Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)

The genus Senna (K. Bahuin) Miller (Cassieae) is represented in Argentina by 35 species and several varieties distributed in temperate, tropical and subtropical regions, and presents a high degree of endemism. Some taxa are used for medicine, animal foraging and ornamental purposes. Floral morpholog...

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Detalles Bibliográficos
Autor: Laporta, Cecilia
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2005
País:Costa Rica
Institución:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
Idioma:inglés
OAI Identifier:oai:portal.ucr.ac.cr:article/14361
Acceso en línea:https://revistas.ucr.ac.cr/index.php/rbt/article/view/14361
Access Level:acceso abierto
Palabra clave:Floral biology
reproductive system
Senna
cassieae
enantiostyly
buzz- pollination
bombus
biología floral
sistema reproductivo
senna
enantiostilia
polinización vibrátil
id CR_25fa84f79d47b4ce2c0dbebed12f2cd8
oai_identifier_str oai:portal.ucr.ac.cr:article/14361
network_acronym_str CR
network_name_str Costa Rica
repository_id_str
dc.title.none.fl_str_mv Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
title Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
spellingShingle Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
Laporta, Cecilia
Floral biology
reproductive system
Senna
cassieae
enantiostyly
buzz- pollination
bombus
biología floral
sistema reproductivo
senna
cassieae
enantiostilia
polinización vibrátil
bombus
title_short Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
title_full Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
title_fullStr Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
title_full_unstemmed Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
title_sort Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
dc.creator.none.fl_str_mv Laporta, Cecilia
author Laporta, Cecilia
author_facet Laporta, Cecilia
author_role author
dc.subject.none.fl_str_mv Floral biology
reproductive system
Senna
cassieae
enantiostyly
buzz- pollination
bombus
biología floral
sistema reproductivo
senna
cassieae
enantiostilia
polinización vibrátil
bombus
topic Floral biology
reproductive system
Senna
cassieae
enantiostyly
buzz- pollination
bombus
biología floral
sistema reproductivo
senna
cassieae
enantiostilia
polinización vibrátil
bombus
description The genus Senna (K. Bahuin) Miller (Cassieae) is represented in Argentina by 35 species and several varieties distributed in temperate, tropical and subtropical regions, and presents a high degree of endemism. Some taxa are used for medicine, animal foraging and ornamental purposes. Floral morphology, phases, rewards, attractants, visitors, pollen, reproductive system, P/O ratio, OCI and ISI indexes of enantiostylous Senna corymbosa were analyzed for morphological androecial differentiation and possible related functional differences between stamens groups. The study was carried out over three consecutive flowering seasons in March of 1999, 2000 and 2001, in two populations near the city of Buenos Aires, Argentina. The species has a buzz-pollination syndrome. The pollinators are Bombus atratus that vibrate the stamens, leading to nothotribic or sternotribic deposition of pollen. P/O ratio and pollen production were high thanks to the precise pollinating mechanism that needs a large delivery of pollen to ensure effective pollen deposition. P/O ratio also indicates that the species is xenogamous, although geitonogamy and autogamy (only induced, not spontaneous) were also recorded. The species is self-compatible. There were differences in hand-pollination treatments between long and medium stamens in fruit set, as well as in vitro differential fertility between their pollen grains. Hence, there are morphological and functional androecium differences: the medium stamens play a nutritional role while the long ones play a reproductive one. These differences are reflected in the breeding system. Moreover, differential fertility and enantiostyly may diminish the effects of self-compatibility by partially reducing the contribution of geitonogamy to selfing.
publishDate 2005
dc.date.none.fl_str_mv 2005-06-01
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
Article
artículo original
http://purl.org/coar/resource_type/c_2df8fbb1
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://revistas.ucr.ac.cr/index.php/rbt/article/view/14361
10.15517/rbt.v53i1-2.14361
url https://revistas.ucr.ac.cr/index.php/rbt/article/view/14361
identifier_str_mv 10.15517/rbt.v53i1-2.14361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://revistas.ucr.ac.cr/index.php/rbt/article/view/14361/13649
dc.rights.none.fl_str_mv Derechos de autor 2005 Revista de Biología Tropical
http://creativecommons.org/licenses/by/4.0
acceso abierto
http://purl.org/coar/access_right/c_abf2
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Derechos de autor 2005 Revista de Biología Tropical
http://creativecommons.org/licenses/by/4.0
acceso abierto
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad de Costa Rica
publisher.none.fl_str_mv Universidad de Costa Rica
dc.source.none.fl_str_mv Revista de Biología Tropical; Vol. 53 No. 1-2 (2005): Volume 53 - Regular number 1-2 – March-June 2005; 49–61
Revista de Biología Tropical; Vol. 53 Núm. 1-2 (2005): Volumen 53 - Número regular 1-2 – Marzo-Junio 2005; 49–61
Revista Biología Tropical; Vol. 53 N.º 1-2 (2005): Volumen 53 - Número regular 1-2 – Marzo-Junio 2005; 49–61
2215-2075
0034-7744
10.15517/rbt.v53i1-2
reponame:Portal de Revistas UCR
instname:Universidad de Costa Rica
instacron:UCR
