Results 171 to 180 of about 29,000 (204)

NMR-Based Metabolic Profiling ofAnigozanthosFloral Nectar

Journal of Natural Products, 2008
Nuclear magnetic resonance spectroscopic methods have been used to characterize the chemical composition of floral nectar of Anigozanthos species with a minimum of sample preparation and without derivatization. The nectar of this passerine-pollinated plant is largely dominated by glucose and fructose, while sucrose occurs only at a minor level ...
Hölscher, D., Brand, S., Wenzler, M., Schneider, B.   +3 more
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Nectar: properties, floral aspects, and speculations on origin

Trends in Plant Science, 2004
Although nectar is crucial for most pollinators, its evolutionary origin has received scant attention. Nectar is derived from the phloem solution. Both have high sugar concentrations (usually 10-30% solutes by fresh mass); the main solute in the phloem is sucrose, whereas nectar can also contain considerable amounts of fructose and glucose. The phloem,
Erick, De la Barrera, Park S, Nobel
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Does acoustic priming ‘sweeten the pot’ of floral nectar?

Ecology Letters, 2020
AbstractA recent claim that evening primrose flowers adaptively secrete nectar in response to vibrations from hovering bees lacks supporting evidence. The authors fail to demonstrate that bees can access the concealed nectar and that their visits enhance plant fitness. Reanalysis of the authors’ data raises additional concerns about their conclusions.
Robert A. Raguso, Lawrence D. Harder, Steven D. Johnson   +2 more
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WHY ARE SOME FLORAL NECTARS SCENTED?

Ecology, 2004
Despite recent interest in the non-sugar components of floral nectar, nearly nothing is known about the ecological importance and phylogenetic distribution of scented nectar. If present, the scent of nectar would provide an honest signal to nectar-feeding animals.
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Floral Nectar: Pollinator Attraction or Manipulation?

Trends in Ecology & Evolution, 2016
The literature suggests that floral nectar acts principally to attract pollinator visitation (and/or revisitation), thereby enhancing plant reproductive success. However, floral nectar also manipulates pollinator behaviour during and immediately following plant visits, affecting pollen transfer, and plant reproduction. I argue that floral nectar should
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A novel role for proline in plant floral nectars

Naturwissenschaften, 2006
Plants offer metabolically rich floral nectar to attract visiting pollinators. The composition of nectar includes not only sugars, but also amino acids. We have examined the amino acid content of the nectar of ornamental tobacco and found that it is extremely rich (2 mM) in proline.
Clay, Carter, Sharoni, Shafir, Lia, Yehonatan, Reid G, Palmer, Robert, Thornburg   +4 more
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Floral nectar chemical composition of some species from Patagonia

Biochemical Systematics and Ecology, 1997
Abstract Floral nectar chemical compositions of 28 species native to Argentinian Patagonia are reported. Most data obtained are new reports at the generic and/or the specific level. Nectars of these species show high mean concentrations (42.35±15.56; %, wt/total wt of solution).
Gabriel Bernardello, Leonardo Galetto, Alicia Forcone   +2 more
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Intraspecific Constancy of Floral Nectar Amino Acid Complements

Botanical Gazette, 1977
Amino acid complements of nectars from a wide range of angiosperms were examined for intraspecific variation, using a dansylation technique and "miniaturized" polyamide thin-layer chromatography In the face of outcrossing mechanisms, environmental variation, and even fungal attack, there is impressive constancy of the complements on a "presence or ...
Herbert G. Baker, Irene Baker
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Variation in the Concentration of Floral Nectars

Journal of Economic Entomology, 1930
A preliminary report on the extent to which variation has been found in the concentration of floral nectars.
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Nectar extraction by hummingbirds: response to different floral characters

Oecologia, 1984
Handling times of hummingbirds (Amazilia rutila and Cynanthus latirostris) visiting artificial flowers were a positive function of corolla length, nectar volume and nectar concentration. Corolla angle had no consistent effects on handling times. A multiple regression model explained 83% of the variation in handling times for these two species.
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