Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)

Observations made in Salta, northern Argentina, for a complete flowering season of five plants from several patches, allowed the authors to conclude: 1. anthesis lasts 9-13 hours and consists of two floral phases, in the last of which the stigma is not receptive; 2. stigma is receptive in the bud wh...

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Autores principales: Hoc, P.S., Amela García, M.T.
Formato: JOUR
Materias:
Argentina
Fabaceae
Floral biology
Phaseolus
Reproductive system
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00347744_v47_n1-2_p59_Hoc
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00347744_v47_n1-2_p59_Hoc
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spelling todo:paper_00347744_v47_n1-2_p59_Hoc2023-10-03T14:46:18Z Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae) Hoc, P.S. Amela García, M.T. Argentina Fabaceae Floral biology Phaseolus Reproductive system Observations made in Salta, northern Argentina, for a complete flowering season of five plants from several patches, allowed the authors to conclude: 1. anthesis lasts 9-13 hours and consists of two floral phases, in the last of which the stigma is not receptive; 2. stigma is receptive in the bud when anthers are not dehiscent, hence the flowers are protogynous; 3. nectar is secreted during phase 1 only; 4. the nectar composition fits that of melittophylous plants; 5. rain or drizzle do not affect the nectar composition or pollen viability because they are highly protected but do affect visitation by pollinators; 6. flowers are flag-blossom pollination units with pollen presented on stylar subapical trichomes, adapted to medium-sized hymenopterans, which transfer the pollen on their heads; 7. the ISI and RRS reproductive indeses show that the variety is partially self-compatible, but insect visitation increases reproductive success; 8. individuals of Centris sp. and a breed of Bombus atratus are the most important legitimate visitors because they work on all conspecific plants and suck nectar in few flowers (phase 1) per plant during each visit, while individuals of Bombus opifex, the other breed of B.atratus and Megachile spp. are also legitimate pollinators but less frequent or not constant; 9. some Lepidoptera are nectar robbers because they suck nectar but do not trigger the pollen transfer mechanism. Fil:Hoc, P.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Amela García, M.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00347744_v47_n1-2_p59_Hoc
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Fabaceae
Floral biology
Phaseolus
Reproductive system
spellingShingle Argentina
Fabaceae
Floral biology
Phaseolus
Reproductive system
Hoc, P.S.
Amela García, M.T.
Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)
topic_facet Argentina
Fabaceae
Floral biology
Phaseolus
Reproductive system
description Observations made in Salta, northern Argentina, for a complete flowering season of five plants from several patches, allowed the authors to conclude: 1. anthesis lasts 9-13 hours and consists of two floral phases, in the last of which the stigma is not receptive; 2. stigma is receptive in the bud when anthers are not dehiscent, hence the flowers are protogynous; 3. nectar is secreted during phase 1 only; 4. the nectar composition fits that of melittophylous plants; 5. rain or drizzle do not affect the nectar composition or pollen viability because they are highly protected but do affect visitation by pollinators; 6. flowers are flag-blossom pollination units with pollen presented on stylar subapical trichomes, adapted to medium-sized hymenopterans, which transfer the pollen on their heads; 7. the ISI and RRS reproductive indeses show that the variety is partially self-compatible, but insect visitation increases reproductive success; 8. individuals of Centris sp. and a breed of Bombus atratus are the most important legitimate visitors because they work on all conspecific plants and suck nectar in few flowers (phase 1) per plant during each visit, while individuals of Bombus opifex, the other breed of B.atratus and Megachile spp. are also legitimate pollinators but less frequent or not constant; 9. some Lepidoptera are nectar robbers because they suck nectar but do not trigger the pollen transfer mechanism.
format JOUR
author Hoc, P.S.
Amela García, M.T.
author_facet Hoc, P.S.
Amela García, M.T.
author_sort Hoc, P.S.
title Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)
title_short Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)
title_full Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)
title_fullStr Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)
title_full_unstemmed Biología floral y sistema reproductivo de Phaseolus vulgaris var. aborigineus (Fabaceae)
title_sort biología floral y sistema reproductivo de phaseolus vulgaris var. aborigineus (fabaceae)
url http://hdl.handle.net/20.500.12110/paper_00347744_v47_n1-2_p59_Hoc
work_keys_str_mv AT hocps biologiafloralysistemareproductivodephaseolusvulgarisvaraborigineusfabaceae
AT amelagarciamt biologiafloralysistemareproductivodephaseolusvulgarisvaraborigineusfabaceae
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