instname_str Universidad de Costa Rica
instacron_str UCR
institution UCR
reponame_str Portal de Revistas UCR
collection Portal de Revistas UCR
repository.name.fl_str_mv Portal de Revistas UCR - Universidad de Costa Rica
repository.mail.fl_str_mv jorge.polanco@ucr.ac.cr
_version_ 1849325359635365888
spelling Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)Laporta, CeciliaFloral biologyreproductive systemSennacassieaeenantiostylybuzz- pollinationbombusbiología floralsistema reproductivosennacassieaeenantiostiliapolinización vibrátilbombusThe genus Senna (K. Bahuin) Miller (Cassieae) is represented in Argentina by 35 species and several varieties distributed in temperate, tropical and subtropical regions, and presents a high degree of endemism. Some taxa are used for medicine, animal foraging and ornamental purposes. Floral morphology, phases, rewards, attractants, visitors, pollen, reproductive system, P/O ratio, OCI and ISI indexes of enantiostylous Senna corymbosa were analyzed for morphological androecial differentiation and possible related functional differences between stamens groups. The study was carried out over three consecutive flowering seasons in March of 1999, 2000 and 2001, in two populations near the city of Buenos Aires, Argentina. The species has a buzz-pollination syndrome. The pollinators are Bombus atratus that vibrate the stamens, leading to nothotribic or sternotribic deposition of pollen. P/O ratio and pollen production were high thanks to the precise pollinating mechanism that needs a large delivery of pollen to ensure effective pollen deposition. P/O ratio also indicates that the species is xenogamous, although geitonogamy and autogamy (only induced, not spontaneous) were also recorded. The species is self-compatible. There were differences in hand-pollination treatments between long and medium stamens in fruit set, as well as in vitro differential fertility between their pollen grains. Hence, there are morphological and functional androecium differences: the medium stamens play a nutritional role while the long ones play a reproductive one. These differences are reflected in the breeding system. Moreover, differential fertility and enantiostyly may diminish the effects of self-compatibility by partially reducing the contribution of geitonogamy to selfing.Se analizaron la morfología y fases florales, recompensa, atractivos, visitantes, polen, sistema reproductivo, índices OCI e ISI y relación polen/óvulo de la especie enantiostílica Senna corymbosa. El objetivo fue estudiar su biología floral y determinar la posible presencia de diferenciación morfológica en el androceo. Era importante saber si las diferencias morfológicas reflejaban diferencias funcionales entre los grupos de estambres. El estudio se llevó a cabo durante tres estaciones de floración consecutivas en marzo de 1999, 2000 y 2001, sobre dos poblaciones presentes en zonas protegidas de la ciudad de Buenos Aires, Argentina. La especie presenta un síndrome de polinización vibrátil (buzz-pollination). Los polinizadores son individuos de Bombus atratus, capaces de vibrar los estambres y extraer polen, el que se deposita nototríbica y/o esternotríbicamente. La relación P/O fue extremadamente elevada, así como la producción de polen. Esto se relaciona con el comportamiento de los visitantes y con la alta precisión del mecanismo de polinización, que requiere una gran cantidad de polen para asegurar su efectiva deposición en el cuerpo del insecto. La relación P/O indica que la especie es xenógama, aunque se registraron también geitonogamia y autogamia inducidas. La especie, por lo tanto, es autocompatible. Se encontraron diferencias en los tratamientos de polinización manual entre estambres largos y medianos en cuanto al establecimiento de frutos, así como una fertilidad diferencial in vitro entre sus tipos polínicos. Existen, así, diferencias morfológicas y funcionales en el androceo: los estambres medianos tienen un papel nutricional mientras que los largos cumplen un papel reproductivo. Estas diferencias se reflejan en el sistema de cruzamiento. Más aún, la fertilidad diferencial y la enantiostilia disminuyen los efectos de la autocompatibilidad reduciendo parcialmente la contribución de la geitonogamia a la endogamia.Universidad de Costa Rica2005-06-01info:eu-repo/semantics/publishedVersionArticleartículo originalhttp://purl.org/coar/resource_type/c_2df8fbb1info:eu-repo/semantics/articleapplication/pdfhttps://revistas.ucr.ac.cr/index.php/rbt/article/view/1436110.15517/rbt.v53i1-2.14361Revista de Biología Tropical; Vol. 53 No. 1-2 (2005): Volume 53 - Regular number 1-2 – March-June 2005; 49–61Revista de Biología Tropical; Vol. 53 Núm. 1-2 (2005): Volumen 53 - Número regular 1-2 – Marzo-Junio 2005; 49–61Revista Biología Tropical; Vol. 53 N.º 1-2 (2005): Volumen 53 - Número regular 1-2 – Marzo-Junio 2005; 49–612215-20750034-774410.15517/rbt.v53i1-2reponame:Portal de Revistas UCRinstname:Universidad de Costa Ricainstacron:UCRenghttps://revistas.ucr.ac.cr/index.php/rbt/article/view/14361/13649Derechos de autor 2005 Revista de Biología Tropicalhttp://creativecommons.org/licenses/by/4.0acceso abiertohttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccess2022-05-30T17:43:37Zoai:portal.ucr.ac.cr:article/14361Portal de revistashttps://revistas.ucr.ac.cr/Universidadhttp://www.ucr.ac.crhttps://revistas.ucr.ac.cr/index.php/index/oaijorge.polanco@ucr.ac.crCosta RicaNo aplicaNo aplicaNo aplicaopendoar:2025-08-13T10:16:17.249Portal de Revistas UCR - Universidad de Costa Ricafalse
score 15,811543

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