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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/36114
Title: Intra-plant Variation in Nectar Sugar Composition in Two Aquilegia Species (Ranunculaceae): Contrasting Patterns under Field and Glasshouse Conditions
Authors: Canto, Azucena; Pérez, Ricardo; Medrano, Mónica; Castellanos, María Clara; Herrera, Carlos M.
Keywords: Abiotic environment
Aquilegia pyrenaica subsp. cazorlensis
Aquilegia vulgaris subsp. vulgaris
Biotic factors
Field conditions
Iberian Peninsula
Inter and intra specific variation
nectar-sugar composition
Variance components
Issue Date: 26-Jan-2007
Publisher: Oxford University Press
Citation: Annals of Botany 99(4): 653-660 (2007)
Abstract: Background and Aims Intra-specific variation in nectar chemistry under natural conditions has been only rarely explored, yet it is an essential aspect of our understanding of how pollinator-mediated selection might act on nectar traits. This paper examines intra-specific variation in nectar sugar composition in field and glasshouse plants of the bumblebee-pollinated perennial herbs Aquilegia vulgaris subsp. vulgaris and Aquilegia pyrenaica subsp. cazorlensis (Ranunculaceae). The aims of the study are to assess the generality of extreme intra-plant variation in nectar sugar composition recently reported for other species in the field, and gaining insight on the possible mechanisms involved. Methods The proportions of glucose, fructose and sucrose in single-nectary nectar samples collected from field and glasshouse plants were determined using high performance liquid chromatography. A hierarchical variance partition was used to dissect total variance into components due to variation among plants, flowers within plants, and nectaries within flowers. Key Results Nectar of the two species was mostly sucrose-dominated, but composition varied widely in the field, ranging from sucrose-only to fructose-dominated. Most intra-specific variance was due to differences among nectaries of the same flower, and flowers of the same plant. The high intra-plant variation in sugar composition exhibited by field plants vanished in the glasshouse, where nectar composition emerged as a remarkably constant feature across plants, flowers and nectaries. Conclusions In addition to corroborating the results of previous studies documenting extreme intra-plant variation in nectar sugar composition in the field, this study suggests that such variation may ultimately be caused by biotic factors operating on the nectar in the field but not in the glasshouse. Pollinator visitation and pollinator-borne yeasts are suggested as likely causal agents.
Description: 8 páginas, figuras, tablas
Publisher version (URL): http://dx.doi.org/10.1093/aob/mcl291
URI: http://hdl.handle.net/10261/36114
ISSN: 0305-7364
DOI: 10.1093/aob/mcl291
E-ISSN: 1095-8290
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