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Biología floral en Fabaceae


Biología floral en <i>Fabaceae</i>
Biología floral en <i>Fabaceae</i>

Tomás Rodríguez-Riaño

Affiliation: Universidad de Extremadura. Facultad de Ciencias. Departamento de Biología y Producción Vegetal (Badajoz, España)

Biography: Not available

Ana Ortega-Olivencia

Affiliation: Universidad de Extremadura. Facultad de Ciencias. Departamento de Biología y Producción Vegetal (Badajoz, España)

Biography: Not available

Juan A. Devesa

Affiliation: Universidad de Extremadura. Facultad de Ciencias. Departamento de Biología y Producción Vegetal (Badajoz, España)

Biography: Not available

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Tomás Rodríguez-Riaño; Ana Ortega-Olivencia; Juan A. Devesa

About the authors 

Publication year: 1999

Language: Spanish

Subjects: Life Sciences

Collection: Ruizia. Monografías del Real Jardín Botánico

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Abstract:

A study was made of the floral characteristics, floral rewards, and pollen presentation mechanisms in 497 populations belonging to 168 taxa of the family Fabaceae represented in SW Spain. Flower size is directly correlated with most of the floral characteristics that were studied (anther biomass, pollen production and grain size, and the size of the gynoecium –ovary and style). Yellow is the commonest colour, dominant in the tribes Genisteae, Loteae , and Hedysareae. Pink-violet is predominant in Vicieae and Galegeae, in Trifolieae, these two colours are present with equal frequency. While white is a minority colour at the family level, it becomes important in the Galageae. Respecting the androecium, six types are recognized according to the fusion of staminal filaments: monadelphous, pseudomonadelphous without basal fenestration, pseudomonadelphous with basal fenestration, diadelphous, reduced diadelphous, and free. The last category has a single representative –Anagyris foetida (tribe Thermopsideae)– which is also the greatest nectar producer per flower. The diadelphous and fenestrated pseudomonadelphous types are linked to the presence of an intrastaminal nectary, so that the corresponding species are potentially nectariferous. The monadelphous and non-fenestrated pseudomonadelphous androecia appear in species whose flowers have no intrastaminal nectary and are therefore non-nectariferous, the sole exception being Retama sphaerocarpa (monadelphous) which has an extrastaminal nectary. Reduced diadelphous androecium, observed in only three taxa (Biserrula pelecinus, Vicia pubescens, and Astralagus epiglottis) could be considered as one more trait linked to the acquisition of autogamy. Both the morphology of the free part of the staminal filaments and the type of androecium profile are related in some cases to pollen presentation mechanisms. With respect to the anthers, the anther biomass of the internal whorl (Vi) is significantly less in the taxa studied than that of the external whorl (Ve). The ratio between the two (Rv) is useful as an indicator of whether there exist great differences between the whorls, including the relationship with the pollen presentation mechanism. The greatest values of Rv are found in Scorpiurus (Rv = 1.63) and the smallest in Lupinus (Rv = 0.13).

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Bibliographic information

Physical Description : 176 p. ; 24 cm

ISBN: 978-84-00-07823-2

ISSN: 0212-9108

Publication: Madrid : Consejo Superior de Investigaciones Científicas, 1999

Reference CSIC: Ruizia_16

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