Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?

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We examined diurnal and nocturnal nectar secretion across sexual stages in protandrous Alstroemeria aurea, a bumble bee-pollinated herb with long-lived flowers native to the southern Andes. We found the following patterns: (1) most nectar was produced diurnally and (2) three times more sugar was sec...

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Autores principales: Aizen, M.A., Basilio, A.
Formato: Artículo publishedVersion
Publicado: 1998
Materias:
Alstroemeria aurea
Alstroemeriaceae
Bumble bees
Male and female functions
Nectar secretion
Plasticity
Pollen removal and deposition
Protandry
flower visiting
nectar
secretion
temporal variation
Andes
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p245_Aizen
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00029122_v85_n2_p245_Aizen_oai
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Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_00029122_v85_n2_p245_Aizen_oai
record_format dspace
spelling I28-R145-paper_00029122_v85_n2_p245_Aizen_oai2024-08-16 Aizen, M.A. Basilio, A. 1998 We examined diurnal and nocturnal nectar secretion across sexual stages in protandrous Alstroemeria aurea, a bumble bee-pollinated herb with long-lived flowers native to the southern Andes. We found the following patterns: (1) most nectar was produced diurnally and (2) three times more sugar was secreted during the male than female phase, not only because the male phase lasted longer but also because the rate of nectar production was higher. This 3:1 ratio in nectar production matched the ratio of the minimum number of bumble bee visits required on average to saturate male (pollen removal) vs. female (seed set) functions. Standing crop of nectar, on the other hand, did not differ greatly between male- and female-stage flowers left open to visitors, because the high-production male-phase flowers were visited more frequently than female-phase flowers. In an experiment concurrent with the repeated nectar sampling of individual flowers over their life-span, we removed pollen from anthers or deposited pollen on stigmas by hand. Neither treatment, designed to mimic effects of visits by Alstroemeria's native bumble bee pollinator, affected nectar production. The absence of plasticity in nectar secretion in relation to pollination events may reflect a low cost of nectar production, or may result from developmental constraints related to the evolution of the synchronous protandry that characterizes A. aurea. Fil:Basilio, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p245_Aizen info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Am. J. Bot. 1998;85(2):245-252 Alstroemeria aurea Alstroemeriaceae Bumble bees Male and female functions Nectar secretion Plasticity Pollen removal and deposition Protandry flower visiting nectar secretion temporal variation Andes South America Alstroemeria aurea Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt? info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00029122_v85_n2_p245_Aizen_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic Alstroemeria aurea
Alstroemeriaceae
Bumble bees
Male and female functions
Nectar secretion
Plasticity
Pollen removal and deposition
Protandry
flower visiting
nectar
secretion
temporal variation
Andes
South America
Alstroemeria aurea
spellingShingle Alstroemeria aurea
Alstroemeriaceae
Bumble bees
Male and female functions
Nectar secretion
Plasticity
Pollen removal and deposition
Protandry
flower visiting
nectar
secretion
temporal variation
Andes
South America
Alstroemeria aurea
Aizen, M.A.
Basilio, A.
Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
topic_facet Alstroemeria aurea
Alstroemeriaceae
Bumble bees
Male and female functions
Nectar secretion
Plasticity
Pollen removal and deposition
Protandry
flower visiting
nectar
secretion
temporal variation
Andes
South America
Alstroemeria aurea
description We examined diurnal and nocturnal nectar secretion across sexual stages in protandrous Alstroemeria aurea, a bumble bee-pollinated herb with long-lived flowers native to the southern Andes. We found the following patterns: (1) most nectar was produced diurnally and (2) three times more sugar was secreted during the male than female phase, not only because the male phase lasted longer but also because the rate of nectar production was higher. This 3:1 ratio in nectar production matched the ratio of the minimum number of bumble bee visits required on average to saturate male (pollen removal) vs. female (seed set) functions. Standing crop of nectar, on the other hand, did not differ greatly between male- and female-stage flowers left open to visitors, because the high-production male-phase flowers were visited more frequently than female-phase flowers. In an experiment concurrent with the repeated nectar sampling of individual flowers over their life-span, we removed pollen from anthers or deposited pollen on stigmas by hand. Neither treatment, designed to mimic effects of visits by Alstroemeria's native bumble bee pollinator, affected nectar production. The absence of plasticity in nectar secretion in relation to pollination events may reflect a low cost of nectar production, or may result from developmental constraints related to the evolution of the synchronous protandry that characterizes A. aurea.
format Artículo
Artículo
publishedVersion
author Aizen, M.A.
Basilio, A.
author_facet Aizen, M.A.
Basilio, A.
author_sort Aizen, M.A.
title Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_short Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_full Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_fullStr Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_full_unstemmed Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_sort sex differential nectar secretion in protandrous alstroemeria aurea (alstroemeriaceae): is production altered by pollen removal and receipt?
publishDate 1998
url http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p245_Aizen
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00029122_v85_n2_p245_Aizen_oai
work_keys_str_mv AT aizenma sexdifferentialnectarsecretioninprotandrousalstroemeriaaureaalstroemeriaceaeisproductionalteredbypollenremovalandreceipt
AT basilioa sexdifferentialnectarsecretioninprotandrousalstroemeriaaureaalstroemeriaceaeisproductionalteredbypollenremovalandreceipt
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