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Abstract:

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.

Registro:

Documento: Artículo
Título:Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)
Autor:Laporta, C.
Filiación:Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428, Buenos Aires, Argentina
Palabras clave:Bombus; Buzz- Pollination; Cassieae; Enantiostyly; Floral biology; Reproductive system; Senna; animal; Argentina; article; bee; breeding; fertilization; flower; germination; histology; physiology; pollen; reproduction; Senna; Animals; Argentina; Bees; Breeding; Cassia; Fertilization; Flowers; Germination; Pollen; Reproduction; Senna Plant; Animalia; Bombus atratus; Caesalpinioideae; Cassieae; Senna; Senna corymbosa
Año:2005
Volumen:53
Número:1-2
Página de inicio:49
Página de fin:61
Título revista:Revista de Biologia Tropical
Título revista abreviado:Rev. Biol. Trop.
ISSN:00347744
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00347744_v53_n1-2_p49_Laporta

Referencias:

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Citas:

---------- APA ----------
(2005) . Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae). Revista de Biologia Tropical, 53(1-2), 49-61.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00347744_v53_n1-2_p49_Laporta [ ]
---------- CHICAGO ----------
Laporta, C. "Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)" . Revista de Biologia Tropical 53, no. 1-2 (2005) : 49-61.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00347744_v53_n1-2_p49_Laporta [ ]
---------- MLA ----------
Laporta, C. "Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)" . Revista de Biologia Tropical, vol. 53, no. 1-2, 2005, pp. 49-61.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00347744_v53_n1-2_p49_Laporta [ ]
---------- VANCOUVER ----------
Laporta, C. Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae). Rev. Biol. Trop. 2005;53(1-2):49-61.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00347744_v53_n1-2_p49_Laporta [ ]