Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)

The pollen/ovule (P/O) ratio has been used as predictor of the reproductive system of angiosperms (lowest P/O values correspond to obligate autogamous species while the highest correlate with obligate xenogamous species) but it does not keep for all the taxa. The relation of P/O index with pollen an...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: García, M.T.A., Miguez, M.B., Gottsberger, G.
Formato: JOUR
Materias:
Anthesis
Breeding systems
Flower size
Plant longevity
Pollen size
Pollen vitality
Pollen-bearing area
Pollinators
Sexual system
Stigma area
Apoidea
Magnoliophyta
Passiflora
Passiflora misera
Passifloraceae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02111322_v71_n2_p_Garcia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02111322_v71_n2_p_Garcia
record_format dspace
spelling todo:paper_02111322_v71_n2_p_Garcia2023-10-03T15:10:01Z Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae) García, M.T.A. Miguez, M.B. Gottsberger, G. Anthesis Breeding systems Flower size Plant longevity Pollen size Pollen vitality Pollen-bearing area Pollinators Sexual system Stigma area Apoidea Magnoliophyta Passiflora Passiflora misera Passifloraceae The pollen/ovule (P/O) ratio has been used as predictor of the reproductive system of angiosperms (lowest P/O values correspond to obligate autogamous species while the highest correlate with obligate xenogamous species) but it does not keep for all the taxa. The relation of P/O index with pollen and stigma size, flower diameter, pollen vitality, stigmatic area/pollen-bearing area of the pollinators ratio (SA/PBA), taxonomy and breeding system was analyzed in four Passiflora species with different degree of compatibility, pollination system and taxonomic placement. P/O of the self-compatible species (with shorter anthesis, scarce pollinator visits or minor longevity) was lower than P/O of the self-incompatible ones. The P/O values of the outcrossers could be related with the highly efficient pollination performed by the frequently visiting Xylocopa species; these bees transport Passiflora pollen in a usually monospecific mass on the thorax, resembling grouped pollen dispersal. All the taxa exhibited pollen with unimodal size and high vitality, except for P. misera, in which pollen size was bimodal, with similar quantities of grains in both classes, the large being more vital than the small ones. Correlations of P/O were positive with flower size, negative with stigma area/pollen-bearing area of the pollinator, null with stigma area and not significant with pollen size. The P/O ratio did not reflect taxonomic affinities; this index and the breeding system were more related with pollinator type, anthesis, flower size and SA/PBA than with pollen grain or stigma size. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02111322_v71_n2_p_Garcia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anthesis
Breeding systems
Flower size
Plant longevity
Pollen size
Pollen vitality
Pollen-bearing area
Pollinators
Sexual system
Stigma area
Apoidea
Magnoliophyta
Passiflora
Passiflora misera
Passifloraceae
spellingShingle Anthesis
Breeding systems
Flower size
Plant longevity
Pollen size
Pollen vitality
Pollen-bearing area
Pollinators
Sexual system
Stigma area
Apoidea
Magnoliophyta
Passiflora
Passiflora misera
Passifloraceae
García, M.T.A.
Miguez, M.B.
Gottsberger, G.
Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)
topic_facet Anthesis
Breeding systems
Flower size
Plant longevity
Pollen size
Pollen vitality
Pollen-bearing area
Pollinators
Sexual system
Stigma area
Apoidea
Magnoliophyta
Passiflora
Passiflora misera
Passifloraceae
description The pollen/ovule (P/O) ratio has been used as predictor of the reproductive system of angiosperms (lowest P/O values correspond to obligate autogamous species while the highest correlate with obligate xenogamous species) but it does not keep for all the taxa. The relation of P/O index with pollen and stigma size, flower diameter, pollen vitality, stigmatic area/pollen-bearing area of the pollinators ratio (SA/PBA), taxonomy and breeding system was analyzed in four Passiflora species with different degree of compatibility, pollination system and taxonomic placement. P/O of the self-compatible species (with shorter anthesis, scarce pollinator visits or minor longevity) was lower than P/O of the self-incompatible ones. The P/O values of the outcrossers could be related with the highly efficient pollination performed by the frequently visiting Xylocopa species; these bees transport Passiflora pollen in a usually monospecific mass on the thorax, resembling grouped pollen dispersal. All the taxa exhibited pollen with unimodal size and high vitality, except for P. misera, in which pollen size was bimodal, with similar quantities of grains in both classes, the large being more vital than the small ones. Correlations of P/O were positive with flower size, negative with stigma area/pollen-bearing area of the pollinator, null with stigma area and not significant with pollen size. The P/O ratio did not reflect taxonomic affinities; this index and the breeding system were more related with pollinator type, anthesis, flower size and SA/PBA than with pollen grain or stigma size.
format JOUR
author García, M.T.A.
Miguez, M.B.
Gottsberger, G.
author_facet García, M.T.A.
Miguez, M.B.
Gottsberger, G.
author_sort García, M.T.A.
title Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)
title_short Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)
title_full Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)
title_fullStr Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)
title_full_unstemmed Pollen: Ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae)
title_sort pollen: ovule ratio and its relationship with other reproductive traits in some passiflora species (passifloraceae)
url http://hdl.handle.net/20.500.12110/paper_02111322_v71_n2_p_Garcia
work_keys_str_mv AT garciamta pollenovuleratioanditsrelationshipwithotherreproductivetraitsinsomepassifloraspeciespassifloraceae
AT miguezmb pollenovuleratioanditsrelationshipwithotherreproductivetraitsinsomepassifloraspeciespassifloraceae
AT gottsbergerg pollenovuleratioanditsrelationshipwithotherreproductivetraitsinsomepassifloraspeciespassifloraceae
_version_ 1807318115064741888

Ejemplares similares