narbonense
Pollen receipt
Pollen tubes
description Background and Aims In distylous species, the reciprocal arrangement of sexual organs between long-styled and short-styled individuals promotes disassortative pollen flow through a fine-tuned interaction with pollinators. Despite its evolutionary importance, deviation from this expectation due to suboptimal pollinator performance has been little studied in species with open corollas. This study addresses which insects visiting the flowers of Linum narbonense (Linaceae) promote or break down the expected patterns of pollination. Methods Sixteen samplings performed in 12 populations allowed me to analyse the relationship between flower visitors and pollination performance of each floral morph. A total of 3494 stigmas were analysed to measure two components of pollination success: a quantity component that included the proportion of pollinated stigmas and pollen load on stigmas; and a quality component that included for the first time the relationship between pollen tubes and pollen grains on stigmas. Hand-pollination experiments made it possible to characterize the breeding system and to construct a null model of the pollen tube response to legitimate pollen. Key Results Contrary to long-styled flowers, flowers with short stigmas showed wide variation in the quality of pollen receipt across sampling units, usually being lower than expected by the null model. This variation depended on the proportion of flower visits by insects from the Usia genus (Bombyliidae): low visitation rates by these insects were associated with lower pollen quality deposited on short stigmas. Conclusions This study demonstrates the value of addressing the quantity and quality of pollen receipt to correlate pollination success with contemporary pollinator environment. The novel use of the relationship of pollen tube to pollen grain demonstrated the importance of Usia pollinators in promoting disassortative pollination in the distylous L. narbonense. These findings emphasize the importance of identifying which flower visitors promote the functioning of distyly or, conversely, disrupt it, biasing the functional gender of floral morphs.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/184452
https://doi.org/10.1093/aob/mcaf281
url https://hdl.handle.net/11441/184452
https://doi.org/10.1093/aob/mcaf281
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Annals of Botany, 137 (3), 713-724.
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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